Prospect Island is a small island in the San Joaquin River delta, in California.[2][3][4][5][6][7] It is part of Solano County, and managed by Reclamation District 1667.[8][9][10][11] Its coordinates are 38°14′47″N 121°39′56″W / 38.2463030°N 121.6655110°W / 38.2463030; -121.6655110 (Prospect Island)[1].[12][13] It appears on a 1952 USGS map; by 1978, survey maps show it cut diagonally by the Sacramento River Deep Water Ship Channel.[14][15][16][17][18][19]
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