North Fork American River
The North Fork American River is the longest branch of the American River in Northern California. It is long from its source at the crest of the Sierra Nevada, near Lake Tahoe, to its mouth at Folsom Lake northeast of Sacramento. Prior to the construction of Folsom Dam the river was about longer making for a total length of .
Payette River
The Payette River is famous for its whitewater. Experts call the North Fork Class V run one of the most challenging river reaches in North America, if not the world. Kayaking on the lower North Fork from Smith's Ferry to Banks is world-class, easily viewed from state highway #55, which closely hugs its bank, primarily on the west side. The lower North Fork narrows and drops 1700 feet (518 m) in the 16 miles (26 km) above Banks, providing nearly endless Class V rapids (see International Scale of River Difficulty). The average gradient is per mile (21 m/km) with a maximum gradient of 200 ft/mile (38 m/km). The North Fork's flow rate is controlled through the Cascade Dam, completed in 1948, providing relatively warm water from the shallow Cascade Reservoir.