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IDOT complies with Section 404 of the Clean Water Act (CWA) and the Illinois Interagency Wetland Policy Act of 1989 (IWPA). Departmental procedures for ensuring compliance with the CWA and IWPA are detailed in the IDOT Wetlands Action Plan, Bureau of Design and Environment Manual, Chapter 26-8. Under the CWA and IWPA, IDOT must demonstrate that all measures were taken to first avoid and then minimize impacts to wetlands to the fullest extent practicable. Unavoidable impacts are mitigated by way of wetland compensation through either restoration or creation of wetlands.

IDOT. The INHS and Illinois State Geological Survey provide technical assistance to IDOT in locating, evaluating and monitoring compensatory wetlands. More information on the Wetlands Group can be found on INHS’s Wetland Science Program webpage.