Ipswich Mills Dam
Ipswich Mills Dam is a dam located in Essex County, Massachusetts, built in 1637. It carries a Low hazard potential classification and has a fair condition assessment.
About Ipswich Mills Dam
Ipswich Mills Dam is a dam in Essex, Massachusetts. The dam is owned by Town Of Ipswich (local government). It impounds the Ipswich River near Ipswich.
The dam stands 11 feet tall and stretches 180 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 300 acre-feet, and collects water from a drainage area of 149 square miles. Completed in 1637, the structure is one of the older dams in the region, with over a century and a half of service.
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 09/04/2020.
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Location
| State | Massachusetts |
| County | Essex |
| Nearest City | Ipswich |
| River/Stream | Ipswich River |
| Coordinates | 42.67767, -70.83777 |
Physical Characteristics
| NID Height | 11 ft |
| Dam Length | 180 ft |
| Year Completed | 1637 (389 years old) |
Storage & Hydraulics
| NID Storage | 300 acre-ft |
| Max Storage | 300 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 149 sq mi |
| Max Discharge | 3,900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Town of Ipswich |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/04/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA00231 |
| Federal ID | MA00231 |
| More Info | State Dam Safety Program |