Glades
Glades is an earth dam located in Butler County, Pennsylvania, built in 1974. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Glades
The primary purpose of Glades is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Pa Game Commission (state). It impounds the South Branch Slippery Rock Cr.
The dam stands 24 feet tall and stretches 960 feet across, creates a reservoir covering 390 acres, has a maximum storage capacity of 8,600 acre-feet, and collects water from a drainage area of 22 square miles. Completed in 1974, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 11/20/2020.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Pennsylvania dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Pennsylvania |
| County | Butler |
| River/Stream | South Branch Slippery Rock Cr |
| Coordinates | 41.06167, -79.89528 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 960 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 8,600 acre-ft |
| Max Storage | 8,600 acre-ft |
| Normal Storage | 1,350 acre-ft |
| Surface Area | 390 acres |
| Drainage Area | 22 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | PA GAME COMMISSION |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/20/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00804 |
| Federal ID | PA00804 |
| More Info | State Dam Safety Program |