Mcninch No. 2 Reservoir Report
Nearby: Mcninch No. 1 Sixty Seven
Last Updated: December 13, 2025
Mcninch No.
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Summary
2, also known as Enl of 5412r, is a privately owned earth dam located in Sublette, Wyoming, specifically in the city of BIG PINEY. Completed in 1957, this dam serves the primary purpose of irrigation along the MCNINCH DRAW river or stream. With a height of 27 feet and a storage capacity of 760 acre-feet, it plays a crucial role in regulating water flow for agricultural purposes in the region. Despite its poor condition assessment as of August 2020, the dam poses a low hazard potential and is classified as a moderate risk for potential issues.
Situated in Congressional District 00, Wyoming, Mcninch No. 2 is regulated by the State Engineer's Office (SEO) and undergoes regular inspections, permitting, and enforcement to ensure its structural integrity and compliance with safety standards. The dam features a slide (sluice gate) outlet gate and an uncontrolled spillway with a width of 20 feet. While it has not been significantly modified over the years, the dam's drainage area of 7.1 square miles and surface area of 43 acres contribute to its vital role in water resource management and climate resilience efforts in the area.
For water resource and climate enthusiasts, Mcninch No. 2 represents a crucial infrastructure element in the region's irrigation system, supporting agricultural activities and water supply management. As a privately owned dam with state jurisdiction and regulation, its maintenance and upkeep are essential for sustaining water availability and mitigating potential risks associated with its condition. With a focus on risk management measures and regular inspections, Mcninch No. 2 plays a significant role in balancing water resource needs and environmental sustainability in Sublette, Wyoming.
Year Completed |
1957 |
Dam Length |
1113 |
Dam Height |
27 |
River Or Stream |
MCNINCH DRAW |
Primary Dam Type |
Earth |
Surface Area |
43 |
Hydraulic Height |
22 |
Drainage Area |
7.1 |
Nid Storage |
760 |
Structural Height |
27 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
New Fork River Near Big Piney
|
295cfs |
Green River Near La Barge
|
681cfs |
Green River At Warren Bridge
|
206cfs |
Fontenelle C Nr Herschler Ranch
|
33cfs |
Smiths Fork Near Border
|
68cfs |
Crow C Nr Fairview Wyo
|
45cfs |
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.
Mcninch No. 2