| Lewis River | |
| River | |
| Country | United States |
|---|---|
| State | Wyoming |
| Source | |
| - location | Shoshone Lake, Yellowstone National Park, Wyoming |
| - coordinates | [1] |
| Mouth | Snake River |
| - location | Yellowstone National Park, Wyoming |
| - coordinates | [1] |
| Length | 18 mi (29 km) [2] |
The Lewis River is an 18.1-mile-long (29.1 km)[2] tributary of the Snake River. The entire course of the river is located within the boundaries of Yellowstone National Park in Wyoming.[3] The river is named for Meriwether Lewis, commander of the Lewis and Clark Expedition.[4]
The Lewis River begins at the southern end of Shoshone Lake and flows southerly approximately 3 miles (5 km) to Lewis Lake. This short stretch of the river is the only portion of the river where boating is permitted. The river reemerges at the southern end of Lewis Lake and flows in a general southerly direction through a steep canyon roughly paralleling the south entrance road toward the south entrance of the park. Below Lewis Lake the river passes over several cascades and waterfalls including Lewis Falls. Shortly before leaving the park, the Lewis River merges with the Snake River, changing the course of the Snake southward. The Snake soon flows out of Yellowstone into Grand Teton National Park and Jackson Lake.
The Lewis River has rapids up to Class VI and takes a 29-foot (8.8 m) drop at Lewis Falls, the most famous of many waterfalls and rapids on this short but scenic river.
Brown, rainbow and cutthroat trout are found in the river.
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