Clock Tower Dam
Clock Tower Dam is an earth dam located in Middlesex County, Massachusetts, built in 1890. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Clock Tower Dam
The primary purpose of Clock Tower Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gp Mm Owner Llc (private). It impounds the Tributary Of Assabet River near Maynard.
The dam stands 20 feet tall and stretches 80 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 878 acre-feet, and collects water from a drainage area of 115 square miles. Completed in 1890, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/22/2022.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Maynard |
| River/Stream | Tributary Of Assabet River |
| Coordinates | 42.43001, -71.45510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Length | 80 ft |
| Year Completed | 1890 (136 years old) |
Storage & Hydraulics
| NID Storage | 878 acre-ft |
| Max Storage | 878 acre-ft |
| Normal Storage | 562 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 115 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GP MM Owner LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/22/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA01131 |
| Federal ID | MA01131 |
| More Info | State Dam Safety Program |