Last Chance Ponds Lodge STP - Island Park, Idaho Wastewater Treatment Plant

Last Chance Ponds Lodge STP is a wastewater treatment facility located in Island Park, Idaho, along the Idaho Medal of Honor Highway. The plant serves a small population of around 1,299 residents and operates as part of the local municipal infrastructure in Fremont County. The plant provides secondary treatment, which is the standard biological treatment process required by the U.S. Clean Water Act for most municipal facilities. Its designed capacity is 227.12 megaliters, and it currently treats 151.42 megaliters per year, indicating operational headroom. As a U.S. facility, it operates under an EPA NPDES permit issued by the Idaho Department of Environmental Quality, which sets effluent limits to protect water quality. The treated effluent is discharged into the local watershed, which ultimately drains into the Henrys Fork of the Snake River. This river system supports diverse aquatic life and is part of the larger Columbia River Basin, flowing to the Pacific Ocean. The plant's location in a mountainous, rural area underscores its role in protecting downstream water quality.

The plant discharges into the Henrys Fork of the Snake River, a major tributary of the Snake River, which flows into the Columbia River and eventually the Pacific Ocean. This watershed supports important fisheries, including trout and salmon, and provides habitat for migratory birds. The area's cold-water ecosystem is sensitive to nutrient loading, making effective treatment essential.