Mcgrath Dam is a masonry dam located in New London County, Connecticut, built in 1900. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 180 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Mcgrath Dam
The primary purpose of Mcgrath Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Deep (state). It impounds the Yantic River near Lebanon.
The dam stands 10 feet tall and stretches 180 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 37 square miles. Completed in 1900, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Lebanon |
| River/Stream | Yantic River |
| Coordinates | 41.57387, -72.20519 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 180 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 37 sq mi |
| Max Discharge | 3,700 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut Deep |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00553 |
| Federal ID | CT00553 |
| More Info | State Dam Safety Program |