Crowther Reservoir Report

Last Updated: December 6, 2025

Crowther, also known as Crowther's Mill Dam, is a privately owned irrigation structure located in Malad City, Idaho.


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Summary

Built in 1948, this Earth dam stands at a height of 90 feet and has a storage capacity of 959 acre-feet. The dam spans 850 feet in length and serves the primary purpose of irrigation for the surrounding area, drawing water from Spring Creek and the Malad River.

Despite its age, Crowther Dam has been well-maintained with regular state inspections and enforcement ensuring its safety. With a spillway width of 5 feet and a maximum discharge capacity of 106 cubic feet per second, this dam poses a high hazard potential but is currently assessed to be in fair condition. The risk assessment for Crowther Dam indicates a moderate risk level, highlighting the importance of ongoing monitoring and risk management measures to protect both the structure and the community it serves.

Year Completed

1948

Dam Length

850

Dam Height

90

River Or Stream

SPRING CREEK MALAD RIVER

Surface Area

33

Hydraulic Height

85.4

Drainage Area

1.2

Nid Storage

959

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

90
       
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.