O.C. Fisher Dam Reservoir Report

Last Updated: December 5, 2025

O.C.


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Summary

Fisher Dam, also known as O. C. Fisher Lake, is a Federal-owned earth dam located on the Concho River in San Angelo, Texas. Completed in 1952, the dam primarily serves the purpose of flood risk reduction, with additional benefits including fish and wildlife pond, recreation, and water supply. With a height of 128 feet and a length of 40,885 feet, the dam has a storage capacity of 766,000 acre-feet and a surface area of 5,400 acres.

Despite its role in reducing flood risk to downstream communities, a risk assessment conducted in May 2020 classified the dam's hazard potential as high due to the large population living in the immediate downstream area. The most significant risk comes from high-volume releases through the uncontrolled spillway during extreme weather events, potentially putting thousands of people at risk. To mitigate these risks, regular inspections, surveillance, and maintenance are conducted, while an updated Emergency Action Plan ensures coordinated responses in case of emergencies. A planned study in 2022 aims to further analyze and reduce the risks associated with the dam, highlighting ongoing efforts to safeguard the surrounding communities and infrastructure.

Year Completed

1952

Dam Length

40885

Dam Height

128

River Or Stream

CONCHO RIVER

Primary Dam Type

Earth

Surface Area

5400

Hydraulic Height

122

Drainage Area

1511

Nid Storage

766000

Structural Height

130

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

130
       
Seasonal Comparison

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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.