Stewart Reservoir (Polk) Reservoir Report

Last Updated: December 13, 2025

Stewart Reservoir in Polk County, Oregon, is a privately owned water resource that primarily serves irrigation purposes.


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Summary

Located along Athey Creek, this reservoir has a storage capacity of 70 acre-feet and a dam height of 21 feet. The reservoir is regulated by the Oregon Water Resources Department, ensuring that state permitting, inspection, and enforcement requirements are met to maintain its functionality. The low hazard potential of the dam indicates a minimal risk of failure, making it a reliable water source for agricultural needs in the region.

Although specific details about the dam type, construction year, and surface area are not provided, Stewart Reservoir's infrastructure includes needle outlet gates for water release. The last inspection in September 2015 indicated a satisfactory condition assessment, with a regular inspection frequency of every 6 years. While emergency action plans and inundation maps may not be fully developed, the reservoir's low hazard potential suggests a low risk of emergencies. Overall, Stewart Reservoir plays a crucial role in supporting irrigation activities in Polk County, contributing to the region's water resource management and agricultural sustainability.

Dam Height

21

River Or Stream

ATHEY CREEK

Nid Storage

70

Outlet Gates

Needle

Hazard Potential

Low

Nid Height

21
       
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.