Upper Clark Reservoir Reservoir Report

Last Updated: December 13, 2025

Upper Clark Reservoir, also known as Clark Reservoir 2, is a Federal-owned water supply reservoir located in Malheur, Oregon.


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Summary

Managed by the Bureau of Land Management, this gravity dam was completed in 2004 and has a maximum storage capacity of 280 acre-feet. With a normal storage level of 61.9 acre-feet, the reservoir covers a surface area of 56 acres and serves as a vital water source in the region.

Situated in the Walla Walla District, Upper Clark Reservoir plays a crucial role in water supply for the area. The dam stands at a height of 12 feet and has a structural length of 240 feet. Although its hazard potential is rated as low and its condition is not currently assessed, the reservoir undergoes inspections every five years to ensure its safety and functionality. With no spillway and a lack of associated structures, the focus remains on its primary purpose of water supply.

This picturesque reservoir, nestled in the Oregon landscape, offers a glimpse into the intricate infrastructure that supports water resource management in the region. As a gravity dam constructed with buttress and stone core types, Upper Clark Reservoir exemplifies the dedication of the Bureau of Land Management in providing a sustainable water supply for the surrounding communities. The reservoir's strategic location and ample storage capacity make it a valuable asset in the ongoing efforts to balance water resource utilization and conservation in the area.

Year Completed

2004

Dam Length

240

Primary Dam Type

Gravity

Surface Area

56

Hydraulic Height

12

Nid Storage

280

Structural Height

12

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

12
       
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.