The Moonspinner Reservoir Report
Nearby: Ed Mcintyre Wanken
Last Updated: December 7, 2025
The Moonspinner, located in Toole, Montana, is a privately owned Earth dam completed in 1960 for purposes including fire protection, stock, or a small fish pond.
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Summary
With a height of 25 feet and a storage capacity of 35 acre-feet, this dam on the TR-MARIAS RIVER serves as a crucial resource for water management in the region. Managed by the DNRC and regulated by the state, The Moonspinner plays a vital role in ensuring water availability for various needs.
Despite its low hazard potential, The Moonspinner has not been rated for its condition assessment. However, with inspection, permitting, and enforcement conducted by the state, this dam is maintained to meet safety standards. While specific details about spillways, locks, and drainage areas are not provided, the dam's primary purpose and historical significance highlight its importance in providing water resources for the community in LOMA and beyond.
As a significant water resource in Montana, The Moonspinner continues to serve its intended purposes while also contributing to the local ecosystem. With its location in a Congressional District represented by Greg Gianforte (R), this dam stands as a testament to the importance of water management in mitigating the impacts of climate change and ensuring sustainable water resources for future generations.
Year Completed |
1960 |
Dam Length |
125 |
Dam Height |
25 |
River Or Stream |
TR-MARIAS RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
35 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
The Moonspinner