Seymour Reservoir #1 Dam is an earth dam located in New Haven County, Connecticut, built in 1898. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 340 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Seymour Reservoir #1 Dam
The primary purpose of Seymour Reservoir #1 Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Connecticut Deep (state). It impounds the Hemp Swamp Br Trib near Pine Bridge.
The dam stands 26 feet tall and stretches 340 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 49 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1898, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/16/2021.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Connecticut |
| County | New Haven |
| Nearest City | Pine Bridge |
| River/Stream | Hemp Swamp Br Trib |
| Coordinates | 41.43552, -73.08446 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 340 ft |
| Year Completed | 1898 (128 years old) |
Storage & Hydraulics
| NID Storage | 49 acre-ft |
| Max Storage | 49 acre-ft |
| Normal Storage | 49 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 105 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Connecticut Deep |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/16/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00358 |
| Federal ID | CT00358 |
| More Info | State Dam Safety Program |