Rock Creek Lake
Rock Creek Lake is an earth dam located in Powell County, Montana, built in 1960. It carries a Significant hazard potential classification.
About Rock Creek Lake
The primary purpose of Rock Creek Lake is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Franklin Inc (private). It impounds the Rock Creek near Garrison.
The dam stands 30 feet tall and stretches 320 feet across, and has a maximum storage capacity of 2,552 acre-feet. Completed in 1960, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Powell |
| Nearest City | Garrison |
| River/Stream | Rock Creek |
| Coordinates | 46.42760, -112.94050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 320 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 2,552 acre-ft |
| Max Storage | 2,552 acre-ft |
| Normal Storage | 1,477 acre-ft |
Ownership & Safety
| Purpose | Water Supply |
| Owner | FRANKLIN INC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03747 |
| Federal ID | MT03747 |
| More Info | State Dam Safety Program |