Big Delaney Reservoir Report
Last Updated: December 5, 2025
Big Delaney is a privately owned earth dam located in the Skull Creek Oil Field in Weston, Wyoming.
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Summary
Built in 1970 by designer James T Fletcher, this structure serves the primary purpose of irrigation for the surrounding area. The dam stands at a height of 25 feet with a hydraulic height of 20 feet and a length of 235 feet, providing a storage capacity of 45 acre-feet.
Despite its age, Big Delaney is in fair condition with a low hazard potential according to the last inspection in 2017. The dam features an uncontrolled spillway and a single slide gate outlet. It is regulated, permitted, inspected, and enforced by the Wyoming State Engineer's Office, ensuring its safety and compliance with state standards. With a moderate risk assessment rating, Big Delaney remains a vital water resource for the region, contributing to the sustainability of the local ecosystem and agriculture.
Year Completed |
1970 |
Dam Length |
235 |
Dam Height |
25 |
River Or Stream |
WELL DRAW |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
20 |
Nid Storage |
45 |
Structural Height |
25 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
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.
Big Delaney