Three Creek Reservoir Report

Last Updated: December 5, 2025

Three Creek is a federal water resource in Sisters, Oregon, managed by the USDA Forest Service for irrigation purposes.


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Summary

The dam at Three Creek is an earth dam standing at 21 feet tall, with a length of 230 feet and a storage capacity of 1500 acre-feet. The dam's spillway is uncontrolled, with a width of 15 feet, and it is considered to have a significant hazard potential.

Despite being in a moderate risk category, Three Creek has not been rated for its condition assessment. The last inspection took place in November 2019, and the dam is regulated by the Oregon Water Resources Department. Although the dam is currently not rated for its condition, it serves as a vital resource for irrigation in the area, highlighting the importance of continued monitoring and maintenance to ensure its safety and efficiency for the surrounding community and ecosystem.

Dam Length

230

Dam Height

21

Primary Dam Type

Earth

Surface Area

80

Drainage Area

2

Nid Storage

1500

Structural Height

21

Outlet Gates

Uncontrolled

Hazard Potential

Significant

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.