Lampman Reservoir Report
Nearby: Bill Leavitt Reservoir Perkins
Last Updated: December 5, 2025
Lampman, located in Big Horn, Wyoming, is a federally owned dam primarily used for fire protection, stock watering, and as a small fish pond.
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Summary
The earth dam stands at a height of 25 feet and has a hydraulic height of 20 feet, with a length of 350 feet. Its primary purpose is to store water for various needs, with a storage capacity of 45 acre-feet and a surface area of 3.9 acres. The dam is situated on the Redwood Draw river/stream and is regulated by the state of Wyoming, ensuring proper inspection, permitting, and enforcement measures are in place.
Despite being classified as having low hazard potential, Lampman has a fair condition assessment and undergoes inspection every 5 years to assess its safety and structural integrity. The dam's spillway is uncontrolled, with a width of 40 feet, allowing for the safe release of excess water. The risk assessment for Lampman is moderate, indicating a level 3 risk, with no specific risk management measures or inundation maps prepared at this time. Overall, Lampman serves as a vital water resource for fire protection and livestock in the area, highlighting the importance of proper maintenance and regulatory oversight for the dam.
Dam Length |
350 |
Dam Height |
25 |
River Or Stream |
REDWOOD DRAW |
Primary Dam Type |
Earth |
Surface Area |
3.9 |
Hydraulic Height |
20 |
Nid Storage |
45 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bighorn River At Basin
|
996cfs |
Shell Creek Near Shell
|
74cfs |
Shell Creek Above Shell Creek Reservoir
|
13cfs |
Bighorn River At Kane
|
1340cfs |
Bighorn R At Worland Wyo
|
4350cfs |
Shoshone River Near Lovell
|
460cfs |
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.
Lampman
Trapper Creek