Standish #1 Reservoir Report
Nearby: Hanson Co #5 Ulmer Lake
Last Updated: December 6, 2025
Standish #1 is a privately owned earth dam located in Rosebud, Montana, specifically in the TR-Little Porcupine Creek watershed.
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Summary
Built in 1955 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 18 feet and a length of 200 feet, the dam has a storage capacity of 180 acre-feet, with a normal storage level of 104 acre-feet. It also has a spillway width of 20 feet and a maximum discharge capacity of 180 cubic feet per second.
Despite being categorized as having a low hazard potential, Standish #1 is subject to state regulations and inspections by the Montana DNRC. The dam is designed to protect against moderate risks, with a risk level of 3 out of 5. While the condition of the dam is currently unrated, it is still subject to state enforcement and state permitting requirements. The dam does not have an Emergency Action Plan in place, but it meets state guidelines and is maintained to ensure the safety of the surrounding community and environment.
Year Completed |
1955 |
Dam Length |
200 |
Dam Height |
18 |
River Or Stream |
TR-LITTLE PORCUPINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Drainage Area |
0.56 |
Nid Storage |
180 |
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.
Standish #1