Windmill Wash Detention Basin Dam Reservoir Report
Last Updated: December 15, 2025
The Windmill Wash Detention Basin Dam, also known as the Bunkerville Flood Control Detention Basin, is a critical infrastructure owned by the local government in Bunkerville, Nevada.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1999, this earth dam stands at a height of 55 feet, with a hydraulic height of 46 feet and a structural height of 64 feet. Its primary purpose is flood risk reduction along the Virgin River, with a capacity to store 500 acre-feet of water and a maximum discharge of 34,900 cubic feet per second.
Located in Clark County, Nevada, this dam covers a surface area of 20 acres and serves a drainage area of 8.4 square miles. With an uncontrolled spillway width of 400 feet and one uncontrolled outlet gate, it is designed to manage high hazard potential events while maintaining a fair condition assessment. Despite its risk assessment rating of moderate, the Windmill Wash Detention Basin Dam plays a crucial role in the flood control measures for the region, operated and regulated by the Nevada Division of Water Resources. For water resource and climate enthusiasts, this dam represents a key piece of infrastructure in safeguarding the community against potential flooding events.
Year Completed |
1999 |
Dam Length |
2040 |
Dam Height |
55 |
River Or Stream |
VIRGIN RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
20 |
Hydraulic Height |
46 |
Drainage Area |
8.4 |
Nid Storage |
500 |
Structural Height |
64 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
64 |
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.
Windmill Wash Detention Basin Dam
Virgin River