Mashpee River Fishway Dam
Mashpee River Fishway Dam is an earth dam located in Barnstable County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
About Mashpee River Fishway Dam
Mashpee River Fishway Dam is a dam in Barnstable, Massachusetts. The dam is owned by Town Of Mashpee (local government). It impounds the Mashpee River near Mashpee.
The dam stands 12 feet tall and stretches 250 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 4,500 acre-feet, and collects water from a drainage area of 14 square miles.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 11/10/2022.
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Location
| State | Massachusetts |
| County | Barnstable |
| Nearest City | Mashpee |
| River/Stream | Mashpee River |
| Coordinates | 41.64927, -70.48500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Length | 250 ft |
Storage & Hydraulics
| NID Storage | 4,500 acre-ft |
| Max Storage | 4,500 acre-ft |
| Normal Storage | 2 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 14 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Town of Mashpee |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/10/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA02552 |
| Federal ID | MA02552 |
| More Info | State Dam Safety Program |