Nuhn #3 Reservoir Report
Nearby: Nuhn #2 Cockran Grazing #1
Last Updated: December 5, 2025
Nuhn #3, located in Carter, Montana, is an earth dam designed by the USDA NRCS for the primary purpose of irrigation.
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Summary
Completed in 1965, this structure stands at a height of 35 feet and has a storage capacity of 194 acre-feet. Situated on TR-South Cottonwood Creek, Nuhn #3 is regulated by the DNRC and undergoes regular inspections to ensure its safety and compliance with state regulations.
With a low hazard potential and a condition assessment of "Not Rated," Nuhn #3 is deemed to be in good standing. The dam features a spillway width of 50 feet and is equipped with outlet gates for water release. Despite not having a designated emergency action plan, this structure meets state guidelines and is continuously monitored for any potential risks or hazards.
As a crucial water resource for the surrounding area, Nuhn #3 plays a vital role in supporting agricultural activities and maintaining water supply in the region. Its efficient design and regulated operation make it a reliable asset for irrigation and water management in Carter, Montana.
Year Completed |
1965 |
Dam Length |
250 |
Dam Height |
35 |
River Or Stream |
TR-SOUTH COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
35 |
Drainage Area |
1.88 |
Nid Storage |
194 |
Hazard Potential |
Low |
Nid Height |
35 |
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.
Nuhn #3