kdgrills,
I rode on the newly paved section of the Centennial Trail that has the old bridge that used to be the 135th St. one many years back about a month back. (Coming north from Lockport, once you get to the 135th St. bridge about 3 miles north of Lockport, turn right onto the old 135th St., then make the u-turn onto the bridge and cross the canal and ship canal, then make a right and you're in.) Think it's done all the way to Willow Springs. You'll be in Cook Co. as soon as you go underneath the big I-355 bridge then shortly after going under Lemont Rd., you'll share the road w/ the dump trucks for a mile or so then be back on the trail. I only went as far as about 1/4 mile past Lemont Rd. bridge.
Brian