Hammond Dam is a rockfill dam located in Tioga County, Pennsylvania, built in 1978. It carries a High hazard potential classification.
Dam profile
NID height · 122 ft122 ft tall and 6,450 ft long, taller than 98% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Hammond Dam
The primary purpose of Hammond Dam 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 USACE - Baltimore District (federal). It impounds the Crooked Creek near Tioga.
The dam stands 122 feet tall and stretches 6,450 feet across, creates a reservoir covering 685 acres, has a maximum storage capacity of 136,936 acre-feet, and collects water from a drainage area of 122 square miles. Completed in 1978, the structure is 48 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/15/2021.
At 122 feet, this dam is taller than 98% of all dams in the United States.
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 | Tioga |
| Nearest City | Tioga |
| River/Stream | Crooked Creek |
| Coordinates | 41.89939, -77.14695 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 122 ft |
| Dam Height | 122 ft |
| Dam Length | 6,450 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 136,936 acre-ft |
| Max Storage | 136,936 acre-ft |
| Normal Storage | 8,625 acre-ft |
| Surface Area | 685 acres |
| Drainage Area | 122 sq mi |
| Max Discharge | 218,100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Baltimore District |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 07/15/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01133 |
| Federal ID | PA01133 |
| More Info | State Dam Safety Program |