Helen Reservoir Report
Nearby: Buck Pasture Werner Ranch Site
Last Updated: December 25, 2025
Helen is a privately owned earthen dam located in Converse, Wyoming, along Co.
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Summary
Rd. 43. Completed in 1966, this structure serves the primary purpose of flood risk reduction and has a height of 22 feet with a hydraulic height of 16 feet. The dam holds a total storage capacity of 83 acre-feet, with a normal storage level of 41 acre-feet and a surface area of 7 acres.
The dam is situated on Little Ltng. Creek, a tributary of Lance, and is regulated by the State of Wyoming, with state permitting, inspection, and enforcement in place. Helen has a low hazard potential and is currently assessed to be in fair condition as of the last inspection in May 2018. The spillway type is uncontrolled, with a width of 50 feet, and there is one other controlled outlet gate. While the risk assessment for Helen is moderate, measures for risk management and emergency preparedness are not specified in the available data.
Year Completed |
1966 |
Dam Length |
400 |
Dam Height |
22 |
River Or Stream |
LITTLE LTNG. CREEK,TRIB LANCE |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
16 |
Nid Storage |
83 |
Structural Height |
22 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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.
Helen