Jack Sinn Wetland Dam Reservoir Report
Nearby: Martin Dam Stewart Dam
Last Updated: December 15, 2025
Jack Sinn Wetland Dam, located in Lancaster County, Nebraska, is a state-regulated water resource managed by the Nebraska Department of Natural Resources.
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Summary
Built in 2000 by the USDA NRCS, this earth dam stands at a height of 15 feet and serves as a Fish and Wildlife Pond with a storage capacity of 179 acre-feet. The dam has a low hazard potential and is in satisfactory condition as of its last inspection in July 2011.
Situated along the TR-ASH HOLLOW CREEK, Jack Sinn Wetland Dam covers a surface area of 63 acres and has a drainage area of 0.2 square miles. With a maximum discharge capacity of 17 cubic feet per second, the dam provides essential habitat for aquatic wildlife and contributes to the conservation efforts in the region. The dam's primary purpose is to support fish and wildlife populations, making it a valuable resource for environmental enthusiasts and climate conservationists.
Managed by the Natural Resources Conservation Service and located in the city of Greenwood, Jack Sinn Wetland Dam plays a crucial role in regulating water flow and preserving the surrounding ecosystem. With its stone core and soil foundation, the dam exemplifies sustainable infrastructure design and underscores the importance of responsible water management practices. As a focal point for water resource and climate enthusiasts, Jack Sinn Wetland Dam stands as a testament to the intersection of environmental conservation and engineering excellence in safeguarding our natural resources for future generations.
Year Completed |
2000 |
Dam Length |
1220 |
Dam Height |
15 |
River Or Stream |
TR-ASH HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
63 |
Hydraulic Height |
11 |
Drainage Area |
0.2 |
Nid Storage |
179 |
Structural Height |
18 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rock Creek Near Ceresco
|
14cfs |
Wahoo Creek At Ithaca
|
53cfs |
Little Salt Creek Near Lincoln
|
2cfs |
Salt Creek At Greenwood
|
125cfs |
Salt Creek At 70th St. At Lincoln
|
92cfs |
Stevens Creek Nr. Lincoln
|
3cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Jack Sinn Wetland Dam