Mathilda #1 Reservoir Report
Nearby: Groh Stock Quick (L.)
Last Updated: December 6, 2025
Mathilda #1 is a private earth dam located in Circle, Montana, along Antelope Creek.
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Summary
Completed in 1950, this dam serves multiple purposes including fire protection, stock, and small fish pond. It has a height of 15 feet and a length of 200 feet, with a storage capacity of 155 acre-feet. The dam is considered to have significant hazard potential and is regulated by the Montana Department of Natural Resources and Conservation.
Situated in McCone County, Mathilda #1 is owned privately and is subject to state jurisdiction, regulation, permitting, inspection, and enforcement. The dam is designed to provide essential water resources for various uses, while also being a potential focal point for climate enthusiasts interested in monitoring and studying the impact of dams on local ecosystems and water availability. With its strategic location and purpose, Mathilda #1 plays a crucial role in water management and climate resilience efforts in the region.
As an integral part of the local water infrastructure, Mathilda #1 contributes to the overall water resource management in the area. Climate enthusiasts can follow updates on its condition assessment, emergency action plan, and risk management measures to understand its role in mitigating hazards and ensuring water availability for various stakeholders. The dam's historical significance, coupled with its functional importance, makes it a key site for monitoring and studying the intersection of water resources and climate dynamics in the region.
Year Completed |
1950 |
Dam Length |
200 |
Dam Height |
15 |
River Or Stream |
ANTELOPE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
155 |
Hazard Potential |
Significant |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Redwater River At Circle Mt
|
1cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Yellowstone River At Glendive Mt
|
6000cfs |
Milk River At Nashua Mt
|
233cfs |
Poplar River Near Poplar Mt
|
28cfs |
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.
Mathilda #1