Mitchell - Stanley Reservoir Reservoir Report

Last Updated: December 13, 2025

Located in Colton, Oregon, the Mitchell - Stanley Reservoir is a privately owned structure designed for irrigation purposes.


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Summary

Completed in 1960, this Earth-type dam stands at a height of 25.5 feet and has a storage capacity of 42 acre-feet. With a surface area of 6 acres and a maximum discharge capacity of 260 cubic feet per second, the reservoir plays a crucial role in the management of water resources in the area.

Managed by the Oregon Water Resources Department, the Mitchell - Stanley Reservoir is regulated and inspected by state authorities to ensure its safe operation. With a low hazard potential and a condition assessment that is currently not rated, the reservoir serves as a reliable source of irrigation water for the surrounding area. Surrounded by the serene beauty of Clackamas County, this reservoir on Swagger Creek is a testament to sustainable water management practices in the region.

Visitors to the Mitchell - Stanley Reservoir can appreciate its engineering marvel while also marveling at the natural beauty of the area. With a history dating back to the 1960s, this reservoir continues to play a vital role in supporting agricultural activities in the region. As climate change continues to impact water resources, the importance of maintaining and managing reservoirs like this one becomes increasingly significant for ensuring water security in the face of changing environmental conditions.

Year Completed

1960

Dam Length

293

Dam Height

25

River Or Stream

SWAGGER CREEK

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

20

Drainage Area

1.4

Nid Storage

42

Structural Height

25.5

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.