Jack Sinn Wetland Dam
Jack Sinn Wetland Dam is an earth dam located in Lancaster County, Nebraska, built in 2000. It carries a Low hazard potential classification and has a fair condition assessment.
About Jack Sinn Wetland Dam
The primary purpose of Jack Sinn Wetland Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Nebraska Game & Parks Commission (state). It impounds the Tr-ash Hollow Creek near Greenwood.
The dam stands 18 feet tall and stretches 1,220 feet across, creates a reservoir covering 63 acres, has a maximum storage capacity of 179 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2000, the structure is 26 years 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/04/2021.
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Location
| State | Nebraska |
| County | Lancaster |
| Nearest City | Greenwood |
| River/Stream | Tr-ash Hollow Creek |
| Coordinates | 41.03993, -96.63162 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 15 ft |
| Dam Length | 1,220 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 179 acre-ft |
| Max Storage | 179 acre-ft |
| Normal Storage | 73 acre-ft |
| Surface Area | 63 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 17 cfs |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Nebraska Game & Parks Commission |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/04/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02558 |
| Federal ID | NE02558 |
| More Info | State Dam Safety Program |