Hammer Island

Hammer Island is a small island in the Sacramento–San Joaquin River Delta, in Contra Costa County, California,^[2][3][4][5] originally named Santos Island, it was changed to Hammer Island after Hans Hammer purchased the island from Mr. Santos in 1939.^[6] Its coordinates are 37°48′59″N 121°33′25″W^[1],; the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981,^[1] and it appears on a 1978 USGS map.^[7]

LocationNorthern California

Coordinates37°48′59″N 121°33′25″W^[1]

Adjacent toSacramento–San Joaquin River Delta

Highestelevation0 ft (0 m)^[1]

Quick facts Geography, Location ...

Hammer Island

USGS aerial imagery of Hammer Island; Mendota Canal is to the west, and Old River is to the east.
Hammer Island Show map of Sacramento-San Joaquin River Delta Hammer Island Show map of California Hammer Island Show map of the United States
Geography
Location	Northern California
Coordinates	37°48′59″N 121°33′25″W[1]
Adjacent to	Sacramento–San Joaquin River Delta
Highest elevation	0 ft (0 m)[1]
Administration
United States
State	California
County	Contra Costa

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