Slack Reservoir

About Slack Reservoir

The primary purpose of Slack Reservoir is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Slack's Reservoir Association, Inc. (private). It impounds the Stillwater River-trib near Smithfield.

The dam stands 17 feet tall and stretches 220 feet across, creates a reservoir covering 150 acres, has a maximum storage capacity of 1,780 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1885, the structure is over a century old.

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.

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

Search for dams near your address to see all dams in your area with hazard classifications and safety data.