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 .
Missouri River
The Missouri's headwaters above Three Forks extend much farther upstream than the main stem. Measured to the farthest source at Brower's Spring, the Jefferson River is long. Thus measured to its highest headwaters, the Missouri River stretches for . When combined with the lower Mississippi, the Missouri and its headwaters form part of the fourth-longest river system in the world, at .