Twitchell #1 Reservoir Report
Nearby: Green Coulee Dam Claribell #11 Dam
Last Updated: December 5, 2025
Twitchell #1 is a private irrigation dam located in Garfield, Montana, along the TR-FT PECK RESERVOIR.
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Summary
Built in 1960, this earth dam stands at a height of 24 feet and has a storage capacity of 63 acre-feet for irrigation purposes. Managed by the Montana Department of Natural Resources and Conservation (DNRC), the dam is regulated, inspected, and enforced by the state to ensure its safety and compliance with regulations.
With a low hazard potential and a current condition assessment of "Not Rated," Twitchell #1 provides essential water resources for agricultural activities in the region. Despite not having a designated emergency action plan (EAP) or updated inundation maps, the dam's operational integrity and low risk profile make it a vital structure for supporting water distribution and management in the area. As a key component of the irrigation infrastructure, Twitchell #1 plays a crucial role in sustaining agricultural livelihoods and water availability in the region.
For water resource and climate enthusiasts, Twitchell #1 offers a fascinating glimpse into the intersection of human infrastructure and natural water systems. Its location within the TR-FT PECK RESERVOIR watershed underscores the interconnectedness of water resources management, while its history and design provide valuable insights into the challenges and opportunities of irrigation infrastructure in rural Montana. As a privately owned and state-regulated structure, Twitchell #1 exemplifies the collaborative efforts required to effectively manage water resources and mitigate potential risks in a changing climate landscape.
Year Completed |
1960 |
Dam Length |
150 |
Dam Height |
24 |
River Or Stream |
TR-FT PECK RESERVOIR |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
63 |
Hazard Potential |
Low |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Milk River At Nashua Mt
|
233cfs |
Redwater River At Circle Mt
|
4cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Milk River At Tampico Mt
|
123cfs |
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.
Twitchell #1