I started at the southern end in River Forest. The trail was a flooded mudpit despite the fact that it hasn't rained in ages, was covered in huge fallen tree branches, and just in overall disrepair. Then, just past Fullerton, the trail literally disappeared INTO the Des Plaines River, leaving you NO choice but to turn back around. You're literally no better off on this trail than you would be if you just started off randomly making your way through the forest.

I mostly ride the crushed Gravel from the Genoa City Parking area down to Petersen Park. The trail is well maintained, although some of the asphalt is in need of some TLC. All-in-All, it's a 5 star trail as is most of the trails in Illinois. The parking areas are well maintained and convenient with Bathroom facilities and water.

I have been riding this trail for 10 years now and it is awesome. I ride a MTB and a drop bar gravel bike and both are well suited for any conditions on this trail. I personally love to ride thru mud and water...it's just plain fun as is this trail.

This paved trail is a short (3 mile) north-south connector between two more prominent east-west rail trails -- the Lake Country Trail and the Glacial Drumlin State Trail. The route in its entirety parallels Cushing Park Road, running for more than a mile along the western edge of Lapham Peak State Park and Evans Prairie, where views of prairie grasses and wildflowers can be enjoyed by passing bikers and hikers. Elevation changes over the gently rolling terrain are easy to negotiate.

I returned on one of those great Midwestern fall days to complete the portion of the Glacial River Trail south of Jefferson. I found the few miles that were in-fact a former railroad. The rest of the trail is in the WI-26 freeway corridor or on rural roads and city streets, but the trail is all paved.
The city of Fort Atkinson is very attractive with trail amenities including public art. I again found that the TrailLink map was a necessity as the signage on the tail is sparse.
My only negative is there is no need to do the on-highway portion south of N Wright Rd unless you want to continue to the connection to the Spring Brook Trail that will take you into Janesville.
For an out and back trip consider places where you can use the parallel old WI-26 for a different landscape view.

Plenty of space to park stock trailer in gravel lot on Lake Shore Rd Clinton. Cute little covered bridge in small park with picnic tables was the start of my mule ride. There were trash receptacles, handicap accessible restroom & a wood post hitching rail. Many "sponsored" rest spots with wooden benches, picnic tables & some had roofs along the flat trail. Trail bed is wide, flat & firm as small crushed gravel & grass base. Views of plant/tree farm & rural properties after brief bit of SE side of Clinton. Mileage markers. Several blacktop road crossings. Easy, well-groomed trail. Small gravel lot at east end with trail map on kiosk. For lunch at Boar's Nest Bar ride Hill St (right uphill), stay right on Clinton St, quick Left along west side of the Park 1 block to stop sign Cty X. Ride directly across Cty X then straight across grass to cable picket line.
I-43 runs parallel to trail. Loud traffic but distance kept equines from becoming unnerved 🙂 Met a jogger, a hiker with a leashed dog on trail & 2 bicyclists at covered bridge. All were respectful of equines.

I use the southern most part of Trail from Bloomindale Ave up to Ohare mostly. Trail is great, views, water at groves is close, only negative is all dead wood after flooding. I t can sit and block trails for months until its removed.

The Glacial River Trail in the Rock River valley is untypical for Wisconsin state trails in that it is entirely paved and not a rail-to-trail. It has a great mix of segments in the WI-26 freeway corridor, city streets and rural roads, with some good grades. I did the north part of the trail from Jefferson to the junction with the Wild Goose State Trail. There are no services provided by the trail owner, but the trail is free to use. The signage for the trail-turns is minimal so the Trail-Link map downloaded on your smart phone is a must. I especially enjoyed my ride thru the river towns of Jefferson, Johnson Creek and Watertown, where I took the time to ride around the downtowns. I will come back someday to do the south portion.

Parked at Cottage Grove today and biked out 23 miles and then back to car. It was annoying that we both paid our 5 dollars and then visited the rest room. No toilet paper in mens or women's and both stalls in women's were smeared with feces. Nice surface on trail. Not enough benches. This trail would definitely not qualify as a national rail trail.