Ivy Reservoir Report
Nearby: Willow (Musselshell) Little Wall
Last Updated: December 5, 2025
Located in Musselshell County, Montana, the Ivy dam stands as a vital water resource managed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1974, this earth dam boasts a height of 20 feet and a length of 1000 feet, providing a storage capacity of 444 acre-feet and serving the surrounding area with a normal storage of 153 acre-feet. Situated on TR-Little Wall Creek, the dam has a drainage area of 0.94 square miles and a maximum discharge of 1600 cubic feet per second.
Despite being labeled as low hazard potential, the condition of Ivy dam has not been formally assessed. However, with state regulation, inspection, and enforcement mechanisms in place, the dam is maintained by the DNRC to ensure its structural integrity and functionality in protecting the local community from potential risks. Although the dam has not been rated for its condition, the presence of a spillway width of 140 feet and the designation of it as a state-jurisdictional structure signify the importance and care taken in managing this essential water resource. For water resource and climate enthusiasts, Ivy dam stands as a testament to the collaborative efforts between private owners, state agencies, and federal designers in safeguarding water infrastructure for multiple beneficial uses.
Year Completed |
1974 |
Dam Length |
1000 |
Dam Height |
20 |
River Or Stream |
TR-LITTLE WALL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
0.94 |
Nid Storage |
444 |
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.
Ivy