Rivers in Yellowstone National Park

Yellowstone National Park is a major headwater region in the western United States, giving rise to hundreds of rivers and streams that flow across the Rocky Mountains. The park contains more than 400 miles of rivers and streams, many of which eventually drain into both the Pacific Ocean and the Gulf of Mexico. This unique hydrological system exists because the Continental Divide passes directly through Yellowstone National Park, dividing the flow of water into different drainage basins.

Rivers flowing north and east ultimately reach the Gulf of Mexico and Atlantic watershed through the Missouri River system, while rivers flowing south and west drain toward the Pacific Ocean through the Snake River and Columbia River basin.

Quick Reference: Yellowstone National Park Rivers

River / Creek	Origin	Course & Confluence	Length within park	Key Features & Significance
Yellowstone River	Absaroka Range, Yellowstone NP	Flows through Yellowstone Lake, Grand Canyon of the Yellowstone; joins Missouri River in North Dakota	~100 miles	Oldest undammed major river in the U.S.; forms Upper & Lower Falls; rich wildlife, fishing, rafting
Lamar River	Absaroka Range (NE Yellowstone)	Flows through Lamar Valley; joins Yellowstone River	~44 miles	Prime wildlife corridor; wolves, bison, elk; major Yellowstone tributary
Gardner River	Gallatin Range	Flows through Gardiner Canyon; joins Yellowstone River near Mammoth	~25 miles	Boiling River mixing zone; fishing; historic northern gateway
Snake River	Absaroka Range (SE Yellowstone)	Flows south into Grand Teton NP; part of Columbia River system	~15 miles	Vital southern wetlands; supports moose, elk, birds
Gibbon River	Norris Geyser Basin	Flows southeast; joins Firehole River to form Madison River	~25 miles	Geothermal influence; Gibbon Falls; fishing
Firehole River	Madison Lake area	Flows north; joins Gibbon River at Madison Junction	~21 miles	Strong geothermal heating; Firehole Falls; swimming & fishing
Madison River	Gibbon + Firehole Rivers	Flows west into Montana; joins Missouri River system	~19 miles	World-famous trout fishery; historic birthplace of national park idea
Bechler River	Bechler Meadows (SW Yellowstone)	Flows southwest; joins Fall River	~17 miles	“Cascade Corner”; waterfalls; hot springs; remote wilderness
Lewis River	Lewis Lake	Flows north; joins Snake River	~18 miles	Lewis Falls; scenic fishing; lake-river system
Gallatin River	Gallatin Range (NW Yellowstone)	Flows north; joins Madison & Jefferson Rivers	~23 miles	Gallatin Canyon; rafting; cultural & historical importance
Heart River	Continental Divide near Heart Lake	Flows south; joins Snake River	~4.8 miles	Short, steep course; gorge terrain
Slough Creek	Absaroka Mountains	Flows east; joins Lamar River	~25 miles	Renowned wild trout fishery; scenic meadows
Soda Butte Creek	Absaroka Range near Cooke City	Flows west; joins Lamar River	~20 miles	Parallels NE Entrance Road; fly-fishing hotspot
Iron Spring Creek	Highlands near Absaroka Range	Flows east; joins larger park streams	~5 mile	Rugged terrain; minor but scenic tributary

Yellowstone River in Yellowstone National Park

The Yellowstone River is one of the major rivers in the United States, flowing through Yellowstone National Park before continuing across Montana and into North Dakota, where it eventually joins the Missouri River. The river is approximately 692 miles (1,114 km) long and is an important part of the Greater Yellowstone Ecosystem, supporting diverse landscapes, wildlife, and recreational activities.

Yellowstone River in Yellowstone National Park

The Yellowstone River originates in the Absaroka Range in the southeastern part of the park. Within Yellowstone National Park, the river flows mainly northward for nearly 100 miles (160 km) through forests, valleys, canyons, and geothermal landscapes. Its course inside the park is commonly divided into three major sections.

Upper Section (Thorofare to Yellowstone Lake)

In the remote Thorofare wilderness, mountain streams merge to form the upper Yellowstone River. The river then flows through wetlands and dense forests before spreading into a broad delta at the southern end of Yellowstone Lake. This isolated region is known for its pristine scenery and abundant wildlife habitats.

Middle Section (Yellowstone Lake to the Grand Canyon)

The river exits Yellowstone Lake at Fishing Bridge and flows northward through the wide grasslands of Hayden Valley. In this area, the slow-moving river creates ideal habitat for bison, elk, moose, and waterfowl. The surrounding riparian zones and meadows also support black bears and numerous bird species, including eagles and ospreys.

Farther downstream, the Yellowstone River dramatically plunges over the Upper Yellowstone Falls and the larger Lower Yellowstone Falls. Together, these waterfalls drop about 422 feet (129 meters) into the spectacular Grand Canyon of the Yellowstone, famous for its colorful volcanic cliffs and breathtaking scenery. Several hiking trails follow this section of the river and lead to scenic overlooks of the canyon and waterfalls. These trails provide excellent opportunities for sightseeing, photography, and wildlife observation.

Lower Section (Tower Junction to Gardiner)

After leaving the canyon region, the Yellowstone River rushes through the rugged Black Canyon of the Yellowstone. Near Tower Junction, it is joined by the Lamar River, one of its major tributaries within the park. The river then continues northwest past Mammoth Hot Springs before exiting the park at Gardiner and entering Montana’s Paradise Valley.

The Yellowstone River is also a major destination for recreation. Anglers visit the river for its populations of cutthroat, rainbow, and brown trout, while sections downstream of the park attract rafting and kayaking enthusiasts because of their rapids and fast-moving waters. Campgrounds located near the river within and around the park provide convenient access to fishing, hiking, boating, and wildlife viewing opportunities.

Yellowstone River in Yellowstone National Park

Lamar River in Yellowstone National Park

The Lamar River is a 44-mile-long (71 km) tributary of the Yellowstone River that flows entirely within Yellowstone National Park. It is the park’s largest internal tributary and one of Yellowstone’s most important wildlife and fishing rivers. Originating in the rugged Absaroka-Beartooth Mountains near the park’s eastern boundary, the river flows generally northwest through valleys, meadows, and canyons before joining the Yellowstone River near Tower Junction.

Lamar River in Yellowstone National Park

The course of the Lamar River can be divided into three major sections.

Backcountry Headwaters (Upper Course)

The Lamar River begins high in the mountainous wilderness of the Absaroka-Beartooth region. In its upper course, the river flows rapidly through steep alpine terrain and narrow backcountry canyons surrounded by forests and rocky slopes. This isolated section has a wild and undeveloped character, with cold, fast-moving water fed by snowmelt and mountain streams. Along this upper stretch, the river receives important tributaries such as Cache Creek.

Lamar Valley (Middle Course)

After leaving the confined mountain canyons, the river enters the broad and open Lamar Valley. Here, the river changes dramatically from a swift mountain stream into a slower, meandering meadow river flowing across wide grasslands. This middle section is the most accessible part of the river because it closely follows the park’s Northeast Entrance Road.

As the river winds through the valley floor, it is joined by important tributaries including Soda Butte Creek and Slough Creek. The fertile meadows and riparian habitats surrounding the river support abundant wildlife, making Lamar Valley one of the best wildlife-viewing areas in Yellowstone. Large herds of bison are commonly seen grazing near the river, while wolves, grizzly bears, elk, pronghorn, and moose also inhabit the valley. The area is also known for its wolf populations, and sightings of wolves are relatively common in the Lamar Valley. Because of this remarkable concentration of wildlife, the valley is often called the “Serengeti of North America.”

The Lamar River is also internationally known for fly fishing and contains healthy populations of native Yellowstone cutthroat trout. Fishing conditions usually improve after the spring runoff subsides in mid-July.

Canyons and Confluence (Lower Course)

After leaving the open plains of Lamar Valley, the river flows away from the main road and enters a series of rocky, boulder-filled canyons. In this lower course, the river becomes faster and more confined as it cuts through rugged terrain on its approach to the Yellowstone River.

The Lamar River finally reaches its confluence with the Yellowstone River just north of Tower Junction and downstream from the Grand Canyon of the Yellowstone. This confluence marks the end of one of Yellowstone’s most scenic and ecologically important river systems.

Gardner River in Yellowstone National Park

The Gardner River is a 25-mile-long tributary of the Yellowstone River located entirely within the northwestern region of Yellowstone National Park. The river follows a dramatic horseshoe-shaped course around the Mammoth Hot Springs area and drops nearly 4,500 feet (1,370 meters) from its mountain headwaters to its confluence with the Yellowstone River. Along its journey, the Gardner River changes from a quiet alpine stream into a powerful canyon river flowing through waterfalls, geothermal zones, and rugged basalt gorges.

Gardner River in Yellowstone National Park

Headwaters and Gardner’s Hole

The Gardner River originates on the high slopes of Joseph Peak in the Gallatin Range at an elevation of nearly 10,000 feet. From its mountainous source, the young river descends into the broad subalpine basin known as Gardner’s Hole. In this upper section, the river flows southward through meadows and forested valleys, closely paralleling the Norris-to-Mammoth road near Indian Creek Campground.

As it travels through this basin, the river gains water from several important tributaries, including Fawn Creek, Panther Creek, Indian Creek, and Obsidian Creek. The upper Gardner River is also a well-known trout fishery, attracting anglers seeking brook, rainbow, and brown trout in its cold mountain waters.

Sheepeater Canyon and Osprey Falls

Near the southern flank of Bunsen Peak, the Gardner River abruptly changes direction and turns sharply northeastward. The river then cuts into the dramatic Sheepeater Canyon, a deep volcanic gorge lined with towering basalt cliffs.

Within this canyon lies one of the river’s most spectacular features, Osprey Falls, where the Gardner River plunges nearly 150 feet into the canyon below. The waterfall is accessible by hiking trails connected to the Bunsen Peak area and is considered one of Yellowstone’s hidden scenic attractions.

Lower Canyon and Geothermal Influence

After emerging from Sheepeater Canyon, the Gardner River flows northward through a steep, deeply carved canyon alongside the North Entrance Road. In this lower section, the river becomes faster and more turbulent, with numerous rapids and pocket-water channels.

Near Mammoth Hot Springs, the river passes the famous Boiling River geothermal area. Here, large volumes of extremely hot thermal water flow directly into the cold river, significantly changing the river’s temperature and mineral composition. This unique geothermal mixing area was historically a popular soaking location within the park.

The Gardner River canyon also serves as an important wildlife corridor, particularly for Yellowstone’s northern elk herds and other animals moving between valleys and mountain habitats.

Confluence at Gardiner

In its final stretch, the river flows beneath the 45th Parallel bridge and descends through steep rapids before leaving the park boundary at Gardiner. Immediately outside the park, near the historic Roosevelt Arch, the Gardner River empties into the Yellowstone River, completing one of the most geologically diverse and scenic river courses in Yellowstone National Park.

Snake River in Yellowstone National Park

The Snake River is one of the major rivers of the western United States, eventually flowing more than 1,000 miles (1,600 km) through Wyoming, Idaho, Oregon, and Washington before joining the Columbia River.

The Snake River flows for approximately 15 miles (24 km) within Yellowstone National Park, crossing a remote and rugged landscape in the park’s extreme southeastern corner. This entire stretch lies deep within Yellowstone’s backcountry and remains completely untouched by roads, making it one of the park’s most isolated river systems.

Snake River in Yellowstone National Park

The Snake River begins its journey on the Two Ocean Plateau just south of the Yellowstone boundary within the Teton Wilderness. From its high-elevation headwaters, the river flows northwest into the southeastern corner of Yellowstone National Park through a broad glaciated valley surrounded by forests, wetlands, and volcanic terrain.

After flowing northwest for a short distance, the river makes a sharp southward bend and continues through remote wilderness landscapes. Along this stretch, the Snake River receives water from several important backcountry tributaries that strengthen its flow before it leaves the park.

One of its major tributaries is the Heart River, which enters from the north after draining Heart Lake and the surrounding geothermal basin. Farther downstream, the Lewis River joins the Snake River near the park boundary, carrying water from Lewis Lake and Shoshone Lake.

As the river winds across Yellowstone’s volcanic plateau, it passes geothermal areas including the Snake River Hot Springs, where warm mineral-rich thermal waters enter the cold river current. These geothermal influences contribute to the unique ecological and chemical characteristics of the river’s headwaters.

Snake River in Yellowstone National Park

The Snake River then flows southward past Yellowstone’s South Entrance, roughly paralleling the South Entrance Road before leaving the park and entering the John D. Rockefeller, Jr. Memorial Parkway. From there, the river continues toward Grand Teton National Park, eventually feeding into Jackson Lake as it begins its long 1,000-mile journey across the American West.

The remote upper Snake River is highly valued for backcountry recreation and wilderness fly fishing. Because access requires hiking through undeveloped terrain, fishing pressure remains low compared to Yellowstone’s roadside rivers. Anglers visit the area to catch native Snake River fine-spotted cutthroat trout in pristine mountain waters.

Gibbon River in Yellowstone National Park

The Gibbon River is a 25-mile-long river flowing through the central-western region of Yellowstone National Park. It serves as one of the park’s major drainage systems for the Yellowstone hydrothermal plateau before joining the Firehole River at Madison Junction to form the Madison River, an important tributary of the Missouri River.

The Gibbon River is known for its scenic waterfalls, geothermal influences, forested canyons, and productive trout fisheries. Much of the river closely parallels Yellowstone’s Grand Loop Road, making it one of the park’s most accessible rivers for sightseeing, fishing, and photography.

Gibbon River in Yellowstone National Park

Headwaters and Upper Section

The Gibbon River originates at Grebe Lake on Yellowstone’s central plateau. From its source, the river flows generally westward through a landscape of high-elevation meadows, wetlands, and dense lodgepole pine forests. In its upper course, the river passes through Wolf Lake and Ice Lake before descending toward the geothermal regions of central Yellowstone. This upper stretch is quieter and less developed, supporting wildlife habitats for elk, birds, and other forest species.

Mid-Section and Thermal Plateau

As the river continues downstream, it enters a steeper and more rugged landscape near Virginia Cascades. Here, the river plunges through a narrow canyon in a series of scenic cascades and rapids surrounded by volcanic rock formations.

Farther downstream, the Gibbon River flows near the famous Norris Geyser Basin, one of the hottest and most dynamic geothermal regions in Yellowstone. In this area, hot and highly acidic geothermal runoff enters the river, significantly influencing its water chemistry and temperature.

The river also passes close to the colorful thermal area known as Artist Paint Pots, where bubbling mud pots, hot springs, and fumaroles reflect Yellowstone’s volcanic activity.

Gibbon Canyon and Gibbon Falls

Below the thermal plateau, the river enters Gibbon Canyon, where it closely parallels the Grand Loop Road for much of its lower course. This canyon section is one of the most accessible stretches of the river and provides excellent roadside scenery and fishing access.

One of the river’s most famous features is Gibbon Falls, where the river plunges approximately 84 feet over the remnant rim of the ancient Yellowstone Caldera. The waterfall is a major scenic stop within the park and offers panoramic views of the surrounding canyon. Below the falls, the river slows and spreads across open meadows that are frequently visited by elk and bison. These lower meadows create important riparian habitats and provide picturesque landscapes for wildlife viewing.

Confluence at Madison Junction

The Gibbon River ends at Madison Junction, where it merges directly with the Firehole River. The confluence of these two rivers forms the Madison River, which then flows westward and eventually becomes part of the Missouri-Mississippi River system flowing toward the Gulf of Mexico.

Gibbon River in Yellowstone National Park

Firehole River in Yellowstone National Park

The Firehole River is a 21-mile-long (34 km) river that flows entirely within the western portion of Yellowstone National Park. It is one of Yellowstone’s most distinctive rivers because it flows through three of the park’s major geothermal basins (Upper Geyser Basin, Midway Geyser Basin and Lower Geyser Basin) and receives direct runoff from geysers, hot springs, and thermal pools. As a result, the Firehole River transforms from a cold mountain stream into a geothermally heated river system unlike any other in North America. The river is renowned for its thermal landscapes, world-class fly fishing, wildlife viewing, scenic drives, and recreational opportunities.

Firehole River in Yellowstone National Park

Headwaters and Upper Course

The Firehole River begins at Madison Lake, a small lake situated at an elevation of approximately 8,200 feet near the Continental Divide. In its uppermost reaches, the river is a cool, clear mountain stream flowing northward through forests and volcanic terrain. Shortly downstream, the river encounters its first significant geothermal influence near the Lone Star Geyser Basin. Here, thermal waters begin entering the river, gradually increasing its temperature and mineral content.

Upper Geyser Basin and Old Faithful

Continuing north, the Firehole River flows directly through the famous Upper Geyser Basin, home to the world-renowned Old Faithful. Hundreds of geysers, hot springs, and thermal features surround the river in this section. Hydrothermal runoff from these geothermal features significantly alters the river's chemistry and temperature. As warm mineral-rich water enters the channel, the Firehole River begins developing the unique characteristics that distinguish it from typical mountain rivers.

Midway and Lower Geyser Basins

The river continues north through the heart of Yellowstone’s thermal landscape, passing the spectacular Midway Geyser Basin. In this area, runoff from the famous Grand Prismatic Spring enters the river, adding large volumes of hot water and dissolved minerals.

Farther downstream, the Firehole flows through the expansive Lower Geyser Basin. By this stage, the river has become noticeably warmer than most rivers in the Rocky Mountains, creating a unique aquatic ecosystem influenced by geothermal activity. The riverbanks in this area are often frequented by bison, elk, and occasionally bears, making it an excellent wildlife-viewing corridor.

The river also flows near popular geothermal attractions and scenic viewpoints, while much of its course parallels Yellowstone’s Grand Loop Road, providing easy visitor access.

Firehole Canyon and Firehole Falls

After leaving the broad thermal basins, the river undergoes a dramatic change in character. It narrows and descends into the rugged Firehole Canyon, a deep gorge carved into volcanic rock. Within the canyon, the river plunges over the scenic Firehole Falls, a waterfall approximately 40 feet high. The canyon is accessible via the scenic Firehole Canyon Drive, one of Yellowstone’s most popular short drives.

Just downstream from the falls lies the designated Firehole Canyon Swimming Area, one of the few locations in Yellowstone where swimming has traditionally been permitted during suitable conditions. Seasonal closures may occur because of strong currents, high runoff, or safety concerns.

Confluence at Madison Junction

The Firehole River ends at Madison Junction, where it merges with the Gibbon River. This confluence forms the Madison River, which flows westward out of Yellowstone and eventually becomes part of the Missouri-Mississippi River system draining into the Gulf of Mexico.

Despite its unusually warm, mineral-rich waters, the Firehole River supports healthy populations of rainbow, brown, and brook trout and is widely regarded as one of Yellowstone’s most famous fly-fishing destinations. Nearby facilities such as the Firehole River Picnic Area provide visitors with scenic river views, picnic facilities, and convenient access to one of the park’s most remarkable waterways.

Madison River in Yellowstone National Park

The Madison River flows approximately 19 miles (31 km) through Yellowstone National Park before crossing into Montana. Although relatively short within the park, it is one of Yellowstone’s most important rivers, carrying water from the geothermal heart of the park toward the Missouri River drainage basin. The river follows a generally westward course through forests, canyons, and wildlife-rich meadows before leaving Yellowstone at the West Entrance.

Madison River in Yellowstone National Park

Origin at Madison Junction

The Madison River begins at Madison Junction, where the warm, geothermal waters of the Firehole River merge with the cooler Gibbon River. This confluence creates the Madison River and marks the starting point of a waterway that will eventually become part of the Missouri-Mississippi River system. Just north of the junction lies Terrace Springs, a small geothermal area whose thermal features reflect the volcanic forces that influence much of the Madison watershed.

Upper Course: Madison Canyon

From Madison Junction, the river flows westward through the narrow and forested Madison Canyon. In this section, the river is bordered by dense lodgepole pine forests and volcanic terrain shaped by Yellowstone's geologic history. As it winds through the canyon, the river passes beneath National Park Mountain on the north side of the valley. Farther downstream, the canyon scenery is framed by prominent peaks such as Mount Haynes and Purple Mountain, which rise dramatically above the river corridor.

Middle Course: Madison Valley

Beyond the canyon, the river enters the broader Madison Valley, where the landscape opens into expansive meadows and wetlands. Here, the Madison River slows slightly and meanders through one of Yellowstone’s most productive wildlife habitats.

Large herds of bison and elk are commonly seen grazing near the riverbanks, while bald eagles and other birds frequently use the riparian corridor. This section is particularly popular among wildlife photographers because of its open views and abundant animal activity. One of the most recognized landmarks along the river is the 7-Mile Bridge, a well-known access point for anglers and wildlife watchers. The bridge offers excellent views of the river and surrounding valley scenery.

Lower Course and Exit from Yellowstone

Continuing westward, the Madison River follows the route of the West Entrance Road toward the park boundary. This final stretch provides some of Yellowstone’s most scenic river views, with forested slopes, open meadows, and mountain backdrops lining the waterway. The river eventually leaves Yellowstone National Park near the West Yellowstone Entrance Station and enters Montana. From there, it continues through the famous Madison Valley before eventually joining the Missouri River system.

Recreation and Fishing

The Madison River is internationally renowned as a fly-fishing destination and is considered one of the premier trout streams in North America. Within Yellowstone National Park, the entire 19-mile section is managed as a wade-fishing-only river. Healthy populations of brown and rainbow trout inhabit the river, while seasonal hatches of caddisflies and Pale Morning Duns attract anglers throughout the summer.

During autumn, large brown and rainbow trout migrate upstream from Hebgen Lake, creating some of the best fishing opportunities of the year. The nearby Madison Campground provides convenient access to the river, while the Grand Loop Road and West Entrance Road offer scenic driving routes that closely follow much of the Madison River’s course.

Bechler River in Yellowstone National Park

The Bechler River originates in the Bechler Meadows in the southwestern corner of Yellowstone National Park, near the park’s boundary with Idaho. It flows southwest through the Bechler region before eventually joining the Fall River, which continues into Idaho. The river’s course is about 17.4 miles long, and it is one of the least visited areas in Yellowstone due to its remote location.

The Bechler River area is often called "Cascade Corner" because of the numerous waterfalls that grace the river and its tributaries. This region has one of the highest concentrations of waterfalls in the park, making it a paradise for waterfall enthusiasts. The waterfalls range from small cascades to larger falls, creating a scenic and dynamic landscape.

Bechler River in Yellowstone National Park

Headwaters at Three Rivers Junction

The Bechler River officially begins at Three Rivers Junction, located southwest of Shoshone Lake. Here, three mountain streams converge to form the river. The first two tributaries, Phillips Fork and Gregg Fork, descend southward from the slopes of Trischman Knob and the Madison Plateau. The third tributary, Ferris Fork, flows northwest from the Pitchstone Plateau and carries runoff from geothermal areas, including the popular backcountry hot spring known as Mr. Bubbles.

Upper Course: Bechler Canyon

After leaving Three Rivers Junction, the Bechler River flows southwest into the rugged Bechler Canyon. In this upper section, the river descends rapidly through a steep volcanic landscape, carving a dramatic canyon surrounded by forests and backcountry wilderness.

This portion of the river contains some of Yellowstone’s most impressive waterfalls. As the river plunges over volcanic rock shelves, it creates a series of spectacular cascades, including Twister Falls, Iris Falls, and the magnificent Colonnade Falls, a dramatic two-tiered waterfall often regarded as one of the most beautiful cascades in Yellowstone. The abundance of waterfalls throughout this canyon is the reason the southwestern region of the park is commonly known as "Cascade Corner."

Lower Course: Bechler Meadows

After emerging from the canyon, the river enters the broad wetlands and grasslands of Bechler Meadows. Here, the river's character changes dramatically. The steep canyon gradients give way to a low-gradient landscape where the river slows and begins meandering through open meadows, willow-lined banks, and deep pools. Additional tributaries, including Ouzel Creek and Boundary Creek, join the river in this lower section, increasing its flow before it reaches its final destination.

This meadow stretch is particularly popular among fly-fishing enthusiasts seeking rainbow trout, Yellowstone cutthroat trout, and cutbow trout. The quiet backcountry setting and limited visitor access make it one of Yellowstone’s most secluded fishing destinations.

Confluence with the Fall River

Near the historic Bechler Ranger Station, the Bechler River reaches the end of its journey and empties into the Fall River just upstream of Cave Falls. Through the Fall River system, its waters ultimately become part of the Snake River basin, flowing toward the Pacific Ocean.

Lewis River in Yellowstone National Park

The Lewis River is an 18.1-mile-long (29 km) tributary of the Snake River located entirely within the southern portion of Yellowstone National Park. Flowing from north to south, the river connects two of Yellowstone’s largest lakes before descending through a dramatic canyon and joining the Snake River near the park’s South Entrance. The Lewis River is renowned for its scenic waterfalls, trout fishing opportunities, boating access, wildlife habitat, and spectacular canyon scenery.

Upper Course: Lewis River Channel

The Lewis River begins at the southern outlet of Shoshone Lake, the largest backcountry lake in Yellowstone National Park. From its source, the river flows southward through a narrow and remote waterway known as the Lewis River Channel. This approximately three-mile stretch is one of the most popular fishing areas in the Yellowstone backcountry. The channel is particularly famous for seasonal migrations of large brown trout and lake trout moving between Shoshone Lake and Lewis Lake. It is also the only section of the Lewis River where non-motorized boating, such as kayaking and canoeing, is permitted.

Middle Course: Lewis Lake

The river then flows directly into the northern end of Lewis Lake, temporarily losing its identity as a distinct stream as its waters spread across the lake basin. Lewis Lake serves as an important recreational hub within the southern portion of Yellowstone. Unlike most Yellowstone lakes, it permits motorized boating as well as kayaking and canoeing. The nearby South Entrance Road begins paralleling the river-lake system in this area, providing visitors with convenient access and scenic views.

Lower Course: Lewis Falls and Lewis Canyon

The Lewis River re-emerges from the southern outlet of Lewis Lake and continues its journey southward. Almost immediately after leaving the lake, it plunges over the scenic Lewis Falls, a picturesque 30-foot waterfall located adjacent to the South Entrance Road. Lewis Falls is one of Yellowstone’s most accessible waterfalls and is a popular stop for visitors traveling between Yellowstone and Grand Teton National Park. The falls mark the beginning of the river’s most dramatic section.

Below the waterfall, the river enters the rugged Lewis Canyon, where it carves through a deep and steep-sided gorge. This canyon section is largely inaccessible, limiting opportunities for hiking and fishing but creating impressive scenery characterized by fast-moving water, rocky cliffs, and dense forested slopes. The river corridor also supports diverse wildlife. Birdwatchers frequently visit the area in search of the American Dipper, North America's only truly aquatic songbird, which can often be seen foraging along the river's rocky edges.

Confluence with the Snake River

Near Yellowstone’s southern boundary, the Lewis River emerges from its canyon and reaches its confluence with the Snake River. The joining of these two rivers contributes additional flow to the Snake River system and helps direct its course southward toward Grand Teton National Park and the broader Columbia River watershed.

Gallatin River in Yellowstone National Park

The Gallatin River originates in the northwestern corner of Yellowstone National Park, where streams descending from the high peaks of the Gallatin Range converge to form the river. From its remote headwaters, the Gallatin River flows northward for approximately 120 miles (193 km) through mountain valleys, meadows, and canyons before joining the Madison River and Jefferson River near Three Forks to form the Missouri River. 

Within Yellowstone National Park, the river travels about 23 miles through remote alpine landscapes, broad meadows, and forested valleys, making its upper reaches among the wildest and least-visited river corridors in the park.

Gallatin River in Yellowstone National Park

Headwaters and Upper Segment

The Gallatin River begins at Gallatin Lake, a high-elevation alpine cirque lake located on the western flank of Three Rivers Peak in the Gallatin Range. Emerging from this mountainous source, the young river descends rapidly through steep terrain, forming a cold, clear alpine stream fed by snowmelt and mountain runoff.

During its first several miles, the river flows through narrow valleys, forested slopes, and small high-elevation meadows. This remote headwater region provides important habitat for wildlife and supports a healthy mountain ecosystem. Much of the upper six miles lies within a designated Bear Management Area, where off-trail travel and recreational access are restricted to protect both wildlife and visitors.

Fawn Meadows and Highway Corridor

Farther downstream, near the Fawn Pass Trailhead, the Gallatin River emerges from the confined mountain valleys and enters a broader landscape. Here, the river begins flowing through the willow-lined grasslands of Fawn Meadows, one of the most scenic meadow systems in Yellowstone's northwestern corner.

In this lower section, the river slows and meanders across expansive flats bordered by forests and wetlands. The river closely parallels U.S. Highway 191, providing travelers with excellent views of the river corridor and surrounding mountains. Wildlife such as elk, moose, bears, and waterfowl are frequently observed in these meadows.

Exit from Yellowstone

Continuing northwest, the Gallatin River follows the broad valley alongside Highway 191 until it reaches the northwestern boundary of Yellowstone National Park. The river then enters the Gallatin National Forest and continues toward Big Sky, Montana.

Beyond Yellowstone, the river enters the spectacular Gallatin Canyon, where it cuts through steep mountain terrain and creates some of the finest whitewater rafting opportunities in the region. One of its most famous stretches is the Class IV rapid section known as the “Mad Mile,” a popular destination for experienced rafters.

Confluence at Three Forks

After leaving the canyon and crossing the Gallatin Valley, the river continues northward until reaching Three Forks. Here, it joins the Madison and Jefferson rivers to form the Missouri River, one of the longest river systems in North America. This confluence marks the end of the Gallatin River’s journey from the mountains of Yellowstone to the Great Plains.

Heart River in Yellowstone National Park

The Heart River is a remote tributary of the Snake River located entirely within Yellowstone National Park, flowing for 4.8 miles (7.7 kilometers). Rising on the Continental Divide in the Rocky Mountains, it starts a few miles southeast of Yellowstone Lake. The river's headwater streams converge into Heart Lake, and from the southeastern end of the lake, the Heart River begins its journey.

Headwaters and Heart Lake

The river's journey begins on the Continental Divide, southeast of Yellowstone Lake. Multiple small, high-altitude headwater streams flow down from the divide and empty directly into Heart Lake.

The Main Stem and Upper Course

The formal main stem of the Heart River begins at the southeastern outlet of Heart Lake. Shortly after leaving the lake, the river gains additional flow from tributaries including Surprise Creek and Outlet Creek, which enter from the northeast. This upper section contains cold, clear water that supports populations of native Yellowstone cutthroat trout. The river is especially valued by anglers seeking a remote wilderness fishing experience, although strict catch-and-release regulations help protect the native fish population.

Gorge and Southern Descent

After departing the Heart Lake basin, the river turns southwest and enters a short but steep gorge carved through volcanic terrain. Upon leaving the canyon, it gradually resumes a generally southward course through a broad and isolated valley. Along this section, the river flows between the rugged Red Mountains to the west and Big Game Ridge to the east. The surrounding landscape consists of forests, meadows, wetlands, and wildlife-rich habitats that receive relatively few visitors compared to Yellowstone's more accessible regions.

Confluence with the Snake River

The Heart River completes its journey by flowing into the Snake River near Yellowstone's southern boundary, just north of Bridger-Teton National Forest. The confluence lies within a broad alpine meadow surrounded by mountains and wilderness. Once its waters enter the Snake River, they continue south through Wyoming and Idaho before eventually reaching the Columbia River System and ultimately the Pacific Ocean.

Slough Creek in Yellowstone National Park

The Slough Creek is a renowned tributary of the Lamar River that flows through the remote northeastern corner of Yellowstone National Park. Originating in the high mountains of southern Montana, the creek follows a winding 25-mile course through alpine forests, broad meadows, and narrow canyons before joining the Lamar River near the Tower area. Slough Creek is particularly famous for its exceptional fly fishing and its remarkable transition from a fast-flowing mountain stream to a slow, meandering meadow creek.

Slough Creek in Yellowstone National Park

Headwaters and Park Entry

The journey of Slough Creek begins in the high elevations of the Absaroka-Beartooth Wilderness within the Beartooth Mountains. Here, snowmelt-fed streams descending from the surrounding peaks merge to form the creek. Flowing southwest, the young stream crosses the Montana-Wyoming border and enters Yellowstone National Park. In this upper section, Slough Creek descends through dense conifer forests and steep mountain terrain. The gradient is relatively steep, producing a cold, swift current that contrasts sharply with the slower waters found farther downstream.

The Upper Meadows

After leaving the mountain valleys, the creek reaches a broad valley floor where its character changes dramatically. The gradient decreases, the current slows, and the stream begins forming graceful meanders and oxbows across a series of famous mountain meadows.

The most remote section is the Third Meadow, located closest to the park boundary. Here, the creek winds through expansive grasslands and deep pools with very little human activity, creating one of Yellowstone's premier backcountry fishing destinations.

Continuing downstream, Slough Creek enters the Second Meadow, where it flows through a wide valley bordered by surrounding mountains, including Cutoff Mountain and Sugarloaf Mountain. This section is known for its broad meanders, undercut banks, and abundant wildlife habitat.

Farther south, the creek reaches the First Meadow, one of the most visited sections of the watershed. Here, the water slows considerably as it winds across a broad gravel and sand basin. The meadow contains a historic National Park Service patrol cabin and serves as a gateway for hikers and anglers exploring the upper watershed.

Canyon Section and Campground Area

Leaving the First Meadow, Slough Creek briefly enters a narrow, rocky canyon where the stream becomes faster and more turbulent. Within this confined section, the creek flows over the small but scenic Slough Creek Falls before emerging back into a wider valley. The creek then passes the Slough Creek Campground, one of Yellowstone's most popular campgrounds for anglers and wildlife enthusiasts. Near this area, it receives additional flow from Buffalo Creek, an important tributary entering from the north.

Lower Meadow and Confluence

Downstream of the campground, Slough Creek enters its final meadow section, often referred to as Little America Meadows. Here, the stream once again becomes a slow-moving, winding waterway characterized by broad bends, grassy banks, and productive trout habitat. The creek eventually reaches its confluence with the Lamar River at a location known among anglers as the VIP Pool. This marks the end of Slough Creek's journey. From this point, its waters continue westward through the Lamar River before joining the Yellowstone River, the longest free-flowing river in the contiguous United States.

Slough Creek in Yellowstone National Park

Soda Butte Creek in Yellowstone National Park

The Soda Butte Creek is a major tributary of the Lamar River located in the northeastern corner of Yellowstone National Park. Stretching approximately 20 miles (32 km), the creek originates near Cooke City and flows southwest through alpine valleys, mountain canyons, and the famous Lamar Valley before joining the Lamar River. Named after the distinctive Soda Butte, a dormant geyser cone located near its mouth, the creek is renowned for its scenic beauty, native Yellowstone cutthroat trout fishery, abundant wildlife, and successful environmental restoration.

Soda Butte Creek in Yellowstone National Park

Headwaters and Origin

Soda Butte Creek begins on the southern slopes of the Absaroka Range near an elevation of about 8,000 feet (2,438 m), just outside Yellowstone's northeastern boundary. The creek forms from snowmelt and mountain runoff in the high alpine country surrounding Cooke City. In its uppermost reaches, the creek is a cold, fast-flowing mountain stream that descends through a relatively narrow canyon bordered by forests and rugged peaks. This headwater section reflects the wild mountain environment that characterizes much of the Greater Yellowstone Ecosystem.

Upper Course: Entering Yellowstone

The creek enters Yellowstone National Park near the communities of Silver Gate and Cooke City at the park's Northeast Entrance. Once inside the park, it follows a generally southwestward course through increasingly open terrain. Throughout its journey within Yellowstone, the creek is closely paralleled by U.S. Highway 212, commonly known as the Northeast Entrance Road. This easy accessibility makes Soda Butte Creek one of the most popular roadside fishing streams in the park.

As the creek descends from the mountains, the canyon gradually widens and the stream channel becomes broader. Along this stretch, it receives additional water from tributaries such as Pebble Creek and transitions from a steep mountain torrent into a wider gravel-bottom stream.

Lower Course: Lamar Valley

Farther downstream, Soda Butte Creek enters the eastern reaches of the famous Lamar Valley, one of Yellowstone's premier wildlife-viewing destinations. Here, the gradient decreases significantly and the creek begins meandering across broad valley meadows.

This lower section contains deep pools, undercut banks, and winding bends that create ideal habitat for native Yellowstone cutthroat trout. The creek is particularly popular with fly anglers from July through the first autumn frosts, when terrestrial insect patterns such as grasshopper and cricket imitations are especially effective.

The Lamar Valley portion of the creek is also one of the best places in Yellowstone to observe wildlife. Bison frequently graze along the streambanks, while black bears, grizzly bears, wolves, pronghorn, and numerous bird species are regularly seen throughout the watershed.

Soda Butte and Confluence with the Lamar River

Near the end of its journey, the creek flows past the distinctive Soda Butte, a solitary dormant geyser cone that gives the stream its name. This unusual geologic feature stands prominently on the valley floor and serves as one of the area's most recognizable landmarks. Shortly afterward, Soda Butte Creek reaches its confluence with the Lamar River near the Soda Butte-Lamar River Trailhead. From there, its waters continue westward through the Lamar River before eventually joining the Yellowstone River.

Iron Spring Creek in Yellowstone National Park

The Iron Spring Creek is a small but remarkable 5.2-mile-long stream located in the Upper Geyser Basin region of Yellowstone National Park. Although modest in length, the creek is notable for its unique transition from a cold mountain stream into a geothermal drainage channel that receives runoff from some of Yellowstone's most colorful hot springs and geysers. Flowing through the famous Black Sand Basin near Old Faithful, the creek eventually joins the Firehole River system.

Iron Spring Creek in Yellowstone National Park

Headwaters and Upper Course

Iron Spring Creek originates in the forested hills southwest of the Old Faithful area. Fed primarily by mountain snowmelt, the creek begins as a cold, clear stream flowing northeast through a quiet backcountry valley. In its upper reaches, it is joined by its main tributary, the West Fork Iron Spring Creek. This section resembles a typical mountain trout stream, winding through lodgepole pine forests and small meadows before approaching Yellowstone's active geothermal landscape.

Black Sand Basin Corridor

The most famous portion of the creek begins as it enters Black Sand Basin, one of the park's most colorful hydrothermal areas. Here, the character of the stream changes dramatically as it becomes a drainage channel for hot, mineral-rich geothermal water.

Numerous thermal features discharge directly into the creek, including runoff from Sunset Lake and Rainbow Springs. The mixing of hot spring water with the cooler stream creates vivid colors produced by heat-loving microorganisms known as thermophiles.

One of the basin's most famous features is Cliff Geyser, which sits directly on the creek bank and frequently erupts into the flowing water. These geothermal inputs significantly alter the creek's temperature, chemistry, and appearance, making it one of Yellowstone's most distinctive small waterways.

Lower Course and Mouth

After leaving the thermal basin, Iron Spring Creek passes beneath the Grand Loop Road near the Iron Spring Picnic Area, a visitor facility equipped with picnic tables and accessible amenities. The creek then flows through a short stretch of open meadow before reaching its terminus. Rather than flowing directly into the main Firehole River, it empties into the Little Firehole River, which soon joins the larger Firehole River. Through this connection, the waters of Iron Spring Creek ultimately become part of the Madison River and the greater Missouri River watershed.