Trail Bridge Reservoir Report

Last Updated: December 13, 2025

Trail Bridge, located in McKenzie Bridge, Oregon, is a captivating hydroelectric structure designed by the Bechtel Corporation and completed in 1963.


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Summary

This Earth dam stands at an impressive height of 90 feet with a hydraulic height of 80 feet, serving as a vital component for both hydroelectric power generation and recreational activities. With a storage capacity of 2,263 acre-feet and a maximum discharge of 29,000 cubic feet per second, Trail Bridge plays a crucial role in water resource management within the McKenzie River watershed.

Owned by a public utility and regulated by the Federal Energy Regulatory Commission, Trail Bridge boasts a controlled spillway and a Tainter (radial) outlet gate for effective water flow control and safety measures. The dam's hazard potential is classified as high, with a risk assessment rating of very high, highlighting the importance of regular inspections and emergency preparedness. Despite its age, Trail Bridge continues to be a key infrastructure asset in ensuring water supply resilience and energy sustainability in the region.

Trail Bridge stands as a testament to human ingenuity and engineering excellence, blending seamlessly into the natural landscape while harnessing the power of water for multiple purposes. As climate change and water scarcity pose increasing challenges, structures like Trail Bridge play a crucial role in mitigating risks and adapting to a rapidly evolving environment. With its rich history, technical specifications, and strategic location in the heart of Oregon's water resources, Trail Bridge remains a symbol of resilience and innovation in the face of changing climates and growing energy demands.

Year Completed

1963

Dam Length

700

Dam Height

90

River Or Stream

McKenzie River

Primary Dam Type

Earth

Surface Area

73.4

Hydraulic Height

80

Drainage Area

184

Nid Storage

2263

Structural Height

90

Outlet Gates

Tainter (radial) - 1

Hazard Potential

High

Foundations

Rock

Nid Height

90
       
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.