Ulmer Lake Reservoir Report
Nearby: Standish #1 Hanson Co #5
Last Updated: December 6, 2025
Ulmer Lake, located in Rosebud County, Montana, is a privately owned water resource designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1953, this earth dam stands at a height of 20 feet and has a storage capacity of 1464 acre-feet, with a normal storage level of 750 acre-feet. The dam, situated on TR-Little Porcupine Creek, serves as a vital resource for the local community, with a low hazard potential and a moderate risk assessment rating.
Managed by the DNRC, Ulmer Lake is equipped with an uncontrolled spillway, 500 feet wide, capable of discharging up to 2200 cubic feet per second. The dam's primary purpose, along with its construction design and maintenance, reflects a commitment to ensuring water security and environmental sustainability in the region. Although the condition assessment is currently not rated, the lake continues to play a crucial role in water management and climate resilience efforts in the area.
With its strategic location and essential functions, Ulmer Lake serves as a key component of water resource management in Congressional District 00, Montana. The dam's significance lies not only in its practical applications for fire protection and livestock but also in its contribution to the overall ecosystem health and water conservation efforts in the region. As climate change impacts continue to threaten water resources, Ulmer Lake stands as a testament to the importance of sustainable water infrastructure and proactive risk management strategies in addressing the challenges ahead.
Year Completed |
1953 |
Dam Length |
600 |
Dam Height |
20 |
River Or Stream |
TR-LITTLE PORCUPINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
4.22 |
Nid Storage |
1464 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Ulmer Lake