Watson Reservoir Reservoir Report

Last Updated: December 6, 2025

Watson Reservoir, also known as Merwin Reservoir #3, is a privately-owned water resource located in Crook County, Oregon.


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Summary

Built in 1970 for irrigation purposes, this Earth-type dam stands at a height of 32 feet and has a maximum storage capacity of 2102 acre-feet. With a surface area of 103.6 acres and a drainage area of 22.4 square miles, Watson Reservoir plays a crucial role in water management for the region.

Situated along Watson Creek in the city of Post, this reservoir is regulated by the Oregon Water Resources Department and undergoes regular state inspections and enforcement measures. Despite its low hazard potential, Watson Reservoir ensures water security for agricultural activities in the area. The dam features a slide (sluice gate) outlet gate and has a normal storage capacity of 2102 acre-feet. With a maximum discharge rate of 1250 cubic feet per second, the reservoir serves as a vital water source for the surrounding community.

In the event of any emergencies, Watson Reservoir has protocols in place for risk management and emergency action planning. Although its condition assessment is currently not rated, the reservoir remains a vital component of the local water infrastructure. With its strategic location and reliable water storage capacity, Watson Reservoir is an essential resource for maintaining sustainable water supply and irrigation practices in Crook County, Oregon.

Year Completed

1970

Dam Length

900

Dam Height

32

River Or Stream

WATSON CREEK

Primary Dam Type

Earth

Surface Area

103.6

Hydraulic Height

30

Drainage Area

22.4

Nid Storage

2102

Structural Height

34

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Nid Height

34
       
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.