Sundstrom Dam No 1 Reservoir Report

Last Updated: December 14, 2025

Sundstrom Dam No 1, located in San Juan, Washington, serves multiple purposes including fire protection, stock maintenance, and small fish pond irrigation.


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Summary

This privately owned earth dam, completed in 1970, stands at a height of 16 feet with a hydraulic height of 16 feet and a length of 220 feet. The dam has a storage capacity of 60 acre-feet and covers a surface area of 40 acres, contributing to the efficient management of water resources in the region.

Managed by the Washington Department of Ecology, Sundstrom Dam No 1 is regulated and inspected regularly to ensure its structural integrity and operational efficiency. The dam has a low hazard potential and is not currently rated for its condition assessment. While no emergency action plan has been prepared or updated for the dam, its risk management measures are being monitored to uphold safety standards and prevent any potential risks associated with its operation.

With its strategic location on Tr-False Bay, Sundstrom Dam No 1 plays a crucial role in the water resource management of the area, providing essential services for fire protection, irrigation, and stock maintenance. As a key infrastructure for the region, the dam's functions and safety are closely monitored by state regulatory agencies to ensure its continued effectiveness in mitigating climate-related challenges and preserving water resources for the community.

Year Completed

1970

Dam Length

220

River Or Stream

Tr-False Bay

Primary Dam Type

Earth

Surface Area

40

Hydraulic Height

16

Drainage Area

0.25

Nid Storage

60

Structural Height

16

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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.