Steffenson No. 2 Reservoir Report
Nearby: Steffensen Dry Poison Irrigation
Last Updated: December 13, 2025
Steffenson No.
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Summary
2, located in Johnson, Wyoming, is an earth dam constructed in 1971 primarily for irrigation purposes on Billy Creek. Standing at a height of 41 feet with a hydraulic height of 37 feet, this dam boasts a storage capacity of 182 acre-feet, making it a crucial water resource in the region. Despite its low hazard potential and fair condition assessment, the dam is subject to regular state inspection, regulation, and enforcement to ensure its continued safety and functionality.
Owned privately, Steffenson No. 2 has a spillway width of 50 feet and an uncontrolled spillway type. With a surface area of 10 acres and a drainage area of 0, the dam plays a key role in water management and agricultural activities in the Arvada area. The dam's emergency action plan status and risk assessment are currently moderate, indicating a need for ongoing monitoring and risk management measures to safeguard against potential hazards and ensure the community's safety and water resource sustainability.
As a vital component of the water infrastructure in Wyoming, Steffenson No. 2 serves as a lifeline for irrigation and agricultural needs in the region. With its stone core and soil foundation, the dam has been a reliable resource since its completion, providing essential water storage and management capabilities. Regular inspections, fair condition assessment, and moderate risk assessment underscore the importance of continued monitoring and maintenance to preserve the functionality and safety of this essential water resource for the community and the environment.
Year Completed |
1971 |
Dam Length |
930 |
Dam Height |
41 |
River Or Stream |
BILLY CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
37 |
Nid Storage |
182 |
Structural Height |
41 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
41 |
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 |
|---|---|---|
Canyon Campground
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Muddy Guard Cabin
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Crazy Woman Campground
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Lost Cabin Campground
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Lost Cabin
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Pole Creek Cabin
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Steffenson No. 2