Gillen Reservoir Reservoir Report

Last Updated: December 6, 2025

Gillen Reservoir, located in Crook County, Oregon, is a private water storage facility primarily used for irrigation purposes.


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Summary

This earth dam structure spans 560 feet in length and stands at a height of 26 feet, with a storage capacity of 90 acre-feet. Situated on Wickiup Creek, a tributary of the Crooked River, this reservoir covers an area of 7 acres and serves as a vital resource for agricultural activities in the region.

Managed by the Oregon Water Resources Department, Gillen Reservoir has a low hazard potential and is not currently rated for its condition assessment. Despite its significance for irrigation and fire protection, the reservoir has not been modified in recent years and does not have a designated spillway. The remote location of Gillen Reservoir, with no downstream settlements, adds to its unique charm as a tranquil water source in the heart of Oregon's picturesque landscape.

Although lacking in certain modern features and assessments, Gillen Reservoir remains a valuable asset for water resource management in the region. With its serene surroundings and essential role in supporting local agriculture, this reservoir stands as a testament to the importance of sustainable water infrastructure in the face of changing climate patterns. Enthusiasts of water resources and climate conservation can appreciate the significance of Gillen Reservoir as a vital component of Oregon's water management network.

Dam Length

560

Dam Height

26

River Or Stream

WICKIUP CREEK, TRIB/CROOKED

Primary Dam Type

Earth

Surface Area

7

Drainage Area

11.1

Nid Storage

90

Hazard Potential

Low

Nid Height

26
       
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.