Great Stream Commons Upper is an earth dam located in Union County, Pennsylvania, built in 2001. It carries a Significant hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 100 ft long. 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 Great Stream Commons Upper
The primary purpose of Great Stream Commons Upper is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Union County Economic Development Corporation (local government). It impounds the Tr Susquehanna River.
The dam stands 17 feet tall and stretches 100 feet across, creates a reservoir covering 0 acres, has a maximum storage capacity of 10 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2001, the structure is relatively new.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/24/2019.
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Location
| State | Pennsylvania |
| County | Union |
| River/Stream | Tr Susquehanna River |
| Coordinates | 41.11667, -76.89944 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 100 ft |
| Year Completed | 2001 (25 years old) |
Storage & Hydraulics
| NID Storage | 10 acre-ft |
| Max Storage | 10 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Union County Economic Development Corporation |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/24/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01698 |
| Federal ID | PA01698 |
| More Info | State Dam Safety Program |