Mulkey Reservoir Report

Last Updated: December 13, 2025

Mulkey, Gryland Reservoir in Oregon is a privately owned water resource designed primarily for irrigation purposes.


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Summary

Completed in 1981, this earth dam stands at a height of 10 feet with a hydraulic height of 7 feet, providing a storage capacity of 50 acre-feet. The reservoir covers a surface area of 6.85 acres and is fed by Berry Creek, serving as a vital source of water for agricultural activities in the region.

Situated in Polk County, Oregon, Mulkey, Gryland Reservoir has a low hazard potential and is currently in a not rated condition. The dam has a maximum discharge capacity of 154 cubic feet per second and spans a length of 203 feet. While it is state-regulated and subject to regular inspections and enforcement, the dam's emergency action plan and risk assessment measures are not specified in the available data.

Water resource and climate enthusiasts will appreciate the strategic location and purpose of Mulkey, Gryland Reservoir, which plays a crucial role in supporting irrigation needs in the region. With its modest size and low hazard potential, this reservoir exemplifies responsible water management practices while contributing to the sustainability of agricultural activities in Polk County, Oregon.

Year Completed

1981

Dam Length

203

Dam Height

10

River Or Stream

BERRY CREEK

Primary Dam Type

Earth

Surface Area

6.85

Hydraulic Height

7

Drainage Area

0.2

Nid Storage

50

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.