Longham Reservoir Dam is an earth dam located in Essex County, Massachusetts, built in 1975. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 240 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 Longham Reservoir Dam
The primary purpose of Longham Reservoir Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Salem-beverly Water Supply Board (local government). It impounds the Longham Brook near Beverly.
The dam stands 15 feet tall and stretches 240 feet across, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 11/12/2020.
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Location
| State | Massachusetts |
| County | Essex |
| Nearest City | Beverly |
| River/Stream | Longham Brook |
| Coordinates | 42.59081, -70.86978 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 240 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 100 acre-ft |
| Drainage Area | 3 sq mi |
| Max Discharge | 125 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Salem-beverly Water Supply Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/12/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA00182 |
| Federal ID | MA00182 |
| More Info | State Dam Safety Program |