Long Horn #4 Reservoir Report
Nearby: Eddie #2 Neufeld No 1
Last Updated: December 19, 2025
Long Horn #4 is a private dam located in Nashua, Montana, along the TR-Middle Fork Porcupine Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1952, this earth dam stands at a height of 16 feet and has a storage capacity of 61 acre-feet, primarily serving the purposes of fire protection, stock, and as a small fish pond. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected regularly to ensure its safety and compliance with state regulations.
Despite being classified as having a low hazard potential, Long Horn #4's condition assessment is currently marked as "Not Rated." The dam's emergency action plan status, risk assessment, and inundation maps preparedness are also undetermined at this time. With a designated inspection frequency and regulatory oversight in place, the dam serves as a crucial component for water resource management in Valley County, Montana. Climate and water enthusiasts can keep an eye on Long Horn #4 as it continues to play a vital role in the local ecosystem.
As a key structure in the Omaha District of the U.S. Army Corps of Engineers, Long Horn #4 contributes to the overall water management efforts in the region. With its primary purpose focused on fire protection and stock usage, the dam serves as a valuable resource for the community. The presence of this earth dam underscores the importance of maintaining and monitoring water infrastructure to ensure a sustainable and resilient water supply for both human and environmental needs in the face of changing climate patterns.
Year Completed |
1952 |
Dam Length |
240 |
Dam Height |
16 |
River Or Stream |
TR-MIDDLE FORK PORCUPINECR |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
61 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Long Horn #4