Kelly Dam, located in Beaverhead, Montana, is a privately owned structure built in 1965 primarily for irrigation purposes on Rattlesnake Creek.
Wind
Humidity
Standing at 26 feet high with a length of 230 feet, the dam has a storage capacity of 850 acre-feet and covers a surface area of 44 acres. Despite being earth-filled, the dam has a high hazard potential and is regulated and inspected by the Montana Department of Natural Resources and Conservation.
The dam's spillway is uncontrolled, with a maximum discharge capacity of 1240 cubic feet per second. While the condition assessment is currently not rated, the dam undergoes inspections every five years, with the last one conducted in July 2018. In case of emergencies, an Emergency Action Plan (EAP) is in place, last revised in December 2018. With a moderate risk assessment rating of 3, the dam's risk management measures and inundation maps are yet to be prepared, highlighting the importance of continued monitoring and maintenance for water resource and climate enthusiasts in the area.
Year Completed |
1965 |
Dam Length |
230 |
Dam Height |
26 |
River Or Stream |
RATTLESNAKE CREEK |
Primary Dam Type |
Earth |
Surface Area |
44 |
Hydraulic Height |
26 |
Drainage Area |
24.6 |
Nid Storage |
850 |
Structural Height |
26 |
Hazard Potential |
High |
Nid Height |
26 |
Beaverhead River At Dillon Mt
|
141cfs |
Beaverhead River At Barretts Mt
|
114cfs |
Big Hole River Near Melrose Mt
|
464cfs |
Big Hole River Near Glen Mt
|
341cfs |
Beaverhead River Near Twin Bridges Mt
|
244cfs |
Big Hole River Near Jackson Mt
|
25cfs |