Todd #1 Reservoir Report
Nearby: Balsam #1 Robinson #8
Last Updated: December 6, 2025
Located in Custer County, Montana, Todd #1 is a privately-owned Earth dam built in 1936 for irrigation purposes on the West Forty Creek.
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Summary
With a height of 19 feet and a length of 400 feet, this dam has a storage capacity of 158 acre-feet, serving the local community with water for agricultural needs. Despite being classified as having low hazard potential and being in a not-rated condition assessment, Todd #1 is regulated by the Montana Department of Natural Resources and Conservation (DNRC), ensuring that it meets state permitting, inspection, and enforcement requirements.
Situated in the Congressional District 00 of Montana, Todd #1 is under the jurisdiction of the state and is subject to regular inspections to ensure its safety and compliance with regulations. With its location in the city of Mizpah and being owned and operated by a private entity, this dam plays a crucial role in water resource management and irrigation in the region. While it currently does not have an Emergency Action Plan (EAP) or updated risk assessment measures, Todd #1 continues to provide essential water resources for the surrounding area, contributing to the sustainable use of water in the face of climate challenges.
Year Completed |
1936 |
Dam Length |
400 |
Dam Height |
19 |
River Or Stream |
WEST FORTY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Nid Storage |
158 |
Hazard Potential |
Low |
Nid Height |
19 |
Seasonal Comparison
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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.
Todd #1