Johnston is an earth dam located in Butler County, Pennsylvania, built in 1978. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 925 ft long, taller than 55% 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 Johnston
The primary purpose of Johnston is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Robert J. Johnston (private). It impounds the Tr Carrs Run.
The dam stands 26 feet tall and stretches 925 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 281 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1978, the structure is 48 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 06/11/2015. That was over 11 years ago.
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Location
| State | Pennsylvania |
| County | Butler |
| River/Stream | Tr Carrs Run |
| Coordinates | 41.15500, -79.77000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 925 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 281 acre-ft |
| Max Storage | 281 acre-ft |
| Normal Storage | 221 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Robert J. Johnston |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/11/2015 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | PA01075 |
| Federal ID | PA01075 |
| More Info | State Dam Safety Program |