Hardisty Wilson East Reservoir Report

Last Updated: December 13, 2025

Hardisty Wilson East is a private irrigation dam located in Owyhee, Idaho, along an unnamed stream known as Wilson Creek.


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Summary

Built in 1918, this earth dam stands at a height of 9.4 meters and has a hydraulic height of 6.8 meters, serving the primary purpose of irrigation with a storage capacity of 120 acre-feet. The dam has a low hazard potential and was last inspected in August 2017, with a satisfactory condition assessment.

Owned privately, the dam falls under the regulatory jurisdiction of the Idaho Department of Water Resources, with state permitting, inspection, and enforcement in place. Although the spillway type is listed as "None," the dam has a maximum discharge capacity of 70 cubic feet per second. With a drainage area of 0.11 square miles, the dam covers a surface area of 25 acres and plays a crucial role in managing water resources in the region.

Despite its age, Hardisty Wilson East remains a vital structure for water management in the area, ensuring a stable water supply for irrigation purposes. With its risk assessment classified as high, the dam is monitored regularly to uphold safety standards and protect against potential hazards. As a key component of the local water infrastructure, this dam serves as a testament to the ongoing importance of water resource management in the face of changing climatic conditions.

Year Completed

1918

Dam Length

250

Dam Height

9.4

River Or Stream

UNNAMED STREAM WILSON CREEK

Surface Area

25

Hydraulic Height

6.8

Drainage Area

0.11

Nid Storage

120

Outlet Gates

None

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

9
       
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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.