Webb #1 Reservoir Report
Nearby: Spun Dry Fork Fairhaven #1
Last Updated: December 5, 2025
Webb #1, also known as Elizabeth Reservoir, is a private dam located in Cascade County, Montana, near the city of ULM.
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Summary
The dam was completed in 1962 and serves the primary purpose of flood risk reduction along the Little Muddy Creek. It is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is subject to state permitting, inspection, and enforcement to ensure its safety and compliance with regulations.
This earth dam stands at a height of 15 feet and has a length of 375 feet, with a storage capacity of 50 acre-feet. Despite its low hazard potential, the dam's condition assessment is currently listed as "Not Rated," indicating a lack of recent evaluation. There is no Emergency Action Plan (EAP) prepared for the dam, and other risk management measures and assessments are also not available. It is important for water resource and climate enthusiasts to keep an eye on the maintenance and safety of Webb #1 to prevent any potential risks or hazards associated with its operation.
Overall, Webb #1 is a crucial infrastructure for flood risk reduction in the area, but its lack of recent assessments and emergency preparedness raise concerns about its safety and management. It is essential for relevant authorities and stakeholders to prioritize the evaluation and maintenance of the dam to ensure its continued functionality and safety for the surrounding community and environment. Water resource and climate enthusiasts should advocate for the proper monitoring and upkeep of dams like Webb #1 to prevent any potential disasters and protect valuable water resources.
Year Completed |
1962 |
Dam Length |
375 |
Dam Height |
15 |
River Or Stream |
LITTLE MUDDY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
50 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Cascade Mt
|
3090cfs |
Sun River Near Vaughn Mt
|
2680cfs |
Sun River At Simms Mt
|
1620cfs |
Muddy Creek At Vaughn Mt
|
86cfs |
Missouri River Near Ulm Mt
|
3160cfs |
Smith River Near Eden Mt
|
119cfs |
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.
Webb #1