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.
Mississippi River System
The Missouri River is a long stream that originates in southwest Montana and flows southeasterly for 2,522 miles; passing through six states before finally entering the Mississippi River at St. Louis. The Missouri River is the longest river on the North American continent. The Missouri River was one of the main routes for the watershed expansion of the United States during the 19th century.