Osage Dam Reservoir Report

Last Updated: December 6, 2025

Osage Dam in Comanche, Oklahoma, is a Federal-owned structure managed by the Fish and Wildlife Service for the primary purpose of maintaining a Fish and Wildlife Pond.


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Summary

Completed in 1937, this concrete dam stands at a height of 25 feet and has a hydraulic height of 29 feet, with a length of 74 feet. The dam holds a storage capacity of 71 acre-feet and covers a surface area of 6 acres, serving the Cow Creek watershed with a drainage area of 1.4 square miles.

Despite its low hazard potential, Osage Dam's condition assessment is rated as poor, indicating a need for maintenance and potential upgrades. The dam is equipped with a slide (sluice gate) outlet gate and has a maximum discharge capacity of 1710 cubic feet per second. The last inspection was conducted in October 2020, with a scheduled inspection frequency of every 5 years. While the dam has not been modified in recent years, its operational and safety protocols are managed by the Fish and Wildlife Service to ensure the safety of the surrounding community and environment. As a valuable asset for water resource management in the region, Osage Dam plays a crucial role in supporting the local ecosystem and wildlife habitats along Cow Creek.

Year Completed

1937

Dam Length

74

Dam Height

25

River Or Stream

Cow Creek

Primary Dam Type

Concrete

Surface Area

6

Hydraulic Height

29

Drainage Area

1.4

Nid Storage

71

Structural Height

25

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock

Nid Height

29
       
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.