Twin Bridges WWTP - Secondary Treatment Plant in Twin Bridges, Montana

Twin Bridges WWTP is a municipal wastewater treatment facility located in Twin Bridges, Madison County, Montana. The plant serves a small population of 407 residents, reflecting the rural character of the area. It is situated along Montana Highway 41 and treats wastewater from the local community. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal facilities. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 264.98 million gallons per year and currently discharges 321.76 million gallons annually, indicating operation near or at capacity. The treated effluent is discharged into a local water body that ultimately drains into the Jefferson River, a tributary of the Missouri River. The Missouri River flows into the Mississippi River and eventually reaches the Gulf of Mexico. The plant's discharge contributes to the water quality of these downstream waters, supporting aquatic life and recreational uses.

The plant discharges into a local watercourse that feeds the Jefferson River, which joins the Missouri River near Three Forks, Montana. The Missouri River is a major tributary of the Mississippi River, draining into the Gulf of Mexico. The watershed supports diverse aquatic ecosystems, including native fish species such as trout and sturgeon. The plant's secondary treatment helps protect water quality in this important river system.