Morfitt Reservoir Reservoir Report

Last Updated: December 13, 2025

Morfitt Reservoir, also known as Mills Reservoir, is a privately owned water storage facility located in Unity, Oregon.


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Summary

Built in 1914 for irrigation purposes, this off-channel reservoir has a dam height of 20 feet and a storage capacity of 280 acre-feet. With a surface area of 22.5 acres and a drainage area of 0.5 square miles, Morfitt Reservoir plays a crucial role in providing water for agricultural use in the region.

Managed by the Oregon Water Resources Department, Morfitt Reservoir is subject to state regulation, inspection, and enforcement to ensure its safe operation. Despite being classified as having a low hazard potential, the reservoir undergoes regular inspections to maintain its structural integrity. The last inspection was conducted in June 2015, with a scheduled frequency of every 6 years.

Located within the Portland District and under the jurisdiction of the state of Oregon, Morfitt Reservoir serves as a vital water resource for the surrounding community. With its historical significance and contribution to irrigation, this reservoir stands as a testament to the importance of sustainable water management in the face of changing climate conditions.

Year Completed

1914

Dam Length

470

Dam Height

20

River Or Stream

OFF-CHANNEL

Primary Dam Type

Earth

Surface Area

22.5

Hydraulic Height

20

Drainage Area

0.5

Nid Storage

280

Structural Height

20

Hazard Potential

Low

Nid Height

20
       
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.