Allenton Creek Allenton Creek is one of the headwater streams forming the East Branch of the Rock River. The East Branch of the Rock River is classified as WWSF for its entire 45 miles. Some of the nonpoint sources of water pollution are croplands, barnyards, streambank erosion from cattle operations, and urban runoff. Three millponds created by dams, two in Mayville and one in Kekoskee, exist in the lower portion of the river and are also preventing the river from meeting its full potential. The millponds impede fish migration and encourage rough fish breeding.
Upper reaches have good water quality and instream habitat but additional monitoring is needed.
The City of Mayville is the largest municipal discharger in the district, with a peak design flow of 1.1 million gallons per day. Most industrial dischargers in Mayville have noncontact cooling water discharges to the East Branch Rock River. Kummel Creek Kummel Creek begins just above the village of Brownsville and joins with the East Branch of the Rock River 16 miles downstream at Theresa Marsh. Sediment and silt deposition is severe in pool areas of the stream. Portions of the creek have been channelized.