South Middleton Dam is a concrete dam located in Essex County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 75 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About South Middleton Dam
South Middleton Dam is a dam in Essex, Massachusetts. The dam is owned by Bostik, Inc. (private). It impounds the Ipswich River near Middleton.
The dam stands 10 feet tall and stretches 75 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 63 acre-feet, and collects water from a drainage area of 43 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. An emergency action plan is in place for this dam. The most recent inspection on record was 11/29/2021.
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Location
| State | Massachusetts |
| County | Essex |
| Nearest City | Middleton |
| River/Stream | Ipswich River |
| Coordinates | 42.56997, -71.03095 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Length | 75 ft |
Storage & Hydraulics
| NID Storage | 63 acre-ft |
| Max Storage | 63 acre-ft |
| Normal Storage | 39 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 43 sq mi |
| Max Discharge | 261 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Bostik, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/29/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA01137 |
| Federal ID | MA01137 |
| More Info | State Dam Safety Program |