No. 3 Tailings Reservoir Report
Last Updated: December 13, 2025
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Summary
3 Tailings, located in Green River, Wyoming, is a privately owned tailings dam designed by Wayne L. Johnson and regulated by the Wyoming State Engineer's Office. Completed in 1980, this earth dam stands at a height of 19 feet and has a storage capacity of 140 acre-feet. The dam, constructed on the Left Fork Stevens Draw, serves the primary purpose of storing tailings and has a low hazard potential with fair condition assessment.
Despite its low hazard potential, No. 3 Tailings poses a high risk due to its location and potential impact on the surrounding area. The dam has a drainage area of 0.1 square miles and a maximum discharge of 5 cubic feet per second. With a surface area of 14 acres and a length of 650 feet, the dam is inspected every 5 years to ensure its structural integrity and safety. While it currently meets guidelines and has adequate emergency contacts, there is room for improvement in risk management measures and the development of inundation maps.
As water resource and climate enthusiasts monitor the condition of No. 3 Tailings, it is crucial to stay informed about any updates or changes to its risk assessment and emergency action plan. With its proximity to the Left Fork Stevens Draw and the potential implications of a dam failure, continued vigilance and maintenance of this structure are essential to mitigating risks and ensuring the safety of the community and environment.
Year Completed |
1980 |
Dam Length |
650 |
Dam Height |
19 |
River Or Stream |
LEFT FORK STEVENS DRAW |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
15 |
Drainage Area |
0.1 |
Nid Storage |
140 |
Structural Height |
23 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
No. 3 Tailings