Lower Twin Lakes Dam

About Lower Twin Lakes Dam

The primary purpose of Lower Twin Lakes Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Pompton Lakes Borough Mua (private). It impounds the Post Brook near Wayne.

The dam stands 10 feet tall and stretches 210 feet across, creates a reservoir covering 40 acres, has a storage capacity of 128 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1927, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/23/2023.

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