Oak-Middle 86-A Reservoir Report
Nearby: Pruss Dam Oak-Middle 87-A
Last Updated: December 6, 2025
Oak-Middle 86-A is a flood risk reduction dam located in Seward, Nebraska, along TR-Middle Oak Creek.
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Summary
Built in 1963 by USDA NRCS, this earth dam stands at 32 feet high and spans 730 feet in length, with a storage capacity of 384 acre-feet. The dam is regulated by the Nebraska Department of Natural Resources and undergoes regular inspections to ensure its structural integrity.
Owned by the local government, Oak-Middle 86-A serves as a critical infrastructure for mitigating flood risks in the region. With a low hazard potential and satisfactory condition assessment, the dam provides essential protection to the surrounding community. The dam's primary purpose is flood risk reduction, and it has a normal storage capacity of 87 acre-feet, covering a drainage area of 1.2 square miles.
Situated in a rural area, Oak-Middle 86-A is closely monitored and maintained to meet state regulatory standards. With its strategic location along TR-Middle Oak Creek, the dam plays a vital role in safeguarding the environment and local residents from potential flooding events. As a key component of the region's water resource management infrastructure, Oak-Middle 86-A exemplifies the importance of proactive flood risk reduction measures in the face of changing climate patterns.
Year Completed |
1963 |
Dam Length |
730 |
Dam Height |
32 |
River Or Stream |
TR-MIDDLE OAK CREEK |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
30 |
Drainage Area |
1.2 |
Nid Storage |
384 |
Structural Height |
37 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Oak-Middle 86-A
Meadow Lark