Sprague Lower Reservoir

About Sprague Lower Reservoir

The primary purpose of Sprague Lower Reservoir is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is private-owned. It impounds the Stillwater River-trib near Smithfield.

The dam stands 19 feet tall and stretches 250 feet across, creates a reservoir covering 30 acres, has a maximum storage capacity of 255 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1822, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. 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.

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