Roundup Sewage Lagoon is an earth dam located in Musselshell County, Montana, built in 1957. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 1,000 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Roundup Sewage Lagoon
Roundup Sewage Lagoon is a dam in Musselshell, Montana. The dam is owned by City of Roundup (local government). It impounds the Tr-musselshell River near Roundup.
The dam stands 12 feet tall and stretches 1,000 feet across, and has a maximum storage capacity of 330 acre-feet. Completed in 1957, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 | Musselshell |
| Nearest City | Roundup |
| River/Stream | Tr-musselshell River |
| Coordinates | 46.44980, -108.52410 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 330 acre-ft |
| Max Storage | 330 acre-ft |
| Normal Storage | 312 acre-ft |
Ownership & Safety
| Purpose | Other |
| Owner | City of Roundup |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01411 |
| Federal ID | MT01411 |
| More Info | State Dam Safety Program |