Mcintosh No. 1 Reservoir Report
Nearby: Mcintosh No.2 Enlargement Rock
Last Updated: December 13, 2025
Mcintosh No.
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Summary
1 is a privately owned earth dam located in Fremont, Wyoming, along the Sheehan Springs Draw. Completed in 1979, this dam stands at a height of 80 feet and has a storage capacity of 611 acre-feet, with a surface area of 26 acres. The primary purpose of this structure is for tailings management, making it a crucial resource for environmental protection and water management in the region.
Despite its low hazard potential, Mcintosh No. 1 is in poor condition and has not been adequately assessed or maintained in recent years. With a moderate risk assessment rating, there is a pressing need for inspection and rehabilitation to ensure the safety and integrity of this dam. The dam's spillway, although uncontrolled, has a width of 85 feet, providing some level of flood protection, but a more comprehensive risk management plan is needed to address the current state of disrepair.
Located in a critical area for water resources and climate considerations, Mcintosh No. 1 serves as a reminder of the importance of regular inspection and maintenance for dam infrastructure. As water resource and climate enthusiasts, it is imperative to advocate for the proper management and upkeep of such structures to prevent potential environmental disasters and ensure the long-term sustainability of water systems in the region.
Year Completed |
1979 |
Dam Length |
1300 |
Dam Height |
80 |
River Or Stream |
SHEEHAN SPRINGS DRAW |
Primary Dam Type |
Earth |
Surface Area |
26 |
Hydraulic Height |
70 |
Nid Storage |
611 |
Structural Height |
80 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
80 |
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.
Mcintosh No. 1