Sidney Sewage Lagoon is an earth dam located in Richland County, Montana, built in 1960. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 4,000 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 Sidney Sewage Lagoon
Sidney Sewage Lagoon is a dam in Richland, Montana. The dam is owned by City of Sidney (local government). It impounds the Tr-yellowstone River near Sidney.
The dam stands 9 feet tall and stretches 4,000 feet across, and has a maximum storage capacity of 340 acre-feet. Completed in 1960, 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 | Richland |
| Nearest City | Sidney |
| River/Stream | Tr-yellowstone River |
| Coordinates | 47.69800, -104.11420 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 4,000 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 320 acre-ft |
Ownership & Safety
| Purpose | Other |
| Owner | City of Sidney |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01413 |
| Federal ID | MT01413 |
| More Info | State Dam Safety Program |