Marlew #2 Reservoir Report
Nearby: Depression Detention Dam Drum No 2
Last Updated: December 5, 2025
Marlew #2, located in Carbon County, Montana, is a privately owned earth dam designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1960, the dam stands at a height of 18 feet with a length of 150 feet, providing a storage capacity of 137 acre-feet. Situated on TR-Sage Creek, this structure serves as a crucial resource for the surrounding area, with a low hazard potential and a condition assessment of "Not Rated."
With the dam falling under the jurisdiction of the Montana DNRC, it is subject to state regulation, permitting, inspection, and enforcement to ensure its continued safe operation. The primary source agency for Marlew #2 is the state of Montana, with support from the Natural Resources Conservation Service for design. Despite not being owned or funded by federal agencies, the dam plays a vital role in water resource management and climate resilience in the region, contributing to fire protection and agricultural needs.
As climate change impacts water availability and increases the frequency of extreme weather events, structures like Marlew #2 become even more critical for maintaining water storage and supply. With the potential for future modifications or enhancements to meet evolving needs and regulations, ongoing monitoring and maintenance of Marlew #2 will be essential to ensuring its continued effectiveness in serving the community and mitigating water-related risks.
Year Completed |
1960 |
Dam Length |
150 |
Dam Height |
18 |
River Or Stream |
TR-SAGE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Drainage Area |
0.55 |
Nid Storage |
137 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Marlew #2
Piney Creek
Bear Creek