Casperson Reservoir Report

Last Updated: December 6, 2025

Casperson is a private water resource structure located in Franklin, Idaho, serving the primary purpose of irrigation.


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Summary

Built in 1958, this earth-filled dam stands at a height of 22.4 feet and has a storage capacity of 110 acre-feet. The dam spans 425 feet in length and is supported by stone core types with rock and soil foundations.

This low-hazard structure is regulated by the Idaho Department of Water Resources, with regular inspections conducted to ensure its fair condition and operational safety. The dam is equipped with a slide (sluice gate) outlet and an uncontrolled spillway, allowing for a maximum discharge of 71 cubic feet per second. Despite its modest risk assessment rating of moderate (3), Casperson remains a crucial component in the management of water resources in the region, particularly for agricultural irrigation purposes.

With its proximity to unnamed streams and Battle Creek, Casperson plays a vital role in the water infrastructure of the area, supporting the agricultural needs of the community. The dam's location in a remote setting further underscores its importance in sustaining water availability for both human consumption and ecological balance. As climate change continues to impact water resources, structures like Casperson will be key in ensuring sustainable water management practices for future generations.

Year Completed

1958

Dam Length

425

Dam Height

22.4

River Or Stream

UNNAMED STREAMS BATTLE CREEK

Surface Area

18

Hydraulic Height

18.2

Drainage Area

3.4

Nid Storage

110

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

22
       
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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.