Greely Dam Reservoir Report

Last Updated: December 13, 2025

Greely Dam, located in Malheur, Oregon, is a Federal-owned structure managed by the Bureau of Land Management.


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Summary

Completed in 2004, this gravity dam serves the primary purpose of flood risk reduction along the TRIB ROCK CREEK. With a height of 11 feet and a length of 464 feet, the dam has a storage capacity of 297 acre-feet, providing essential protection to the surrounding area.

Despite its low hazard potential, Greely Dam undergoes inspections every five years to ensure its structural integrity and safety. The dam, designed by the Bureau of Land Management, plays a crucial role in safeguarding the region from potential flooding events. With its stone and buttress core types, Greely Dam stands as a testament to effective water resource management and climate resilience efforts in the area.

Overall, Greely Dam is a vital asset in the flood risk reduction infrastructure of Oregon. As a gravity dam constructed and managed by the Bureau of Land Management, it reflects the commitment to protecting the community and environment from potential water-related hazards. With its efficient design and operational oversight, Greely Dam exemplifies the importance of proactive measures in ensuring water resource sustainability and climate adaptation in the region.

Year Completed

2004

Dam Length

464

River Or Stream

TRIB ROCK CREEK

Primary Dam Type

Gravity

Hydraulic Height

11

Nid Storage

297

Structural Height

11

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

11
       
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.