Iverson Reservoir Report
Nearby: O'Haire Fender Bender
Last Updated: December 21, 2025
Iverson is a privately owned irrigation dam located on Willow Creek in Toole, Montana.
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Summary
Completed in 1934, this earth dam stands at 20 feet tall and has a storage capacity of 264 acre-feet. The primary purpose of the dam is for irrigation, with a normal storage of 33 acre-feet. It is regulated by the Montana Department of Natural Resources and Conservation (DNRC), with state permitting, inspection, and enforcement in place to ensure its safety and compliance.
Situated in Congressional District 00, Montana, Iverson plays a vital role in providing water for agricultural activities in the region. With a low hazard potential, the dam has not been rated for its condition assessment. Emergency action plans and risk management measures are not currently available for the dam, highlighting areas for improvement in ensuring the safety and resilience of this essential water resource infrastructure.
Despite its age, Iverson continues to serve its intended purpose effectively, contributing to the irrigation needs of the area. With its location in the Omaha District of the US Army Corps of Engineers, the dam stands as a testament to the importance of maintaining and monitoring water resource infrastructure to support both agricultural activities and the surrounding ecosystem in a changing climate.
Year Completed |
1934 |
Dam Length |
450 |
Dam Height |
20 |
River Or Stream |
WILLOW CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
264 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Iverson