| East Fork Lewis River | |
|---|---|
 The East Fork Lewis River at Moulton Falls Park | |
  Location of the mouth of the Lewis River in Washington  East Fork Lewis River (the United States) | |
| Etymology | A. Lee Lewis, early settler |
| Native name | Yahkohtl (Yakama) (Klickitat people) |
| Location | |
| Country | United States |
| State | Washington |
| County | Skamania and Clark |
| Physical characteristics | |
| Source | Green Lookout Mountain |
| • location | Skamania County |
| • coordinates | 45°50′33″N 122°05′56″W / 45.84250°N 122.09889°W[1] |
| • elevation | 4,442 ft (1,354 m) |
| Mouth | Lewis River |
• location | Ridgefield, Washington |
• coordinates | 45°51′57″N 122°43′08″W / 45.86583°N 122.71889°W[1] |
• elevation | 10 ft (3.0 m) |
| Length | 43.5 mi (70.0 km) |
| Basin size | 150,635 acres |
| Basin features | |
| Waterfalls | Sunset Falls, Moulton Falls, Lucia Falls |
The East Fork Lewis River is a river in the state of Washington in the United States. It is the largest tributary of the Lewis River. Its source is on Green Lookout Mountain in Skamania County. It then flows to the west through Clark County until it converges with the Lewis about 3.5 mi (5.6 km) upstream from the Columbia River.