Jug Creek Upper Reservoir Report

Last Updated: December 15, 2025

Jug Creek Upper, also known as Upper Jug Creek Reservoir, is a privately owned dam located in Valley, Idaho.


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Summary

Completed in 1946, this earth dam stands at a height of 32.3 feet and has a maximum storage capacity of 1132 acre-feet. With a primary purpose of irrigation, the dam serves the surrounding area with water from Jug Creek and Louie Creek.

The reservoir covers an area of 85 acres and has a controlled spillway with a width of 20 feet. It has a significant hazard potential and is classified as being in fair condition as of the last assessment in July 2019. The dam is regularly inspected by state authorities and meets permitting, inspection, and enforcement requirements. In case of emergencies, the dam is equipped with an emergency action plan to ensure the safety of downstream communities.

Located within the Walla Walla District, Jug Creek Upper plays a crucial role in water resource management in the region. With its very high risk assessment rating, the dam is closely monitored to mitigate any potential hazards and ensure the continued reliability of its irrigation functions. For water resource and climate enthusiasts, Jug Creek Upper represents a fascinating intersection of infrastructure, sustainability, and natural resource management in the beautiful landscape of Idaho.

Year Completed

1946

Dam Length

500

Dam Height

32.3

River Or Stream

JUG CREEK LOUIE CREEK

Surface Area

85

Hydraulic Height

26.1

Drainage Area

3

Nid Storage

1132

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

32
       
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.