Corral Creek Reservoir Report

Last Updated: December 19, 2025

Corral Creek, also known as Tom Pence Reservoir, is a private water resource located in Cascade, Idaho.


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Summary

Managed by the Idaho Department of Water Resources, this reservoir serves primarily for irrigation purposes. The dam, completed in 1952, stands at a height of 43.2 feet and has a storage capacity of 560 acre-feet.

With a drainage area of 1.3 square miles and a surface area of 33 acres, Corral Creek has a significant hazard potential and is classified as having a fair condition assessment. The spillway, which is uncontrolled, has a width of 8 feet, and the reservoir has a maximum discharge rate of 120 cubic feet per second. Despite these risks, the emergency action plan for the reservoir is yet to be prepared.

Climate and water resource enthusiasts will be intrigued by the history and engineering of Corral Creek, as well as the ongoing management and regulatory measures in place to ensure its safety and functionality. Its location amidst the picturesque Valley County, Idaho, and its critical role in irrigation make Corral Creek a fascinating case study for those interested in sustainable water resource management and the intersection of infrastructure and environmental conservation.

Year Completed

1952

Dam Length

290

Dam Height

43.2

River Or Stream

CORRAL CREEK BIG CREEK

Surface Area

33

Hydraulic Height

38.8

Drainage Area

1.3

Nid Storage

560

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

43
       
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.