L Galt #20 Reservoir Report
Nearby: Nnn Ranch #1 Nnn Ranch #2
Last Updated: December 6, 2025
L Galt #20, located in Rosebud County, Montana, is a privately owned earth dam completed in 1954 for fire protection, stock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
With a height of 18 feet and a length of 250 feet, this dam has a storage capacity of 240 acre-feet and a maximum discharge potential. Despite being regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC), the dam is currently rated as having a low hazard potential and its condition remains unrated.
Situated on TR-McGinnis Creek in Forsyth, Montana, L Galt #20 serves as an essential water resource for the surrounding area, contributing to the conservation of water for various uses. The dam's location in a congressional district represented by Greg Gianforte (R) further underscores its significance in the region's water management infrastructure. While the dam has not been subject to modifications or assessments in recent years, its operational status and emergency preparedness measures are yet to be fully documented.
For water resource and climate enthusiasts, L Galt #20 presents an intriguing case study of a privately owned dam in Montana that plays a crucial role in local water management and conservation efforts. The dam's historical significance, structural characteristics, and regulatory oversight by DNRC offer valuable insights into the complexities of maintaining and monitoring such critical infrastructure in the face of changing environmental conditions. As interest in sustainable water resource management grows, continued monitoring and assessment of dams like L Galt #20 will be essential to ensuring their long-term safety and effectiveness in serving the needs of the community.
Year Completed |
1954 |
Dam Length |
250 |
Dam Height |
18 |
River Or Stream |
TR-MCGINNIS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
240 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
L Galt #20