General Motors Primary Lagoon

About General Motors Primary Lagoon

The primary purpose of General Motors Primary Lagoon is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Gm Defiance Casting Operations. It impounds the Maumee River - Offstream near Independence.

The dam stands 30 feet tall and stretches 2,300 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 230 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.

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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 04/26/2022.

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