Coulter #1 Reservoir Report
Nearby: Mckeever, Frank #2 Coulter #2
Last Updated: January 8, 2026
Located in Garfield County, Montana, the Coulter #1 dam, completed in 1955, serves multiple purposes including fire protection, stock watering, and small fish pond support.
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Summary
Designed by USDA NRCS, this earth dam standing at 25 feet high and 150 feet long holds a storage capacity of 70 acre-feet with a maximum discharge rate of 150 cubic feet per second. The dam, situated on TR-Snow Creek, falls under the jurisdiction of the Montana Department of Natural Resources and Conservation, ensuring regular inspections and enforcement to maintain its low hazard potential.
With a risk assessment rating of moderate (3), Coulter #1's condition assessment is currently listed as not rated, indicating the need for further evaluation. Despite lacking recent inspection data, the dam's emergency action plan status and compliance with guidelines remain unknown. However, the dam's uncontrolled spillway, 30 feet wide, provides a safety measure for managing excess water flow. As a private structure, Coulter #1 plays a vital role in water resource management within the region, highlighting the importance of ongoing monitoring and maintenance to mitigate potential risks and ensure its continued functionality for the surrounding community's needs.
Year Completed |
1955 |
Dam Length |
150 |
Dam Height |
25 |
River Or Stream |
TR-SNOW CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
0.25 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Musselshell River At Mosby Mt
|
225cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Milk River At Tampico Mt
|
123cfs |
Beaver Cr Bl Guston Coulee Nr Saco Mt
|
67cfs |
Flatwillow Creek Near Mosby Mt
|
17cfs |
Milk River At Nashua Mt
|
233cfs |
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.
Coulter #1