Lance Creek No. 1 Reservoir Report
Nearby: Lance Creek No. 2 Bliss No. 1
Last Updated: December 13, 2025
Located in the heart of the Lance Creek Oil Field in Wyoming, Lance Creek No.
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Summary
1 is a private earth dam built in 1965 primarily for irrigation purposes. With a structural height of 26 feet and a hydraulic height of 21 feet, this dam spans 632 feet in length and has a storage capacity of 195 acre-feet. Despite its low hazard potential, the dam's condition assessment in 2018 revealed a poor state, prompting concerns about its long-term stability and effectiveness.
The dam features an uncontrolled spillway with a width of 105 feet and a single slide (sluice gate) outlet gate. While it has undergone periodic inspections, the last one conducted in 2018 raised alarms about its deteriorating condition. With a moderate risk assessment rating of 3, there is a pressing need for risk management measures to be implemented to ensure the safety and functionality of Lance Creek No. 1. Water resource and climate enthusiasts monitoring this site should stay informed about any updates regarding its maintenance and potential improvements to mitigate risks associated with its current state.
Year Completed |
1965 |
Dam Length |
632 |
Dam Height |
26 |
River Or Stream |
LANCE CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
21 |
Nid Storage |
195 |
Structural Height |
26 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
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.
Lance Creek No. 1