Lower Mill Pond Dam is an earth dam located in Barnstable County, Massachusetts, built in 1920. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 7 ft7 ft tall and 100 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Lower Mill Pond Dam
The primary purpose of Lower 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 Town of Brewster (local government). It impounds the Stony Brook near Brewster.
The dam stands 7 feet tall and stretches 100 feet across, creates a reservoir covering 51 acres, has a maximum storage capacity of 690 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1920, the structure is over a century old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/06/2023.
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Location
| State | Massachusetts |
| County | Barnstable |
| Nearest City | Brewster |
| River/Stream | Stony Brook |
| Coordinates | 41.74419, -70.11253 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Length | 100 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 690 acre-ft |
| Max Storage | 690 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 51 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 46 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Brewster |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/06/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA01076 |
| Federal ID | MA01076 |
| More Info | State Dam Safety Program |