Upper Millpond Dam, located in Old Lyme, Connecticut, is a historic masonry dam completed in 1820 with a primary purpose of recreation.
Wind
Humidity
The dam stands at a height of 11 feet and has a storage capacity of 50 acre-feet, serving as a vital resource for water recreation activities in the area. The dam is regulated by the Connecticut Department of Energy and Environmental Protection (DEEP), ensuring its safety and compliance with state guidelines.
With a significant hazard potential but a satisfactory condition assessment, Upper Millpond Dam remains a crucial structure for managing water resources in the region. The dam spans 120 feet in length and impounds Mill Brook, creating a surface area of 11.1 acres and a drainage area of 8.59 square miles. The dam features a valve outlet gate and a spillway width of 24 feet, allowing for controlled discharge during periods of high water flow.
Despite being privately owned, Upper Millpond Dam is subject to state permitting, inspection, and enforcement, highlighting the importance of maintaining its structural integrity and safety standards. The dam's association with recreation and its historical significance make it a key landmark in the area, attracting water resource and climate enthusiasts alike to appreciate its engineering marvel and environmental impact on the surrounding ecosystem.
Year Completed |
1820 |
Dam Length |
120 |
Dam Height |
11 |
River Or Stream |
MILL BROOK |
Primary Dam Type |
Masonry |
Surface Area |
11.1 |
Drainage Area |
8.59 |
Nid Storage |
50 |
Outlet Gates |
Valve |
Hazard Potential |
Significant |
Foundations |
Rock, Soil |
Nid Height |
11 |
East Branch Eightmile River Near North Lyme
|
29cfs |
Eightmile R At North Plain
|
24cfs |
Indian River Near Clinton
|
6cfs |
Salmon River Near East Hampton
|
119cfs |
Yantic River At Yantic
|
147cfs |
Connecticut R At Middle Haddam
|
14900cfs |
| Location | Reservations | Toilets |
|---|---|---|
Youth Site 2
|
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Youth Site 1
|
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Camp Bethel
|