Mercers Pond Dam
Mercers Pond Dam is an earth dam located in Fairfield County, Connecticut, built in 1870. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Mercers Pond Dam
The primary purpose of Mercers Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Deer Hill Partners Llp (private). It impounds the Boggs Pond Brook near Danbury.
The dam stands 20 feet tall and stretches 320 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 51 acre-feet, and collects water from a drainage area of 4 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 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 09/06/2023.
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 | Fairfield |
| Nearest City | Danbury |
| River/Stream | Boggs Pond Brook |
| Coordinates | 41.40183, -73.47641 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 320 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 51 acre-ft |
| Max Storage | 51 acre-ft |
| Normal Storage | 34 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 1,060 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Deer Hill Partners LLP |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00068 |
| Federal ID | CT00068 |
| More Info | State Dam Safety Program |