The San Joaquin River has three major tributaries: The Merced, Tuolumne, and Stanislaus rivers. The Cosumnes (a tributary to Mokelumne River), Mokelumne, and Calaveras rivers also flow into the San Joaquin where the river joins the tidally influenced "Delta" This large body of water covers just over 1,150 square miles or nearly 73 percent, devoted to agriculture farm land. How do i fish a location like this? I guess the better question is, Where do i even start?