Cooley Hill Reservoir Dam
Cooley Hill Reservoir Dam is an earth dam located in Worcester County, Massachusetts, built in 1887. It carries a Significant hazard potential classification and has a poor condition assessment.
About Cooley Hill Reservoir Dam
The primary purpose of Cooley Hill Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Midnight Harvest Tree Nursery, Llc (private). It impounds the Unnamed Tributary To Willow Creek near N. Brookfield.
The dam stands 18 feet tall and stretches 400 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1887, the structure is over a century old.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 04/27/2023.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | N. Brookfield |
| River/Stream | Unnamed Tributary To Willow Creek |
| Coordinates | 42.23383, -72.09113 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Length | 400 ft |
| Year Completed | 1887 (139 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Midnight Harvest Tree Nursery, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/27/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA01932 |
| Federal ID | MA01932 |
| More Info | State Dam Safety Program |