Illinois Route 31 Logo

CSS Documents

Stakeholder Involvement Plan (SIP) | PDF | 10MB

Environmental Documents

Environmental Assessment | PDF | 5MB
Exhibit 1 - Location Map | PDF | 409KB
Exhibit 2 - Local Jurisdiction Map | PDF | 50KB
Exhibit 3 - Wetland Impact Exhibits | PDF | 4MB
Exhibit 4 - Environmental Resource Map | PDF | 32MB
Exhibit 5 - Best Mangement Practices | PDF | 17MB
Coordination | PDF | 76MB
Appendix A - Social and Economic Resources | PDF | 10MB
Appendix B - Farmland Impacts | PDF | 17MB
Appendix C - Traffic Noise Analysis | PDF | 45MB
Appendix D - Biological Surveys | PDF | 15MB
Appendix E - Stream Data | PDF | 205KB
Appendix F - Wetland Delineations | PDF | 65MB
Appendix G - NEPA 404 Merger Meeting Materials | PDF | 30MB
Appendix H - Stormwater Performance | PDF | 33MB
Appendix I - Purpose and Need Updates | PDF | 403KB
Appendix J - Traffic Level of Service Map | PDF | 4MB

IDOT District 1
201 West Center Court
Schaumburg, IL 60196

Prairie Grove Village Hall
3125 Barreville Road
Prairie Grove, IL 60012

McHenry Public Library
809 Front Street (IL Route 31)
McHenry, IL 60050

Comments received by March 10, 2017 will become part of the official record.

Technical Reports