Enl. Johnson 34-4-4377 Reservoir Report
Nearby: Anaheim Johnson 41-23-4377
Last Updated: December 8, 2025
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Summary
Johnson 34-4-4377 is a privately owned irrigation dam located in Johnson, Wyoming, near the city of Irving Sheep Camp. Built in 2006 by designer Megan Crow, this earth dam stands at a height of 25 feet and has a storage capacity of 106 acre-feet. The dam serves multiple purposes including fire protection, stock watering, and maintaining a small fish pond, in addition to irrigation.
With a spillway width of 110 feet and a maximum discharge of 3754 cubic feet per second, Enl. Johnson 34-4-4377 is equipped to handle potential overflow events. The dam has a low hazard potential and was assessed to be in fair condition during its last inspection in September 2018. The risk assessment for the dam is moderate (3), indicating a need for ongoing monitoring and risk management measures to ensure its safety and functionality.
Enl. Johnson 34-4-4377 plays a crucial role in water resource management in the area, providing essential irrigation water for agricultural activities. Its strategic location on Big Bullwhacker Creek contributes to the overall water supply and ecosystem health in the region. Enthusiasts of water resources and climate will find this dam an interesting example of sustainable water infrastructure supporting local communities while managing potential risks associated with dam operations.
Year Completed |
2006 |
Dam Length |
368 |
Dam Height |
25 |
River Or Stream |
BIG BULLWHACKER CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.68 |
Hydraulic Height |
18 |
Drainage Area |
18.66 |
Nid Storage |
106 |
Structural Height |
35 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
35 |
Seasonal Comparison
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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.
Enl. Johnson 34-4-4377
Powder River (Cantonment Reno)