Warm Springs Reservoir Report

Last Updated: December 13, 2025

Warm Springs, also known as W-3, is a concrete dam located on the Middle Fork Malheur River in Juntura, Oregon.


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Summary

Built in 1918 by the Bureau of Reclamation, this federal-owned structure serves primarily for irrigation purposes, with a storage capacity of 192,400 acre-feet and a maximum discharge of 9,800 cubic feet per second. The dam stands at a height of 100 feet, with a hydraulic height of 92 feet and a structural height of 106 feet, making it a significant asset for water resource management in the region.

With a surface area of 4,600 acres and a drainage area of 1,100 acres, Warm Springs plays a crucial role in regulating water flow and ensuring water availability for agricultural activities in the area. Despite its age, the dam is considered to have a high hazard potential, highlighting the importance of regular inspections and maintenance to ensure its continued safety and efficiency. Managed by the Bureau of Reclamation, Warm Springs remains a key infrastructure for water supply and climate resilience in the Malheur County, Oregon.

As a vital component in the water management system of the region, Warm Springs represents a blend of historical significance and practical utility. Its role in facilitating irrigation and water storage underscores the importance of sustainable water resource management in the face of changing climate patterns. With its rich history and essential functions, Warm Springs stands as a testament to the enduring value of water infrastructure for supporting agricultural livelihoods and environmental sustainability in Oregon.

Year Completed

1918

Dam Length

469

Dam Height

100

River Or Stream

MIDDLE FORK MALHEUR RIVER

Primary Dam Type

Concrete

Surface Area

4600

Hydraulic Height

92

Drainage Area

1100

Nid Storage

192400

Structural Height

106

Hazard Potential

High

Foundations

Rock

Nid Height

106
       
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.