Join Date: Jan 2006
Location: NE IL
Bikes: Surly Long Haul Trucker, Giant Cypress DX
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It's been a year since I was on that section, so hopefully someone with more recent experience will join in. I don't know your bike, but I would want about 700x32tires. There has been a lot of rain lately and there may be some soft, muddy spots between Seneca and Marseilles. It would certainly be rutted and very soft between Marseilles and Ottawa. Fortunately, if the tow path is too soft, you can jump off to ride one of the roads that parallel the canal.
Call the DNR at Gebhardt Woods to check current conditions.