Johnson Creek Dam
Johnson Creek Dam is an earth dam located in Essex County, Massachusetts, built in 1913. It carries a Significant hazard potential classification and has a poor condition assessment.
About Johnson Creek Dam
The primary purpose of Johnson Creek Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Groveland (local government). It impounds the Johnson Creek near Groveland.
The dam stands 16 feet tall and stretches 100 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 220 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1913, the structure is over a century old.
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 11/03/2022.
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Location
| State | Massachusetts |
| County | Essex |
| Nearest City | Groveland |
| River/Stream | Johnson Creek |
| Coordinates | 42.73872, -71.04260 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Length | 100 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 160 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Groveland |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/03/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00188 |
| Federal ID | MA00188 |
| More Info | State Dam Safety Program |