Canonsburg No 1 is an earth dam located in Washington County, Pennsylvania, built in 1911. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 36 ft36 ft tall and 765 ft long, taller than 82% 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 Canonsburg No 1
The primary purpose of Canonsburg No 1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by David J. Wylie (private). It impounds the Speers Run.
The dam stands 36 feet tall and stretches 765 feet across, creates a reservoir covering 37 acres, has a maximum storage capacity of 515 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1911, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/29/2017.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Washington |
| River/Stream | Speers Run |
| Coordinates | 40.25861, -80.13306 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 765 ft |
| Year Completed | 1911 (115 years old) |
Storage & Hydraulics
| NID Storage | 515 acre-ft |
| Max Storage | 515 acre-ft |
| Normal Storage | 375 acre-ft |
| Surface Area | 37 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | David J. Wylie |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/29/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00505 |
| Federal ID | PA00505 |
| More Info | State Dam Safety Program |