Silvia's Upper Pond Dam

About Silvia's Upper Pond Dam

The primary purpose of Silvia's Upper Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Briarpatch Llc;gunther;pollock (private). It impounds the Stony Brook (west) Sylvias Brook (east) near Stonington.

The dam stands 12 feet tall and stretches 120 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 262 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half 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. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 11/04/1986. That was 39 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.

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 Connecticut dam safety program can provide more specific information about emergency planning for this structure.

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