Allen Creek Reservoir Report

Last Updated: December 15, 2025

Located in Crook County, Oregon, Allen Creek is a privately-owned dam primarily used for irrigation purposes.


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Summary

Completed in 1959, this dam stands at a height of 78 feet and has a hydraulic height of 76 feet. With a storage capacity of 2189 acre-feet, Allen Creek serves as a vital water resource for the surrounding area, with a drainage area of 12.36 square miles.

The dam features an uncontrolled spillway and slide gates for outlet control, with a maximum discharge of 750 cubic feet per second. Despite being classified as having a low hazard potential, the risk assessment for Allen Creek is moderate, indicating the need for ongoing monitoring and risk management measures. The dam is regulated and inspected by the Oregon Water Resources Department, ensuring compliance with state requirements for operation and maintenance.

Although the condition assessment for Allen Creek is currently listed as "Not Rated," regular inspections are conducted every 6 years to assess the structure's integrity and safety. With its strategic location in the watershed and its critical role in irrigation, Allen Creek remains a key feature in the water resource management of the region, providing essential water supply for agricultural and environmental needs.

Year Completed

1959

Dam Length

850

Dam Height

78

River Or Stream

ALLEN CREEK

Primary Dam Type

Other

Surface Area

78

Hydraulic Height

76

Drainage Area

12.36

Nid Storage

2189

Structural Height

83

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Nid Height

83
       
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.