Isakson Reservoir Reservoir Report

Last Updated: December 13, 2025

Isakson Reservoir in Clackamas, Oregon, is a private water resource managed by the Natural Resources Conservation Service.


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Summary

Completed in 1972, this Earth dam stands at a height of 30 feet and has a storage capacity of 29 acre-feet. With a primary purpose of recreation, the reservoir also serves fire protection, stock, and small fish pond needs in the area.

Located in Sandy, Oregon, this reservoir covers a surface area of 3.87 acres and has a low hazard potential. The dam has a maximum discharge capacity of 54 cubic feet per second and is state-regulated with inspection, permitting, and enforcement measures in place by the Oregon Water Resources Department. The surrounding area offers opportunities for outdoor enthusiasts to enjoy activities such as fishing, boating, and wildlife observation.

Isakson Reservoir provides a serene escape for water resource and climate enthusiasts, offering a peaceful setting for recreational activities while serving important community needs. With its tranquil waters and scenic surroundings, this reservoir is a valuable asset in Clackamas County, Oregon.

Year Completed

1972

Dam Length

384

Dam Height

27

River Or Stream

UNNAMED

Primary Dam Type

Earth

Surface Area

3.87

Hydraulic Height

23

Drainage Area

0.29

Nid Storage

29

Structural Height

30

Hazard Potential

Low

Nid Height

30
       
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.