Dams in Union County, Pennsylvania
4Total Dams
1High Hazard
2Significant
Dam Safety in Union County, Pennsylvania
Union County has 4 dams tracked in the National Inventory of Dams. Of these, 1 are classified as high hazard — meaning failure would probably cause loss of human life. Another 2 carry a significant hazard classification.
The average dam in Union County is 39 years old. The most common purpose is water supply. The tallest dam is Spruce Run Reservoir at 46 ft.
Explore more: Oldest dams in Pennsylvania · Tallest dams · High risk dams · Largest reservoirs
Data note: Hazard potential describes the consequences if a dam failed; it does not predict the likelihood of failure. Inspection, condition, and emergency-plan fields can be incomplete or delayed. Check state dam-safety officials and local emergency managers for official guidance.
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Spruce Run Reservoir | High | Fair | 46 | Water Supply | 1957 |
| Stony Run | Significant | Not Rated | 39 | Water Supply | |
| Great Stream Commons Upper | Significant | Not Rated | 17 | Flood Risk Reduction | 2001 |
| Great Stream Commons Lower | Low | Not Rated | 24 | Flood Risk Reduction | 2001 |