Leach No. 1 Stock Reservoir Report
Nearby: Provost No. 2 Water Storage
Last Updated: December 7, 2025
Leach No.
°F
°F
mph
Wind
%
Humidity
Summary
1 Stock is a privately owned earth dam located on Leach Creek in Niobrara, Wyoming. Completed in 1961, this dam serves multiple purposes including fire protection, stock, and small fish pond maintenance. With a height of 25 feet and a length of 425 feet, the dam has a storage capacity of 73 acre-feet and a surface area of 7 acres. Despite its low hazard potential, the dam is currently in poor condition as of the last inspection in May 2017.
The dam's hydraulic height is 20 feet, with a structural height of 30 feet. It features an uncontrolled spillway with a width of 70 feet and an uncontrolled outlet gate. The risk assessment for Leach No. 1 Stock has been rated as moderate, with a risk level of 3 out of 5. While the dam is state regulated and receives regular inspections, its condition assessment raises concerns about its long-term viability and safety. Climate and water resource enthusiasts may find Leach No. 1 Stock an interesting case study in dam management and maintenance practices.
Year Completed |
1961 |
Dam Length |
425 |
Dam Height |
25 |
River Or Stream |
LEACH CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
20 |
Nid Storage |
73 |
Structural Height |
30 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
Leach No. 1 Stock