Wildhorse Pasture Reservoir Report
Nearby: Ashenhurst #1 Ashenhurst #2
Last Updated: December 5, 2025
Wildhorse Pasture is a privately owned earth dam located in the picturesque county of Rosebud, Montana.
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Summary
Built in 1970 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a dam height of 20 feet and a storage capacity of 77 acre-feet, it plays a crucial role in water resource management in the area.
Situated along the TR-West Fork Armellus Creek, Wildhorse Pasture provides a low hazard potential but is rated as having a moderate risk due to its condition assessment being marked as "Not Rated." Despite this, the dam is under state regulation and inspection by the DNRC, ensuring its safety and functionality for the surrounding community. The spillway, with a width of 20 feet, is uncontrolled, allowing for excess water to safely flow out when needed.
Wildhorse Pasture is an essential part of the local water infrastructure, offering both practical benefits and a natural habitat for wildlife. With its strategic location and design, this earth dam continues to play a vital role in maintaining water resources and climate resilience in the region, making it a valuable asset for water resource and climate enthusiasts.
Year Completed |
1970 |
Dam Length |
293 |
Dam Height |
20 |
River Or Stream |
TR-WEST FORK ARMELLUS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
1.25 |
Nid Storage |
77 |
Hazard Potential |
Low |
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.
Wildhorse Pasture