Groff Mill
Groff Mill is a stone dam located in Lancaster County, Pennsylvania, built in 1919. It carries a Low hazard potential classification.
About Groff Mill
The primary purpose of Groff Mill is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by A. Jerry Landis (private). It impounds the Mill Creek.
The dam stands 8 feet tall and stretches 100 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 54 acre-feet, and collects water from a drainage area of 21 square miles. Completed in 1919, the structure is over a century 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 06/12/2017.
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Location
| State | Pennsylvania |
| County | Lancaster |
| River/Stream | Mill Creek |
| Coordinates | 40.02667, -76.24167 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 100 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 54 acre-ft |
| Max Storage | 54 acre-ft |
| Normal Storage | 9 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 21 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | A. JERRY LANDIS |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 06/12/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | PA01008 |
| Federal ID | PA01008 |
| More Info | State Dam Safety Program |