Marshall Reservoir No. 2 is an earth dam located in Washington County, Pennsylvania, built in 1928. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 37 ft37 ft tall and 330 ft long, taller than 83% of U.S. dams with a recorded height. 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 Marshall Reservoir No. 2
The primary purpose of Marshall Reservoir No. 2 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Marshall Lake Homeowners Association, Inc (private). It impounds the West Branch St Patricks Run.
The dam stands 37 feet tall and stretches 330 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 353 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1928, the structure is well-established, with more than 75 years of service.
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 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 12/12/2018.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Washington |
| River/Stream | West Branch St Patricks Run |
| Coordinates | 40.42861, -80.33583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 330 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 353 acre-ft |
| Max Storage | 353 acre-ft |
| Normal Storage | 240 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Marshall Lake Homeowners Association, Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/12/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00503 |
| Federal ID | PA00503 |
| More Info | State Dam Safety Program |