Rp Griffith #1 Reservoir Report
Nearby: Sheepland Easy Retention Dam
Last Updated: December 5, 2025
Rp Griffith #1 is a private irrigation dam located in Musselshell, Montana, along the TR-North Willow Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1963 by the USDA NRCS, this earth dam stands at 19 feet in height and stretches 800 feet in length, providing a storage capacity of 67 acre-feet for agricultural purposes. With a low hazard potential and a condition assessment of "Not Rated," this dam plays a crucial role in water resource management in the region.
Managed by the DNRC and regulated by the state of Montana, Rp Griffith #1 is subject to regular inspections, permitting, and enforcement to ensure its safety and compliance with state regulations. The dam has a spillway width of 200 feet and a maximum discharge capacity of 2300 cubic feet per second, making it an important infrastructure for managing water flow and irrigation in the area. Despite its age, the dam continues to serve its primary purpose effectively while meeting state jurisdiction requirements.
Located in the Congressional District 00 of Montana and owned by a private entity, Rp Griffith #1 remains a vital piece of infrastructure in the region's water resource management system. With its historical significance dating back to the 1960s, this dam showcases the ongoing efforts to balance the needs of agriculture with environmental conservation and sustainable water use practices in the face of changing climate conditions.
Year Completed |
1963 |
Dam Length |
800 |
Dam Height |
19 |
River Or Stream |
TR-NORTH WILLOW CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Drainage Area |
14.06 |
Nid Storage |
67 |
Hazard Potential |
Low |
Nid Height |
19 |
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.
Rp Griffith #1