Crain Reservoir Report
Nearby: Murphy Haines Stock
Last Updated: December 17, 2025
Crain is a privately owned irrigation dam located in Johnson, Wyoming, along the Mid Fork of Trabing Dry Creek.
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Summary
Built in 1958, this Earth dam stands at a height of 20 feet and has a storage capacity of 400 acre-feet, with a normal storage level of 220 acre-feet. The dam covers a surface area of 36 acres and has a drainage area of 2.3 square miles, with a maximum discharge capacity of 655 cubic feet per second.
With a low hazard potential and fair condition assessment, Crain poses a moderate risk level of 3. The dam features an uncontrolled spillway with a width of 105 feet and utilizes a slide (sluice gate) outlet gate for water release. While the dam is state-regulated and undergoes regular inspections, its last inspection in July 2021 indicated a need for continued monitoring and maintenance to ensure its safety and functionality in the face of changing climate conditions. Enthusiasts of water resources and climate change will find Crain to be an intriguing structure that highlights the importance of sustainable dam management in the context of evolving environmental challenges.
Year Completed |
1958 |
Dam Length |
588 |
Dam Height |
20 |
River Or Stream |
MID FORK OF TRABING DRY CREEK |
Primary Dam Type |
Earth |
Surface Area |
36 |
Hydraulic Height |
15 |
Drainage Area |
2.3 |
Nid Storage |
400 |
Structural Height |
20 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
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.
Crain