Looking upstream Mackinaw River at Green Valley, Illinois.

Personnel to contact about a specific subject are listed on the staff page.

U.S. Department of the Interior
U.S. Geological Survey
221 North Broadway, Urbana, IL 61801, USA
URL: http://il.water.usgs.gov/proj/lirb/aerial/gv3us.html
Maintainer: djfazio@usgs.gov
Last modified: 16:35 CST Mon 19 May 2000