Barney Reservoir Report

Last Updated: December 13, 2025

Barney, also known as Es Mills Dam, is a crucial water supply infrastructure located in Tillamook, Oregon.


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Summary

This local government-owned structure was completed in 1998 and serves the M. Fork of North Fork Trask River. With a height of 122 feet and a capacity of 20,000 acre-feet, Barney plays a vital role in water management and supply for the region. The dam's spillway type is uncontrolled, and it has a high hazard potential but is currently assessed as satisfactory.

Situated in Washington County, Oregon, Barney has a structural height of 165 feet and a hydraulic height of 110 feet, with a length of 2500 feet. It covers a surface area of 455 acres and has a maximum discharge capacity of 7780 cfs. The dam's primary purpose is water supply, and it is regulated by the Oregon Water Resources Department. Despite its high hazard potential, Barney is monitored and inspected regularly to ensure its safety and functionality for the community it serves.

Barney's emergency action plan status and risk assessment are currently not available, but the dam is considered to have a moderate risk level. With its role in water supply and management, Barney stands as a crucial piece of infrastructure in the region, providing essential services while being closely monitored for any potential risks or hazards. For water resource and climate enthusiasts, Barney presents an intriguing case study in dam management and water infrastructure in the Pacific Northwest.

Year Completed

1998

Dam Length

2500

Dam Height

122

River Or Stream

M. FORK OF NORTH FORK TRASK RIVER

Primary Dam Type

Other

Surface Area

455

Hydraulic Height

110

Drainage Area

8.24

Nid Storage

20000

Structural Height

165

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Nid Height

165
       
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.