Lamb Upper Reservoir Report
Nearby: Lamb Lower Agnes
Last Updated: December 16, 2025
Lamb Upper, located in the Big Muddy Oil Field in Converse, Wyoming, is a privately-owned earth dam completed in 1953 for irrigation purposes.
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Summary
With a height of 28 feet and a length of 280 feet, the dam stores a maximum of 171 acre-feet of water from Brushy Draw and TR East Muddy Creek, covering a surface area of 14 acres. Despite its low hazard potential, Lamb Upper is in poor condition as of the last inspection in 2017, with an inspection frequency of 5 years.
The dam's spillway type is uncontrolled, with a width of 12 feet, and it has one valve as the outlet gate. Although the risk assessment categorizes Lamb Upper as having moderate risk, there are no specific risk management measures or emergency action plans documented for the structure. Over the years, the dam has not undergone any significant modifications or improvements, raising concerns about its long-term safety and stability in the face of changing climate conditions and water resource management challenges.
For water resource and climate enthusiasts, Lamb Upper presents an opportunity to explore the intersection of aging dam infrastructure, irrigation needs, and environmental risk mitigation. As discussions around dam safety and resilience continue to evolve, the case of Lamb Upper serves as a reminder of the importance of proactive maintenance, emergency preparedness, and holistic risk management strategies in safeguarding water resources and communities in the face of a changing climate.
Year Completed |
1953 |
Dam Length |
280 |
Dam Height |
28 |
River Or Stream |
BRUSHY DRAW, TR EAST MUDDY CRK |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
22 |
Drainage Area |
0.8 |
Nid Storage |
171 |
Structural Height |
27 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
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Lodge Pole
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Rim Campsite 8
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Rim Campsite 6
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Rim Campsite 7
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Rim Campsite 5
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Rim
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Lamb Upper
Deer Creek