Mill #4 Tailings #2 Dam Reservoir Report
Last Updated: December 13, 2025
Mill #4 Tailings #2 Dam, located in Eureka, Nevada, is a privately owned earth dam designed by Knight Piesold & Company for the primary purpose of storing tailings.
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Summary
Completed in 1993, this dam stands at a height of 165 feet and has a storage capacity of 8,264 acre-feet. With a fair condition assessment and significant hazard potential, it is crucial for the Nevada Department of Water Resources to regularly inspect and enforce regulations to ensure the safety and integrity of the structure.
The dam, situated on Rodeo Creek in the Sacramento District, has undergone structural modifications in 1993, 1995, and 1997. Despite not having a spillway, it is equipped with one other controlled outlet gate. The dam has a maximum discharge rate of 2 cubic feet per second and covers a surface area of 50 acres, serving a drainage area of 0.1 square miles. With a risk assessment rating of high and a congressional district representation by Mark E. Amodei, the dam's risk management measures and emergency action plan preparedness are critical aspects to consider for water resource and climate enthusiasts.
Overall, Mill #4 Tailings #2 Dam presents a unique challenge due to its significant hazard potential and high risk assessment level. As a privately owned structure regulated by the Nevada Department of Water Resources, it is essential for the dam to be regularly inspected and maintained to mitigate any potential risks to downstream communities and the environment. With a clear understanding of its design, purpose, and associated risks, water resource and climate enthusiasts can appreciate the complexities involved in managing and ensuring the safety of such critical infrastructure.
Years Modified |
1993 - Structural, 1995 - Structural, 1997 - Structural |
Year Completed |
1993 |
Dam Length |
8100 |
Dam Height |
165 |
River Or Stream |
RODEO CREEK-OS |
Primary Dam Type |
Earth |
Surface Area |
50 |
Hydraulic Height |
162 |
Drainage Area |
0.1 |
Nid Storage |
8264 |
Structural Height |
165 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Significant |
Foundations |
Rock, Soil |
Nid Height |
165 |
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.
Mill #4 Tailings #2 Dam