Mount Holyoke College Lower Pond Dam

About Mount Holyoke College Lower Pond Dam

The primary purpose of Mount Holyoke College Lower Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mount Holyoke College (private). It impounds the Stony Brook near S. Hadley.

The dam stands 24 feet tall and stretches 240 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 68 acre-feet, and collects water from a drainage area of 18 square miles. Completed in 1936, the structure is well-established, with more than 75 years of service.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 08/16/2022.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Massachusetts dam safety program can provide more specific information about emergency planning for this structure.

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