Twelvemile Creek IA 05-GRA-6572

August 2021- This segment’s extent was adjusted to include only that portion from the sedimentation pond to headwaters. Previously the segment continued downstream past the dam of Twelve Mile Lake, and covered the same waterbody as Segment ID 1367.

Due to changes in Iowa’s surface water classification approved by U.S. EPA in 2008, this segment has presumptive Class A1 primary contact recreation and Class BWW1 warmwater aquatic life designated uses. According to Iowa Water Quality Standards, all perennial streams and intermittent streams with perennial pools that are not specifically listed in the Iowa surface water classification are designated as Class A1 and Class BWW1 waters.