Mather #2 Reservoir Report
Nearby: Fillafer #1 Grimes Dam
Last Updated: December 6, 2025
Mather #2 is a privately owned earthen dam located in Kinsey, Montana, along Grimes Creek.
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Summary
Built in 1940, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 18 feet and a length of 782 feet, Mather #2 has a storage capacity of 157 acre-feet, with a normal storage level of 74 acre-feet.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Mather #2 is regulated and permitted by the state. Despite being categorized as a low hazard potential structure, the dam's condition assessment is currently listed as "Not Rated." The dam has not been inspected recently, and there is no emergency action plan in place. The risk assessment and management measures for Mather #2 are also not documented.
Located in a picturesque setting in Custer County, Montana, Mather #2 is a vital water resource structure in the region. With its historical significance and multiple uses, the dam plays a crucial role in providing water for firefighting, livestock, and recreational activities. However, with the lack of recent inspections and emergency preparedness, ensuring the safety and integrity of Mather #2 remains a priority for water resource and climate enthusiasts in the area.
Year Completed |
1940 |
Dam Length |
782 |
Dam Height |
18 |
River Or Stream |
GRIMES CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
157 |
Hazard Potential |
Low |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yellowstone River At Miles City Mt
|
8100cfs |
Tongue River At Miles City Mt
|
263cfs |
Pumpkin Creek Near Miles City Mt
|
0cfs |
Powder River Near Locate Mt
|
231cfs |
Yellowstone River At Forsyth Mt
|
5430cfs |
Redwater River At Circle Mt
|
1cfs |
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.
Mather #2