Patrick Stock Reservoir Report
Nearby: Andrus Enl. Johnson 34-4-4377
Last Updated: December 13, 2025
Patrick Stock is a private earth dam located in Johnson, Wyoming, along the Andrews Draw river.
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Summary
Built in 1956, this dam serves multiple purposes including fire protection, stock, and small fish pond management. With a structural height of 33 feet and a hydraulic height of 28 feet, Patrick Stock has a storage capacity of 25 acre-feet and a surface area of 2 acres.
Despite its low hazard potential and fair condition assessment, Patrick Stock is regulated by the Wyoming State Engineer's Office and undergoes regular inspections every five years. The dam features an uncontrolled spillway with a width of 12 feet, and its emergency action plan status and risk assessment are currently listed as unknown. The surrounding area is at a moderate risk level, requiring ongoing monitoring and risk management measures.
Located in Congressional District 00 of Wyoming, Patrick Stock presents an intriguing case study for water resource and climate enthusiasts. With its historical significance, multiple functions, and regulatory oversight, this private earth dam serves as a reminder of the critical role that infrastructure plays in managing water resources and mitigating environmental risks in the region.
Year Completed |
1956 |
Dam Length |
320 |
Dam Height |
33 |
River Or Stream |
ANDREWS DRAW |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
28 |
Nid Storage |
25 |
Structural Height |
33 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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.
Patrick Stock
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