Pond R1 Reservoir Report
Last Updated: December 5, 2025
Pond R1 is a private earth dam located in Big Horn, Montana, with a capacity of 124 acre-feet and a maximum storage of 124 acre-feet.
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Summary
Built in 1989, this structure serves a primary purpose of "Other" and has a low hazard potential. The dam stands at a height of 40 feet with a hydraulic height of 34 feet and a length of 1000 feet, creating a surface area of 176 acres along the TR-Tongue River.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Pond R1 is regulated, permitted, inspected, and enforced by the state agency. Despite being classified as "Not Rated" in terms of condition assessment, the dam's risk potential is considered low. While no emergency action plan (EAP) or inundation maps have been prepared to date, the structure meets state guidelines and is closely monitored by state authorities.
Water resource and climate enthusiasts will find Pond R1 an intriguing case study, showcasing the importance of private dams in water management and conservation efforts. As a key component of the local watershed, this earth dam plays a crucial role in providing water storage and flood control along the TR-Tongue River. Its construction, maintenance, and regulatory oversight offer valuable insights into the complexities of managing water resources in Montana and beyond.
Year Completed |
1989 |
Dam Length |
1000 |
Dam Height |
40 |
River Or Stream |
TR-TONGUE RIVER |
Primary Dam Type |
Earth |
Surface Area |
176 |
Hydraulic Height |
34 |
Nid Storage |
124 |
Hazard Potential |
Low |
Nid Height |
40 |
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.
Pond R1