Mirror Lake Dam
Mirror Lake Dam is a gravity dam located in Worcester County, Massachusetts, built in 1913. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mirror Lake Dam
The primary purpose of Mirror Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Fitchburg (local government). It impounds the Monoosnoc Brook, Tributary To Nashua River near Fitchburg.
The dam stands 15 feet tall and stretches 160 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 45 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1913, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 11/19/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Fitchburg |
| River/Stream | Monoosnoc Brook, Tributary To Nashua River |
| Coordinates | 42.55871, -71.80071 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 15 ft |
| Dam Length | 160 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 38 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 139 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Fitchburg |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/19/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA02779 |
| Federal ID | MA02779 |
| More Info | State Dam Safety Program |