The Stewart Tract is an island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California, and managed by Reclamation District 2062. Its coordinates are 37°48′13″N 121°20′53″W / 37.80361°N 121.34806°W / 37.80361; -121.34806 (Stewart Tract), and the United States Geological Survey measured its elevation as 13 ft (4.0 m) in 1981.