US Army Corps of Engineers
Chicago District Website

McHenry County, Illinois Advanced Identification of Wetlands

  1. Public Notice of Advance Identification of Wetlands (ADID) Study Finalization
  2. Public Notice of Exertion of Discretionary Authority over McHenry County ADID Wetlands
  3. ADID Study, Final Report, December 1998
  4. McHenry County Weblink

As part of the ADID process, a geographical information system (GIS) was developed by the Chicago Metropolitan Agency for Planning (CMAP).

McHenry County ADID Maps by Township  

By clicking on the township names below, you will be able to view a .pdf file using Acrobat Reader. Each map has a legend that lists aquatic resources by a number. The following resource categories were included in the ADID designation: High quality streams, High quality lakes, High quality habitat wetlands, and High functional value wetlands.


Alden Township

Algonquin Township

Burton Township

Chemung Township

Coral Township

Dorr Township

Dunham Township

Grafton Township

Greenwood Township

Hartland Township

Hebron Township

Marengo Township

McHenry Township

Nunda Township

Richmond Township

Riley Township

Seneca Township



For more information on the McHenry County ADID Maps you may contact:

McHenry County Planning and Development Department in Woodstock - Alicia Law (815) 334-4520

McHenry County Conservation District in Ringwood - Steve Gulgren (815) 678-4431

U.S. Environmental Protection Agency in Chicago - Sue Elston (312) 886-6115