Hammer Island facts for kids
|Adjacent bodies of water||Sacramento–San Joaquin River Delta|
|Highest elevation||0 ft (0 m)|
Hammer Island is a small island in the Sacramento–San Joaquin River Delta. It is part of Contra Costa County, California. Its coordinates are , and the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981.
Hammer Island Facts for Kids. Kiddle Encyclopedia.