Mansfield Hollow Dam - Dike F, also known as Mansfield Hollow Lake, is a gravity dam located in Willimantic, Connecticut, along the Nachaug River.
Wind
Humidity
Built in 1952 by the US Army Corps of Engineers, the dam stands at a height of 78 feet and serves the primary purpose of flood risk reduction. With a storage capacity of 76,000 acre-feet and a normal storage level of 2,800 acre-feet, the dam plays a crucial role in managing water levels and mitigating flood risks in the region.
The dam's spillway, with a width of 690 feet, is uncontrolled, allowing for the release of water to manage downstream flow and relieve pressure on the structure. With a high hazard potential, the dam undergoes regular inspections and has an emergency action plan in place to address any potential risks. The US Army Corps of Engineers actively manages the dam's flood risks by monitoring its condition, prioritizing maintenance activities, and collaborating with local emergency managers to ensure preparedness and response in the event of a dam-related emergency.
As a key infrastructure for flood control in the area, Mansfield Hollow Dam - Dike F plays a critical role in protecting surrounding communities from potential flooding events. With ongoing risk management measures in place, including regular maintenance and updates to the emergency action plan, the dam continues to be a vital asset in safeguarding the region's water resources and climate resilience.
Year Completed |
1952 |
Dam Length |
14050 |
Dam Height |
78 |
River Or Stream |
NACHAUG RIVER |
Primary Dam Type |
Gravity |
Surface Area |
450 |
Hydraulic Height |
74 |
Drainage Area |
159 |
Nid Storage |
76000 |
Structural Height |
78 |
Hazard Potential |
High |
Nid Height |
78 |
Natchaug River At Willimantic
|
322cfs |
Willimantic River Near Coventry
|
189cfs |
Shetucket River Near Willimantic
|
777cfs |
Mount Hope River Near Warrenville
|
32cfs |
Little River Near Hanover
|
44cfs |
Yantic River At Yantic
|
147cfs |
| Location | Reservations | Toilets |
|---|---|---|
Highland Campground
|
||
Brialee
|
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Wilderness Lake Campground
|