'Geist Reservoir Dam is located at the lake's southern end. Fed by Fall Creek on the north, the lake overflow is directed into the creek again at the south. The earthen dam is 44 feet high, with a length of 1400 feet at its crest. The reservoir capacity is 60,000 acre-feet, although normal storage is 21,180 acre feet.
The reservoir is mostly rather shallow (ten feet or less). The area has undergone rapid development, many high-valued homes now line the reservoir's waterfront and within some of the most affluent ZIP codes in Indianapolis.
Geist Reservoir is 1,900 acres (769 ha) and spans three counties in Indiana (Marion, Hamilton, and Hancock), four voting precincts, four school districts (Lawrence, Hamilton Southeastern, and Mt. Vernon).
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