Oknoname 30157 Reservoir Report

Last Updated: December 13, 2025

Oknoname 30157 is a privately owned dam located in Alva, Oklahoma, within Woods County.


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Summary

Built in 2000 by the USDA NRCS, this Earth-type dam stands at a height of 31 feet and has a hydraulic height of 27.4 feet. It serves as a crucial structure on the UNNAMED TRIB YELLOWSTONE CR., providing a storage capacity of 40 acre-feet and a surface area of 2.7 acres. The dam is regulated by the Oklahoma Water Resources Board (OWRB) and undergoes regular inspections, with a low hazard potential but a very high risk assessment rating due to its critical role in managing water resources in the area.

Despite its relatively low hazard potential, Oknoname 30157 is considered to be at very high risk due to its strategic importance in mitigating flood risks and managing water resources in the region. With a controlled spillway and a single valve outlet gate, the dam has a normalized storage capacity of 21 acre-feet and serves a drainage area of 160 square miles. The dam's condition is currently not rated, and its last inspection took place in November 2010, with a scheduled inspection frequency of 5 years. As a significant structure in the Tulsa District, the dam plays a vital role in supporting agricultural activities and protecting the surrounding communities from potential water-related disasters.

Year Completed

2000

Dam Length

184

Dam Height

31

River Or Stream

UNNAMED TRIB YELLOWSTONE CR.

Primary Dam Type

Earth

Surface Area

2.7

Hydraulic Height

27.4

Drainage Area

160

Nid Storage

40

Structural Height

30.4

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
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.