Griggs Pond Dam
Griggs Pond Dam is an earth dam located in Windham County, Connecticut, built in 1870. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Griggs Pond Dam
The primary purpose of Griggs 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 Lebanon Brook near Woodstock.
The dam stands 7 feet tall and stretches 95 feet across, creates a reservoir covering 34 acres, has a maximum storage capacity of 153 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half of service.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/29/2021.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Woodstock |
| River/Stream | Lebanon Brook |
| Coordinates | 41.99823, -72.08590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 95 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 153 acre-ft |
| Max Storage | 153 acre-ft |
| Normal Storage | 153 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 25 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut DEEP |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/29/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00439 |
| Federal ID | CT00439 |
| More Info | State Dam Safety Program |