Lake Cohasset Dam

About Lake Cohasset Dam

The primary purpose of Lake Cohasset Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mill Creek Metropolitan Park Dist. (local government). It impounds the Mill Creek near Youngstown.

The dam stands 25 feet tall and stretches 190 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 373 acre-feet, and collects water from a drainage area of 74 square miles. Completed in 1897, the structure is over a century old.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 10/13/2021.

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