John Sutter is starting a project on California 's San Joaquin River and watershed . He is going to try to walk and kayak down the river . Comment: It starts in the Sierra Nevada and flows into the San Francisco Bay .
John Sutter is starting a project on California 's San Joaquin River and watershed . He is going to try to walk and kayak down the river . American Rivers named the San Joaquin the `` most endangered '' U.S. river . It starts in the Sierra Nevada and flows into the San Francisco Bay .