Wilson Creek 2-Y Reservoir Report

Last Updated: December 6, 2025

Wilson Creek 2-Y, located in Otoe County, Nebraska, is a local government-owned earth dam designed by the USDA NRCS that serves primarily for flood risk reduction along the TR-N FK Little Nemaha River.


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Summary

Completed in 1969, this dam stands at a height of 39 feet with a hydraulic height of 36 feet and a structural height of 40 feet. With a storage capacity of 423 acre-feet and a normal storage of 73 acre-feet, Wilson Creek 2-Y covers a surface area of 10 acres and has a drainage area of 1.1 square miles.

Despite its importance in flood risk reduction, Wilson Creek 2-Y is currently assessed to be in poor condition as of the last inspection in May 2016, with a low hazard potential. The dam has a history of being state-regulated and permitted by the Nebraska Department of Natural Resources, with inspections and enforcement also carried out by state agencies. With a history of modifications and regular inspections, Wilson Creek 2-Y remains a crucial infrastructure for managing water resources and climate-related risks in the region, highlighting the importance of ongoing maintenance and improvements to ensure its effectiveness in mitigating flood hazards.

Year Completed

1969

Dam Length

839

Dam Height

39

River Or Stream

TR-N FK LITTLE NEMAHA RIVER

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

36

Drainage Area

1.1

Nid Storage

423

Structural Height

40

Hazard Potential

Low

Foundations

Soil

Nid Height

40
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.