Spring Hill Dam Reservoir Report

Last Updated: December 13, 2025

Spring Hill Dam in Malaga, Washington, is a captivating Earth dam completed in 1918 primarily for recreation purposes, with additional benefits for irrigation.


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Summary

With a height of 30 feet and a length of 800 feet, the dam provides a serene 33-acre surface area for outdoor enthusiasts to enjoy. The dam is situated on Tr-Stemilt Creek-Offstream, within the jurisdiction of the Washington Dept of Ecology, ensuring proper regulation, inspection, and enforcement to maintain its structural integrity.

Despite its age, Spring Hill Dam remains in satisfactory condition, with a high hazard potential due to its location and purpose. Regular inspections, last conducted in May 2018, help monitor its safety, with an inspection frequency of 5 years. The dam has a maximum storage capacity of 520 acre-feet, serving as a valuable water resource in the region. While the dam has not experienced significant modifications in recent years, its historical significance and importance for both water management and recreation make it a notable structure in the area.

Year Completed

1918

Dam Length

800

River Or Stream

Tr-Stemilt Creek-Offstream

Primary Dam Type

Earth

Surface Area

33

Hydraulic Height

30

Drainage Area

0.43

Nid Storage

520

Structural Height

30

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

30
       
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.