Townsend Sewage Lagoon is an earth dam located in Broadwater County, Montana, built in 1962. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 2,500 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 Townsend Sewage Lagoon
The primary purpose of Townsend Sewage Lagoon 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 City of Townsend (local government). It impounds the Tr-missouri River near Townsend.
The dam stands 9 feet tall and stretches 2,500 feet across, and has a maximum storage capacity of 148 acre-feet. Completed in 1962, 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.
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Location
| State | Montana |
| County | Broadwater |
| Nearest City | Townsend |
| River/Stream | Tr-missouri River |
| Coordinates | 46.32930, -111.53210 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 2,500 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 148 acre-ft |
| Max Storage | 148 acre-ft |
| Normal Storage | 120 acre-ft |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Townsend |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01418 |
| Federal ID | MT01418 |
| More Info | State Dam Safety Program |