McHENRY COUNTY, Ill. – “Pull off in about a mile and a half,” I tell my colleague Josh Sherwood, an ichthyologist with the Illinois Natural History Survey. A minute goes by before he flips on the amber light bar over our heads and pulls the truck into the grass alongside the Jane Addams Memorial Tollway, about 60 miles west of Chicago. The ground is littered with trash, broken glass and bits of tire – like any major highway. A few feet away is a small, unnamed stream, barely more than 2 feet wide and less than 6 inches deep.
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