Sherwood Creek Reservoir Reservoir Report

Last Updated: December 6, 2025

Sherwood Creek Reservoir, located in Crook, Oregon, is a privately owned dam constructed in 1965 primarily for irrigation purposes.


°F

°F

mph

Wind

%

Humidity

Summary

The rockfill dam stands at 27 feet high and spans 340 feet in length, with a storage capacity of 38 acre-feet. Situated on Sherwood Creek, the reservoir covers 3.65 acres and services a drainage area of 8.5 square miles, with a maximum discharge capacity of 125 cubic feet per second.

Despite its low hazard potential, Sherwood Creek Reservoir is regulated by the Oregon Water Resources Department and undergoes regular inspections, with the last one conducted in March 2020. The dam features a slide (sluice gate) outlet gate and is located in a picturesque setting just 5 miles from the city of Post. While the condition of the dam is currently not rated, its emergency action plan status and risk assessment measures are not documented, suggesting potential areas for improvement in emergency preparedness and risk management. For water resource and climate enthusiasts, Sherwood Creek Reservoir offers a fascinating example of a privately owned irrigation reservoir in a rural Oregon setting, with opportunities for further exploration and research into its operational and regulatory aspects.

Year Completed

1965

Dam Length

340

Dam Height

27

River Or Stream

SHERWOOD CREEK

Primary Dam Type

Rockfill

Surface Area

3.65

Hydraulic Height

24

Drainage Area

8.5

Nid Storage

38

Structural Height

27

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Nid Height

27
       
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.