American River
The North Fork is the longest tributary of the American River, at . It begins at an elevation of about near Lake Tahoe in Placer County at Mountain Meadow Lake, just northeast of Granite Chief and immediately due west of Squaw Valley Ski Resort. It flows westward through remote wilderness areas.
Hoquiam River
The East, West, and Middle Forks all originate north of Grays Harbor and flow generally south. The East Fork Hoquiam River is the longest, at long. It joins the West Fork to form the main stem Hoquiam River near Hoquiam and Aberdeen. The West Fork and Middle Fork are both long. The West Fork is paralleled by U.S. Route 101. It joins the East Fork form the main stem Hoquiam River. The Middle Fork is a tributary of the West Fork.