Johns Pond Dam is an earth dam located in Barnstable County, Massachusetts, built in 2003. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 8 ft8 ft tall and 38 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 Johns Pond Dam
The primary purpose of Johns 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 Mashpee (local government). It impounds the Quashnet River near Mashpee.
The dam stands 8 feet tall and stretches 38 feet across, creates a reservoir covering 336 acres, has a maximum storage capacity of 1,815 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 2003, the structure is relatively new.
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 12/16/2019.
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Location
| State | Massachusetts |
| County | Barnstable |
| Nearest City | Mashpee |
| River/Stream | Quashnet River |
| Coordinates | 41.63547, -70.51421 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Length | 38 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 1,815 acre-ft |
| Max Storage | 1,815 acre-ft |
| Normal Storage | 1,485 acre-ft |
| Surface Area | 336 acres |
| Drainage Area | 7 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Mashpee |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 12/16/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA01040 |
| Federal ID | MA01040 |
| More Info | State Dam Safety Program |