Harwich Lower Reservoir Dam is an earth dam located in Plymouth County, Massachusetts, built in 1900. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 500 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 Harwich Lower Reservoir Dam
The primary purpose of Harwich Lower Reservoir Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by A.d. Makepeace Company (private). It impounds the Tributary of Rose Brook near Carver.
The dam stands 11 feet tall and stretches 500 feet across, has a maximum storage capacity of 75 acre-feet, and collects water from a drainage area of 9,000 square miles. Completed in 1900, 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.
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Location
| State | Massachusetts |
| County | Plymouth |
| Nearest City | Carver |
| River/Stream | Tributary of Rose Brook |
| Coordinates | 41.80428, -70.73827 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 500 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Normal Storage | 60 acre-ft |
| Drainage Area | 9,000 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | A.d. Makepeace Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA00403 |
| Federal ID | MA00403 |
| More Info | State Dam Safety Program |