761 Lang Reservoir Report
Nearby: Kirschten #1 Upper Baker Dam
Last Updated: December 6, 2025
Located in Fallon, Montana, 761 Lang is a privately owned earth dam that serves multiple purposes including fire protection, stock watering, and small fish pond.
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Summary
Built in 1965 by the Natural Resources Conservation Service, this dam on Waterhole Creek has a height of 21 feet and a storage capacity of 127 acre-feet. With a low hazard potential and a moderate risk assessment, this structure is regulated, permitted, inspected, and enforced by the Montana Department of Natural Resources and Conservation.
The dam has a spillway width of 50 feet and a maximum discharge capacity of 500 cubic feet per second. Despite being uncontrolled, the dam's condition is currently not rated, and it has not been assessed for emergency action plans or inundation maps. With its primary purpose being fire protection, the dam plays a crucial role in ensuring water availability for various uses in the area. As a vital resource for the local community, monitoring and maintenance are key to ensuring its continued functionality and safety for both humans and wildlife.
The proximity to Marmarth, N.D., and the Congressional District 00 in Montana makes 761 Lang an important asset in the region's water resource management. As climate change continues to impact water availability and usage, structures like this earth dam become even more significant in maintaining a stable and sustainable water supply. With proper management and oversight, this dam will continue to play a crucial role in mitigating water-related challenges in the area for years to come.
Year Completed |
1965 |
Dam Length |
200 |
Dam Height |
21 |
River Or Stream |
WATERHOLE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Drainage Area |
1.4 |
Nid Storage |
127 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
761 Lang