Before and after photos of Fourmile Creek near Ankeny, Iowa
Before and after photos of Fourmile Creek near Ankeny, Iowa, showing a wastewater outfall from a wastewater treatment facility (WWTF). The top photo is the creek before the WWTFwas closed, and the bottom photo is after the WWTF was shutdown. After the shutdown flow in the creek decreased significantly. Photo credits: Laura E. Hubbard, USGS, Layout by David W. Morganwalp, USGS.