The San Joaquin River is one of the two major rivers that flow into the north end of San Francisco Bay. It rises on the slopes of Mt. Goddard in Kings Canyon National Park and flows first northwest, then southwest out of the Sierra Nevada. Behind Friant Dam, a project of the U.S. Bureau of Reclamation, the river forms Millerton Lake, a popular recreation spot. Below the dam it flows northeasterly through the Central Valley, through Stockton before joining the Sacramento River. The San Joaquin Valley is one of the most fertile in the United States and the agricultural center for California.