Big V Reservoir Report
Nearby: South Wall No. 3 South Wall
Last Updated: December 13, 2025
Big V is a private recreation dam located in Natrona, Wyoming, along the Lone Tree Draw Trib Dead Horse river.
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Summary
Constructed in 1940 by designer Keith A. Neustel, this earth dam stands at 22 feet high and spans 1050 feet in length. With a storage capacity of 131 acre-feet and a surface area of 361 acres, Big V serves the primary purposes of fish and wildlife pond and recreation. The dam has a low hazard potential and fair condition assessment, last inspected in May 2021.
Owned privately, Big V is regulated by the State of Wyoming and falls under the jurisdiction of the State Engineer's Office. The dam features an uncontrolled spillway and an outlet gate for controlled water release. While the risk assessment for Big V is moderate, the dam meets all state permitting, inspection, and enforcement requirements. The surrounding area offers opportunities for outdoor enthusiasts to enjoy fishing, wildlife viewing, and recreational activities in a picturesque setting.
Year Completed |
1940 |
Dam Length |
1050 |
Dam Height |
22 |
River Or Stream |
LONE TREE DRAW TRIB DEAD HORSE |
Primary Dam Type |
Earth |
Surface Area |
361 |
Hydraulic Height |
17 |
Drainage Area |
5.2 |
Nid Storage |
131 |
Structural Height |
22 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
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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.
Big V