BikerBoy from Maryville, IL on 10/5/2019 2:43:15 PM:
Every couple of years this question comes up. At one time, I calculated the cost to asphalt the entire Katy at around $20 million, or about $85,000 per mile. That might be feasible for the very popular Eastern portion, but would be wasted in a lot of other areas. But there are major problems with paving. Here is what I wrote two years ago:
The maintenance of an asphalted (or even oil-and-chip) trail the length of the Katy would be astronomical. Here in Illinois, on our wonderful paved trails, the tree roots are pushing up the asphalt in hundreds of places. They would not be noticed on a gravel trail because the gravel flows around them. But on these asphalt trails, they become teeth-chattering bumps and are dangerous. To repair these, the asphalt must be cut out with a saw and then patched, or at the very least, ground down. If you ride the Hennepin Canal Trail (105 miles), you will see the result of good intentions (paved surface) gone bad (no maintenance). It would have been much better to leave it in limestone gravel.