Mill Creek (aka Big Mill Creek) IA 01-TRK-115

This segment is identified as an Outstanding Iowa Water under the antidegradation policy in Iowa Water Quality Standards. Prior to the 2008 IR cycle, this segment only had the Class B(CW) coldwater aquatic life designated use. Due to changes in Iowa’s surface water classification approved by U.S. EPA in 2008, this segment now has presumptive Class A1 primary contact recreation and Class A2 secondary contact recreation designated uses. This segment also has Class B(CW1) coldwater aquatic life and Class HH (human health/fish consumption) designated uses.