Located in Walpole, Massachusetts, the Allen Site Dam, also known as Diamond Brook Dam, was completed in 1981 by the USDA NRCS for the primary purpose of flood risk reduction.
Wind
Humidity
This earth dam spans 1,520 feet with a height of 21 feet and has a storage capacity of 509 acre-feet. It sits on Spring Brook and serves multiple purposes including flood risk reduction, fish and wildlife pond, and recreation.
With a drainage area of 1.31 square miles, the Allen Site Dam has a high hazard potential and a moderate risk assessment. The dam features an uncontrolled spillway with a width of 120 feet and outlet gates that are also uncontrolled. While the condition assessment is not rated, the dam has not been inspected recently and is in need of reassessment. Despite these challenges, the Allen Site Dam remains an important structure for managing water resources in the area.
The dam is owned by the local government and receives funding, design, and construction support from the Natural Resources Conservation Service. While not regulated by the state, the Allen Site Dam plays a crucial role in mitigating flood risks and providing recreational opportunities for the community. As climate change continues to impact water resources, the Allen Site Dam will be essential for maintaining the balance between flood control and environmental sustainability in the region.
Year Completed |
1981 |
Dam Length |
1520 |
Dam Height |
21 |
River Or Stream |
SPRING BROOK |
Primary Dam Type |
Earth |
Surface Area |
17 |
Hydraulic Height |
21 |
Drainage Area |
1.31 |
Nid Storage |
509 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
21 |
| Location | Reservations | Toilets |
|---|---|---|
Camp Christina Entrance
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YMCA Camp
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Missionary Point
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Ponkapoag Camp of Appalachian Mountain Club
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Spang Camp Site
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