Development No. 2 Dam Reservoir Report

Last Updated: December 13, 2025

Development No.


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Summary

2 Dam, also known as Bull Run Reservoir No. 2, is a rockfill dam located in Troutdale, Oregon, on the Bull Run River. Built in 1962 by Stevens & Thompson of Portland, OR, this impressive structure stands at a height of 145 feet and has a hydraulic height of 130 feet. The dam serves primarily as a water supply source, with a storage capacity of 25,000 acre-feet and a normal storage capacity of 21,000 acre-feet.

With a spillway width of 450 feet and a maximum discharge capacity of 69,000 cubic feet per second, Development No. 2 Dam is equipped to handle high hazard potential situations. The dam covers a surface area of 418 acres and is associated with one other structure. Despite its age, the dam's risk assessment is moderate, with a DSAC assigned date yet to be determined. Overall, Development No. 2 Dam stands as a critical piece of infrastructure for water supply and management in the region, showcasing the importance of sustainable water resource development in the face of changing climate conditions.

Year Completed

1962

Dam Length

900

Dam Height

145

River Or Stream

Bull Run River

Primary Dam Type

Rockfill

Surface Area

418

Hydraulic Height

130

Drainage Area

102

Nid Storage

25000

Structural Height

145

Hazard Potential

High

Foundations

Rock

Nid Height

145
       
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.