Grist Mill Pond Dam
Grist Mill Pond Dam is an earth dam located in Middlesex County, Massachusetts, built in 1800. It carries a Low hazard potential classification and has a fair condition assessment.
About Grist Mill Pond Dam
The primary purpose of Grist Mill Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Trustees Of The Wayside Inn (private). It impounds the Hop Brook near Sudbury.
The dam stands 18 feet tall, creates a reservoir covering 16 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1800, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/24/2019.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Sudbury |
| River/Stream | Hop Brook |
| Coordinates | 42.35717, -71.47570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Year Completed | 1800 (226 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Trustees of the Wayside Inn |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/24/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA01109 |
| Federal ID | MA01109 |
| More Info | State Dam Safety Program |