Glasgo Pond Dam
Glasgo Pond Dam is a masonry dam located in New London County, Connecticut, built in 1860. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Glasgo Pond Dam
The primary purpose of Glasgo Pond 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 Pachaug River near Griswold.
The dam stands 26 feet tall and stretches 375 feet across, creates a reservoir covering 184 acres, has a storage capacity of 2,208 acre-feet, and collects water from a drainage area of 37 square miles. Completed in 1860, the structure is one of the older dams in the region, with over a century and a half of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/23/2023.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Connecticut dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Connecticut |
| County | New London |
| Nearest City | Griswold |
| River/Stream | Pachaug River |
| Coordinates | 41.55688, -71.88887 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 375 ft |
| Year Completed | 1860 (166 years old) |
Storage & Hydraulics
| NID Storage | 2,208 acre-ft |
| Normal Storage | 2,208 acre-ft |
| Surface Area | 184 acres |
| Drainage Area | 37 sq mi |
| Max Discharge | 466 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut DEEP |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/23/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00084 |
| Federal ID | CT00084 |
| More Info | State Dam Safety Program |