-Lower water (typical, but depends on rain. In low water we scraped a bunch)
-Fairly suburban: You are surrounded by homes and roads a good chunk of the time
-Scenic: lots of trees at parts, and you pass through a couple of parks.
There is one dam. Sudo-dam, really. It's a series of 3 tunnels that allow water to pass through. They can be opened and shut, but I've only seen them open. In low flow, you can actually pass through and not portage. Definitely don't do it in high water.
Downtown naperville is fun. There are minor rapids, but nothing that can't be handled.
On the other trip, we kept going to Hammel woods. I've covered that section before, as it starts with the merge of the eastern and western branches. Nothing was quite out of the ordinary this time. Flow is good, no major obstacles, and plenty of views!