Flaming Gorge Reservoir Report

Last Updated: December 5, 2025

Flaming Gorge, located in Daggett County, Utah, is a captivating concrete dam on the Green River with a primary purpose of flood risk reduction.


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Summary

Completed in 1963 by the Bureau of Reclamation, this impressive structure stands at a height of 502 feet and spans 1,285 feet in length, holding a maximum storage capacity of 4,003,100 acre-feet. With a surface area of 42,040 acres and a drainage area of 15,000 square miles, Flaming Gorge plays a crucial role in managing water resources in the region.

Beyond its flood control function, Flaming Gorge also serves as a hydroelectric power generator, a recreation destination, and a water supply source. The dam's controlled spillway, with a width of 34 feet, helps regulate water flow and manage potential hazards, leading to a high hazard potential rating. Despite its age, the dam's risk assessment remains at a very high level, emphasizing the importance of ongoing monitoring and maintenance to ensure its structural integrity and safety for surrounding communities. With its scenic location and diverse uses, Flaming Gorge stands as a testament to the vital role of water resource management in sustaining ecosystems and supporting human activities in the face of changing climates.

Year Completed

1963

Dam Length

1285

Dam Height

502

River Or Stream

GREEN RIVER

Primary Dam Type

Concrete

Surface Area

42040

Hydraulic Height

448

Drainage Area

15000

Nid Storage

4003100

Structural Height

502

Hazard Potential

High

Foundations

Rock

Nid Height

502
       
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.