Wood Reservoir Dam No 1 Reservoir Report

Last Updated: December 15, 2025

Wood Reservoir Dam No 1, located in Malaga, Washington, is a privately owned earth dam that was completed in 1991 for the primary purpose of recreation.


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Summary

With a maximum storage capacity of 60 acre-feet and a normal storage level of 40.9 acre-feet, the dam serves the dual purposes of irrigation and recreation. The dam stands at a hydraulic height of 22 feet, with a hazard potential classified as high, but with a satisfactory condition assessment as of the last inspection in October 2018.

Managed by the Washington Department of Ecology, the Wood Reservoir Dam No 1 is state-regulated, with permitting, inspection, and enforcement all conducted by state agencies. The dam is situated on Tr-Stemilt Creek-Offstream and falls under the jurisdiction of Congressional District 08, represented by Kim Schrier (D). The reservoir covers an area of 8.3 acres and has a drainage area of 0.02 square miles, with a maximum discharge capacity of 4.7 cubic feet per second.

Despite its age, Wood Reservoir Dam No 1 continues to provide valuable recreational opportunities and essential water resources for the local community. Its satisfactory condition and regular state oversight ensure its continued safe operation for both irrigation and recreation purposes in the Chelan County area of Washington.

Year Completed

1991

River Or Stream

Tr-Stemilt Creek-Offstream

Primary Dam Type

Earth

Surface Area

8.3

Hydraulic Height

22

Drainage Area

0.02

Nid Storage

60

Structural Height

22

Hazard Potential

High

Foundations

Soil

Nid Height

22
       
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.