Enl. Johnson 42-27-4377 Reservoir Report
Last Updated: December 8, 2025
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Summary
Johnson 42-27-4377, located in Johnson, Wyoming, is a privately owned earth dam primarily designed for fire protection, stock, and small fish pond purposes. Situated on the Little Bullwhacker Draw river/stream, this dam stands at a height of 18 feet with a hydraulic and structural height of 19 and 24 feet, respectively. With a storage capacity of 93 acre-feet and a surface area of 7 acres, this dam plays a crucial role in providing water for various uses in the area.
Despite being classified as having a low hazard potential and fair condition assessment, Enl. Johnson 42-27-4377 is regularly inspected every five years to ensure its safety and functionality. The dam features a valve outlet gate and an uncontrolled spillway with a width of 19 feet. In the event of an emergency, it is important for the owners to have an Emergency Action Plan (EAP) in place to mitigate any potential risks associated with the dam.
With a moderate risk assessment rating, Enl. Johnson 42-27-4377 serves as a vital water resource infrastructure in the region. As climate change continues to impact water availability and quality, it is essential for stakeholders to monitor and maintain dams like this one to ensure the sustainability of water resources for future generations.
Dam Length |
450 |
Dam Height |
18 |
River Or Stream |
LITTLE BULLWHACKER DRAW |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
19 |
Drainage Area |
1.1 |
Nid Storage |
93 |
Structural Height |
24 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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.
Enl. Johnson 42-27-4377
Powder River (Cantonment Reno)