Mattingly Reservoir Report
Nearby: Picard Reservoir Andy Capp
Last Updated: December 14, 2025
Mattingly, a privately owned dam located in Roosevelt County, Montana, serves multiple purposes including fire protection, stock maintenance, and small fish pond preservation.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1949, this earth dam stands at a height of 17 feet with a storage capacity of 64 acre-feet. Situated on TR-Sand Creek, Mattingly plays a crucial role in maintaining the ecological balance of the area while also providing essential resources for the local community.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Mattingly is regulated, inspected, and enforced by the state to ensure its structural integrity and safety. With a low hazard potential and a condition assessment of "Not Rated," the dam is considered to be in relatively good condition. Despite lacking recent inspection data, Mattingly remains a key feature in the region's water resource management efforts, contributing to the overall sustainability of the watershed.
While Mattingly may not be a well-known landmark, its significance in providing water for firefighting, livestock, and wildlife habitats cannot be understated. As climate change continues to impact water resources, dams like Mattingly play a vital role in ensuring the resilience of ecosystems and communities in the face of evolving environmental challenges. By understanding and appreciating the importance of structures like Mattingly, water resource and climate enthusiasts can advocate for sustainable water management practices that benefit both people and the planet.
Year Completed |
1949 |
Dam Length |
150 |
Dam Height |
17 |
River Or Stream |
TR-SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
13 |
Nid Storage |
64 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Mattingly