Sportsman Lake Dam Reservoir Report

Last Updated: December 15, 2025

Sportsman Lake Dam, located in San Juan, Washington, is a privately owned structure primarily used for irrigation purposes.


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Summary

Completed in 1960, this earth dam stands at a hydraulic height of 7 feet and a structural height of 5 feet, with a length of 63 feet. It has a normal storage capacity of 272 acre-feet and a maximum storage capacity of 500 acre-feet, serving as a vital resource for the surrounding area.

Managed by the Washington Department of Ecology, Sportsman Lake Dam is regulated, inspected, and enforced by the state to ensure its safety and compliance with established standards. Despite being classified as low hazard potential and not yet rated for its condition assessment, the dam plays a crucial role in providing water for irrigation and recreational activities in the region. With its location on Tr-San Juan Channel, the dam is positioned to support the water needs of the community while maintaining environmental sustainability.

As a key part of the local water infrastructure, Sportsman Lake Dam represents a significant contribution to water resource management in the area. While its condition assessment is pending, the dam's operational history since 1960 underscores its importance in supporting agricultural activities and recreational opportunities. With ongoing state oversight and inspection, the dam continues to play a vital role in ensuring water security and access for residents in San Juan, Washington.

Year Completed

1960

Dam Length

63

River Or Stream

Tr-San Juan Channel

Primary Dam Type

Earth

Surface Area

250

Hydraulic Height

7

Nid Storage

500

Structural Height

5

Hazard Potential

Low

Foundations

Soil

Nid Height

7
       
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.