Location and Description
Indian Lake Dam is part of Indian Lake State Park located in Logan County and was built in 1852 to impound a feeder lake to the Miami & Erie Canal. The dam has a maximum height of about 16 feet that carries a portion of State Route 366.
The dam has a 700-foot-long concrete spillway that discharges water from the lake into the Great Miami River. As a Class I high-hazard potential structure, a sudden failure of Indian Lake Dam likely would result in the structural collapse of at least one residence or one commercial or industrial business and probable loss of human life. (Hazard ratings refer to the consequences of dam failure, not the dam's condition).
Click here for more about the Dam Risk Reduction Program.
Indian Lake Dam currently has deficiencies that must be addressed to bring the dam into compliance with state dam safety standards. The deficiencies include insufficient storage-discharge capacity, seepage and instability concerns at the concrete spillway and along the entire embankment. The presence of trees and brush on the dam also are a safety issue; these materials were removed in early 2016.
ODNR is contracted with Stantec Consulting Services to provide investigations, preliminary design alternatives and final design. Their recent investigations of the dam structure revealed the concrete spillway is deteriorated and has a very low safety level. Due to complex issues and a potentially time consuming process to address all of the dam deficiencies, ODNR has proceeded with an incremental approach by preparing a final design to replace the existing spillway, reduce seepage and increase embankment stability. The new spillway will have the same dimension and crest elevation as the existing one that results in no change to the dam's existing hydraulic operations or lake levels.
Long Term Plan
Routine inspections and maintenance of the dam will continue. An emergency action plan will be revised and shared with local emergency management officials once it is completed.
Additional park information may be found on the Indian Lake State Park web page.