Johnson 41-23-4377 Reservoir Report
Nearby: Anaheim Enl. Johnson 34-4-4377
Last Updated: December 8, 2025
Johnson 41-23-4377 is a privately owned dam located in Johnson, Wyoming, along Little Bulwacker Creek.
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Summary
Designed by Megan Crow and completed in 2005, this earth dam stands at a height of 20 feet and has a storage capacity of 164 acre-feet. With a normal storage capacity of 89 acre-feet and a maximum discharge of 3033 cubic feet per second, this dam serves purposes such as fire protection, stock watering, and small fish pond maintenance.
Despite being a low hazard potential structure with fair condition assessment, Johnson 41-23-4377 is regulated and inspected by the state of Wyoming, with enforcement measures in place. The dam features an uncontrolled spillway with a width of 130 feet and an outlet gate valve. With a surface area of 15.02 acres and a drainage area of 10.66 square miles, this dam plays a crucial role in water resource management in the region. Water resource and climate enthusiasts will appreciate the moderate risk assessment of this dam and the measures in place to ensure its safety and functionality.
Year Completed |
2005 |
Dam Length |
537 |
Dam Height |
20 |
River Or Stream |
LITTLE BULWACKER CREEK |
Primary Dam Type |
Earth |
Surface Area |
15.02 |
Hydraulic Height |
15 |
Drainage Area |
10.66 |
Nid Storage |
164 |
Structural Height |
29 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
29 |
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.
Johnson 41-23-4377
Powder River (Cantonment Reno)