Map of Southwestern Alberta showing river sampling sites along the Oldman River (O1, O2, and O3), Willow Creek (W1), and Little Bow River (L1). Wastewater outflows for the Town of Fort MacLeod, City of Lethbridge, Town of Picture Butte, and Town of Coaldale are marked with asterisks from left to right. (Source: Alberta Environment and Sustainable Resource Development.)