Carty Reservoir Reservoir Report

Last Updated: May 3, 2026

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Carty Reservoir, located in Arlington, Oregon, is a vital water resource managed by a public utility agency for irrigation purposes.


Summary

Completed in 1976, this reservoir boasts an impressive dam height of 80 feet and a storage capacity of 150,000 acre-feet, providing essential water for agriculture in the region. With a surface area of 1450 acres and a drainage area of 65 square miles, Carty Reservoir plays a crucial role in water management along the Columbia River.

The reservoir's significant hazard potential underscores the importance of regular inspections and maintenance to ensure its structural integrity. Despite being classified as "Not Rated" in terms of condition assessment, the reservoir's emergency action plan and risk management measures are key aspects that need to be continually updated and improved. With a maximum discharge capacity of 22,000 cubic feet per second, Carty Reservoir holds immense potential in water resource management and climate resilience efforts in the region.

As a key water infrastructure project in Morrow County, Oregon, Carty Reservoir stands as a testament to the importance of sustainable water management practices. With its strategic location along the Columbia River and its critical role in irrigation, this reservoir serves as a cornerstone for agricultural activities in the area. Moving forward, continued investment in inspection, maintenance, and risk mitigation measures will be essential to ensure the long-term viability and safety of Carty Reservoir for generations to come.

15-Day Long Term Forecast


Year Completed

1976

Dam Length

6800

Dam Height

80

River Or Stream

COLUMBIA RIVER (COOLING)

Primary Dam Type

Earth

Surface Area

1450

Hydraulic Height

78

Drainage Area

65

Nid Storage

150000

Structural Height

82

Hazard Potential

Significant

Nid Height

82
       
Seasonal Comparison

5-Day Hourly Forecast Detail

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.