Summary
Built in 1968 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 32 feet and a length of 240 feet, Lost Leg has a storage capacity of 47 acre-feet and a maximum discharge of 200 cubic feet per second.
The dam is classified as having a low hazard potential and a moderate risk level. While it is regulated and permitted by the state of Montana, its condition has not been formally assessed. The spillway is uncontrolled with a width of 18 feet, and the dam has not been modified since its completion. Despite its age, Lost Leg remains a key structure for water resource management in the area, and its importance in fire protection and agricultural activities cannot be understated.
Lost Leg stands as a testament to the enduring legacy of water resource infrastructure in Montana. As a critical component of the local ecosystem, this dam provides essential services to the community while also posing a manageable level of risk. Its construction and maintenance reflect the collaborative efforts of federal and state agencies, highlighting the importance of effective water management practices in the face of changing climate conditions. For water resource and climate enthusiasts, Lost Leg serves as a reminder of the delicate balance between human needs and environmental stewardship in sustaining our precious water resources.
Year Completed |
1968 |
Dam Length |
240 |
Dam Height |
32 |
River Or Stream |
TR-TONGUE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
32 |
Drainage Area |
0.94 |
Nid Storage |
47 |
Hazard Potential |
Low |
Nid Height |
32 |
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.
Lost Leg