The Eel River Watershed encompasses approximately 3,684 square miles.
The headwaters are in northeastern Mendocino County and the river runs about 200 miles to the Pacific just south of Eureka in Humboldt County.
The Eel is home to coho and Chinook salmon, steelhead trout, and cutthroat trout.
Multiple hydropower projects (Scott Dam and Cape Horn Dam) and logging activities have blocked fish passage and caused water quality issues (specifically sediment).
Cape Horn Dam, part of PG&E’s Potter Valley Project, diverts water from the Eel to the Russian River, which has reduced the river’s base flow. Much of the watershed is now protected under state parks and national forest, and restoration efforts are underway.