Summary
Built in 1969 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock water supply, and as a small fish pond. With a height of 20 feet and a storage capacity of 237 acre-feet, it plays a crucial role in water resource management in the area.
This dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections to ensure its structural integrity and compliance with state regulations. Despite its low hazard potential, the condition of Lyle Nelson #8 is not currently rated. The dam's spillway, with a width of 200 feet, helps manage high discharge events and prevent flooding downstream.
Located in a remote area with no nearby city, Lyle Nelson #8 is a key infrastructure for maintaining water resources and protecting against wildfires in the region. With its historical significance and ongoing role in water management, this dam serves as a testament to the importance of sustainable water resource development and climate resilience efforts in Montana.
Year Completed |
1969 |
Dam Length |
240 |
Dam Height |
20 |
River Or Stream |
TR-NORTH FORK ROCK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
0.31 |
Nid Storage |
237 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Milk River At Nashua Mt
|
233cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Redwater River At Circle Mt
|
4cfs |
Milk River At Tampico Mt
|
123cfs |
Poplar River Near Poplar Mt
|
28cfs |
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.
Lyle Nelson #8