Hopkinton State Park Swimming Pool Dam
Hopkinton State Park Swimming Pool Dam is an earth dam located in Middlesex County, Massachusetts, built in 1967. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Hopkinton State Park Swimming Pool Dam
The primary purpose of Hopkinton State Park Swimming Pool Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ma Department Of Conservation & Recreation (state). It impounds the Unnamed Tributary To Indian Brook near Ashland.
The dam stands 16 feet tall and stretches 380 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 146 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/06/2024.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Massachusetts dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Ashland |
| River/Stream | Unnamed Tributary To Indian Brook |
| Coordinates | 42.25903, -71.50687 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Length | 380 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 146 acre-ft |
| Max Storage | 146 acre-ft |
| Normal Storage | 71 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 51 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MA Department of Conservation & Recreation |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/06/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00438 |
| Federal ID | MA00438 |
| More Info | State Dam Safety Program |