Overcash Dam Reservoir Report

Last Updated: December 5, 2025

Overcash Dam, located in Lincoln, Nebraska, on the TR-MIDDLE OAK CREEK, is a private earth dam primarily built for flood risk reduction purposes.


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Summary

Standing at a height of 24.55 feet and completed in 1980, the dam boasts a storage capacity of 54.8 acre-feet and covers a surface area of 3.2 acres. Despite its low hazard potential, the dam's condition assessment was reported as poor during its last inspection in June 2017, raising concerns about its structural integrity and the need for improvements.

Managed by the Nebraska Department of Natural Resources, the Overcash Dam is subject to state regulation, jurisdiction, permitting, inspection, and enforcement to ensure compliance with safety standards. Although its emergency action plan status and risk assessment details are currently undisclosed, the dam's proximity to residential areas and its role in flood management highlight the importance of maintaining its structural integrity and operational efficiency. As the dam's condition assessment raises red flags, stakeholders and climate enthusiasts are urged to monitor its maintenance and potential risk mitigation measures to safeguard the surrounding community and water resources.

Despite its poor condition assessment, the Overcash Dam remains a vital infrastructure for flood risk reduction in Seward County, Nebraska. As the dam's structural integrity comes under scrutiny, ongoing monitoring and potential rehabilitation efforts are crucial to ensure its continued effectiveness in managing floodwaters and protecting downstream areas. With a focus on enhancing safety measures and addressing maintenance concerns, stakeholders can work towards preserving this key water resource infrastructure for the benefit of the local community and the surrounding ecosystem.

Year Completed

1980

Dam Length

250

Dam Height

24.55

River Or Stream

TR-MIDDLE OAK CREEK

Primary Dam Type

Earth

Surface Area

3.2

Hydraulic Height

21.77

Drainage Area

0.57

Nid Storage

54.8

Structural Height

24.55

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Overcash DamOAK CREEK AT AIR PARK RD AT LINCOLN Preview Oak Creek At Air Park Rd At Lincoln
15.1cfs
15cfs
Overcash DamMIDDLE CREEK AT SW 40th ST. AT LINCOLN Preview Middle Creek At Sw 40th St. At Lincoln
1.26cfs
1cfs
Overcash DamLITTLE SALT CREEK NEAR LINCOLN Preview Little Salt Creek Near Lincoln
3.49cfs
3cfs
Overcash DamSALT CREEK AT LINCOLN Preview Salt Creek At Lincoln
76.6cfs
77cfs
Overcash DamHAINES BRANCH AT SW 56th ST. AT LINCOLN Preview Haines Branch At Sw 56th St. At Lincoln
1.33cfs
1cfs
Overcash DamSALT CREEK AT 70th ST. AT LINCOLN Preview Salt Creek At 70th St. At Lincoln
91.8cfs
92cfs

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.
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