Harlowton Sewage Lagoon is an earth dam located in Wheatland County, Montana, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 4,565 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 Harlowton Sewage Lagoon
Harlowton Sewage Lagoon is a dam in Wheatland, Montana. The dam is owned by City of Harlowton (local government). It impounds the Musselshell River Offstream near Shawmut.
The dam stands 10 feet tall and stretches 4,565 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 190 acre-feet, and collects water from a drainage area of 21 square miles. Completed in 1958, 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. The most recent inspection on record was 05/10/1979. That was over 47 years ago.
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Location
| State | Montana |
| County | Wheatland |
| Nearest City | Shawmut |
| River/Stream | Musselshell River Offstream |
| Coordinates | 46.42885, -109.80050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 4,565 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 190 acre-ft |
| Max Storage | 190 acre-ft |
| Normal Storage | 129 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 21 sq mi |
| Max Discharge | 6 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | City of Harlowton |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/10/1979 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01416 |
| Federal ID | MT01416 |
| More Info | State Dam Safety Program |