The East Branch DuPage River watershed encompasses 81 square miles of central DuPage and northern Will Counties. The major tributaries are St. Joseph and Prentiss Creeks. The main stem of the East Branch is approximately 26 linear miles. The East Branch joins the West Branch of the DuPage River on the Bolingbrook municipal line to form the main stem of the DuPage River. The DuPage is a tributary to the Des Plains River. Sixteen municipalities are located within the watershed. A total of 11 publicly owned treatment plants discharge to the East Branch as does one combined sewer overflow.

The land uses found in the East Branch watershed are mostly residential and urban and are given in the land use summary table.  Measured at the USGS station at Bolingbrook (station 05540250) , annual mean flow for the river is 109 cfs (calculated from data for water years 1989-2004).

• TMDL Report East Branch DuPage River 2004
• View Watershed Map