Gardner Dam Reservoir Report

Last Updated: December 15, 2025

Gardner Dam, located in Snohomish County, Washington, was completed in 1961 and is owned by the local government.


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Summary

The dam, designed by Snohomish County Public Works, stands at a height of 11 feet with a hydraulic height of 11 feet and a structural height of 9 feet. Its primary purpose is for recreation, offering a serene spot for water resource and climate enthusiasts to enjoy the beauty of the Tr-Pilchuck River.

With a storage capacity of 56 acre-feet and a surface area of 40 acres, Gardner Dam plays a crucial role in managing water resources in the area. Despite its low hazard potential and current condition being unrated, the dam is regulated by the Washington Department of Ecology and undergoes regular inspections to ensure its safety and functionality. The dam also serves as a point of interest for those interested in sustainable water management practices and the impact of climate change on water resources.

Situated in Congressional District 01, Washington, Gardner Dam serves as a reminder of the importance of responsible water resource management in the face of evolving climate conditions. As a key recreational feature in the region, the dam offers a unique opportunity for visitors to appreciate the intersection of water infrastructure and environmental conservation. Its presence highlights the ongoing efforts to balance the needs of local communities with the preservation of natural resources in an era of changing climate patterns.

Year Completed

1961

Dam Length

125

River Or Stream

Tr-Pilchuck River

Primary Dam Type

Earth

Surface Area

40

Hydraulic Height

11

Drainage Area

0.2

Nid Storage

56

Structural Height

9

Hazard Potential

Low

Foundations

Soil

Nid Height

11
       
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.