Contact: Mark Shwartz
Caption: Land surface in California’s San Joaquin Valley subsided about 29 feet (9 meters) between 1925 and 1977 because of groundwater depletion. Signs on the telephone pole indicate the former elevations of the land surface in 1925 and 1955.
Credit: Richard Ireland, U.S. Geological Survey (1977)
Usage Restrictions: CREDIT: Richard Ireland, U.S. Geological Survey (1977)
Related news release: California groundwater management trickles up from local sources