 The reservoir capacity is 60,000 acre-feet (74,000,000 m3), although normal storage is 21,180 acre-feet (26,100,000 m3).The reservoir is mostly rather shallow ( or less); the depth at the dam is and the maximum depth is .Geist Reservoir covers and spans three counties in Indiana (Marion, Hamilton, and Hancock), four voting precincts, three school districts (Lawrence, Hamilton Southeastern, and Mt.