Cyrus Reservoir Reservoir Report

Last Updated: December 5, 2025

Cyrus Reservoir, also known as Keith Cyrus Dam, is a private water resource located in Deschutes, Oregon, along Squaw Creek.


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Summary

Completed in 1968, this earth dam serves primarily for irrigation purposes, with a maximum storage capacity of 80 acre-feet and a normal storage capacity of 113 acre-feet. The reservoir covers a surface area of 7.7 acres and has a drainage area of 0.7 square miles. Despite its low hazard potential, Cyrus Reservoir is regulated, inspected, and enforced by the Oregon Water Resources Department to ensure its safety and compliance with state regulations.

With a dam height of 17 feet and a hydraulic height of 13 feet, Cyrus Reservoir stands at the intersection of water resource management and climate resilience in Oregon. The dam spans 1640 feet and has a structural height of 15 feet, providing essential water storage capacity for irrigation activities. The reservoir's location in a rural area without downstream settlements further emphasizes its importance for sustaining agricultural practices and water supply in the region. Despite not being federally owned, Cyrus Reservoir plays a crucial role in supporting the local economy and ecosystem through its efficient water management.

As water resource and climate enthusiasts continue to monitor and assess the state of water infrastructure across the country, Cyrus Reservoir stands out as a reliable and well-maintained irrigation reservoir in Oregon. With a history of effective operation and a focus on safety and regulatory compliance, this private water resource serves as a model for sustainable water management practices in the region. Its low hazard potential, combined with its significant storage capacity, highlights the essential role that Cyrus Reservoir plays in supporting agricultural activities and ensuring water security in Deschutes County.

Year Completed

1968

Dam Length

1640

Dam Height

17

River Or Stream

SQUAW CREEK

Primary Dam Type

Earth

Surface Area

7.7

Hydraulic Height

13

Drainage Area

0.7

Nid Storage

113

Structural Height

15

Hazard Potential

Low

Nid Height

17
       
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.