Norman #4 (Fergus) Reservoir Report
Nearby: Norman #2 Stone Ranch Dam
Last Updated: December 5, 2025
Norman #4 (Fergus) is a private irrigation dam located in Fergus, Montana, along Plum Creek.
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Summary
Built in 1945 by the USDA NRCS, this earth dam stands at a height of 20.6 feet and spans 1060 feet in length. With a storage capacity of 101 acre-feet, it serves the primary purpose of irrigation for the surrounding area. The dam is state-regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular state inspection and enforcement to ensure its safety and compliance with regulations.
Despite its low hazard potential and moderate risk assessment rating of 3, the condition assessment of Norman #4 (Fergus) is currently listed as "Not Rated." This suggests that the dam's overall condition and maintenance status are unclear, potentially warranting further evaluation and monitoring. While its emergency action plan (EAP) status is unknown, the dam's spillway type is uncontrolled, with a width of 100 feet. With a maximum discharge capacity of 137 cubic feet per second, Norman #4 (Fergus) plays a crucial role in managing water resources for irrigation purposes in the region.
As an important water resource structure in Montana, Norman #4 (Fergus) presents an intriguing case study for water resource and climate enthusiasts. Its association with Plum Creek, its history of construction and ownership, and its current regulatory oversight by the DNRC highlight the complex interplay between human infrastructure and natural water systems. The dam's location in a remote area with no designated town also adds to its unique charm, making it a focal point for understanding the intersection of water management, agriculture, and environmental stewardship in the region.
Year Completed |
1945 |
Dam Length |
1060 |
Dam Height |
20.6 |
River Or Stream |
PLUM CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
20.6 |
Drainage Area |
10 |
Nid Storage |
101 |
Hazard Potential |
Low |
Nid Height |
21 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Judith River Nr Mouth
|
368cfs |
Missouri River Near Landusky Mt
|
9100cfs |
Missouri River At Virgelle Mt
|
4820cfs |
Teton River At Loma Mt
|
30cfs |
Missouri River At Fort Benton Mt
|
4720cfs |
Marias River Near Loma Mt
|
335cfs |
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.
Norman #4 (Fergus)