Risley Reservoir Dam (no Longer Using 14605)
Risley Reservoir Dam (no Longer Using 14605) is a masonry dam located in Tolland County, Connecticut, built in 1853. It carries a Significant hazard potential classification and has a fair condition assessment.
About Risley Reservoir Dam (no Longer Using 14605)
The primary purpose of Risley Reservoir Dam (no Longer Using 14605) is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Town Of Manchester (local government). It impounds the Lydall Brook near Lydallville.
The dam stands 28 feet tall and stretches 625 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 226 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1853, the structure is one of the older dams in the region, with over a century and a half 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/15/2024.
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Location
| State | Connecticut |
| County | Tolland |
| Nearest City | Lydallville |
| River/Stream | Lydall Brook |
| Coordinates | 41.79843, -72.47219 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 625 ft |
| Year Completed | 1853 (173 years old) |
Storage & Hydraulics
| NID Storage | 226 acre-ft |
| Max Storage | 226 acre-ft |
| Normal Storage | 226 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 540 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Town of Manchester |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/15/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00211 |
| Federal ID | CT00211 |
| More Info | State Dam Safety Program |