Large truck parking is available just yards away from the Katy Trail and historic St. Charles, Missouri at the Ameristar Casino, but if you don’t know exactly where you’re going you could end up on a historic brick road and doing some serious damage.
Take exit 229 from I-70 to S 5th St, and head north. You’ll see the casino at this point. At the first light turn right onto Ameristar Blvd. Go over the hill one block to Main St. and turn right. Do not cross the bridge in your truck. Right away you’ll see the construction entrance on your left. Park in that lot. The Katy Trail runs along the lot, and St. Charles is just a couple hundred yards to the north.