Olyphant No 2 is an earth dam located in Lackawanna County, Pennsylvania, built in 1888. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 55 ft55 ft tall and 180 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Olyphant No 2
The primary purpose of Olyphant No 2 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Dcnr (state). It impounds the Grassy Island Creek.
The dam stands 55 feet tall and stretches 180 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 85 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1888, 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 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 09/14/2020.
At 55 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Lackawanna |
| River/Stream | Grassy Island Creek |
| Coordinates | 41.46556, -75.53444 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 180 ft |
| Year Completed | 1888 (138 years old) |
Storage & Hydraulics
| NID Storage | 85 acre-ft |
| Max Storage | 85 acre-ft |
| Normal Storage | 9 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Dcnr |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/14/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | PA00382 |
| Federal ID | PA00382 |
| More Info | State Dam Safety Program |