Traverse Lake Reservoir Reservoir Report

Last Updated: December 14, 2025

Traverse Lake Reservoir in Union, Oregon, is a privately-owned water resource designed primarily for irrigation purposes.


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Summary

The rockfill dam, completed in 1922, stands at a height of 10 feet and has a storage capacity of 120 acre-feet. Situated on West Eagle Creek, the reservoir covers a surface area of 17 acres and serves the surrounding agricultural community with a maximum discharge of 80 cubic feet per second.

With its low hazard potential and a condition assessment that is currently not rated, Traverse Lake Reservoir plays a crucial role in water management in the region. The dam features slide gates for outlet control and is inspected every 6 years to ensure its structural integrity and compliance with regulatory standards set by the Oregon Water Resources Department. Despite being privately owned, the reservoir's importance in supporting irrigation in the area underscores the significance of water resource management and climate adaptation efforts.

Located within the Walla Walla District, Traverse Lake Reservoir's strategic position and historical significance make it a valuable asset for water resource and climate enthusiasts. With its modest dimensions and regulated state jurisdiction, this reservoir contributes to the sustainable use of water for agricultural purposes while also highlighting the need for ongoing monitoring and maintenance to ensure its long-term functionality and resilience in the face of changing environmental conditions.

Year Completed

1922

Dam Length

420

Dam Height

10

River Or Stream

WEST EAGLE CREEK

Primary Dam Type

Rockfill

Surface Area

17

Hydraulic Height

8

Drainage Area

3

Nid Storage

120

Structural Height

10

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Nid Height

10
       
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.