King Reservoir South Dam Reservoir Report

Last Updated: December 13, 2025

King Reservoir South Dam, located in Murphy, Idaho, is a privately owned structure regulated by the Idaho Department of Water Resources.


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Summary

Built in 1969 for the primary purpose of irrigation, this earth dam stands at a height of 33 feet and has a hydraulic height of 29 feet. With a storage capacity of 300 acre-feet and a surface area of 28 acres, the dam helps control water flow from unnamed streams and Little McBride Creek.

Despite being classified as having a significant hazard potential, the dam is currently in fair condition and is inspected every four years. It has a spillway width of 7 feet and a maximum discharge rate of 31 cubic feet per second. While the risk assessment for the dam is moderate, there are no emergency action plans in place as of the last inspection in June 2018. With its critical role in providing water for irrigation in the region, the King Reservoir South Dam serves as a vital resource in managing water resources and climate impacts in the area.

Year Completed

1969

Dam Length

1075

Dam Height

33

River Or Stream

UNNAMED STREAMS LITTLE MC BRIDE CREEK

Surface Area

28

Hydraulic Height

29

Drainage Area

1.1

Nid Storage

300

Outlet Gates

None

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

33
       
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.