Olyphant No 3 is an earth dam located in Lackawanna County, Pennsylvania, built in 1898. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 38 ft38 ft tall and 760 ft long, taller than 84% 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 Olyphant No 3
The primary purpose of Olyphant No 3 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 38 feet tall and stretches 760 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 157 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1898, 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 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Lackawanna |
| River/Stream | Grassy Island Creek |
| Coordinates | 41.47222, -75.52889 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 760 ft |
| Year Completed | 1898 (128 years old) |
Storage & Hydraulics
| NID Storage | 157 acre-ft |
| Max Storage | 157 acre-ft |
| Normal Storage | 115 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 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 | PA00381 |
| Federal ID | PA00381 |
| More Info | State Dam Safety Program |