The Middle Fork is the Eel’s largest tributary. It rises in the Yolla Bolly Mountains in Trinity County. After being joined by Black Butte River, which flows from the north side of Hull Mountain in Mendocino County and joins the Middle Fork just east of Covelo in Round Valley, this fork travels 70 miles to the west through some of the most rugged wilderness in the state, draining 753 square miles. It joins the mainstem Eel at Dos Rios, the popular put-in place for rafters and kayakers making the four-day run through the famous Eel River canyon to Alderpoint.
Click above on major forks of the river to learn more about each one.