Mark from Lee's Summit on 8/20/2018 9:29:13 AM:
The Mississippi Riverfront Greenway Trail runs about 12 miles north from Downtown St. Louis if you are starting near the Arch. Your best be then is to enjoy the longer route across the Mississippi River and utilize the nice trails in Illinois in order to get to Machens. This Illinois route is about 28 miles versus 18 miles, but the shorter Missouri route would require you to ride on major highways with small shoulders. The Illinois route takes you across the Old Chain of Rocks pedestrian/bike bridge into Illinois where you jump on the Madison County Confluence Trail. Take that trail to the northwest past Wood River and into Alton where you can cross back into Missouri using the striped bike lane on the cable-stayed Clark Bridge Hwy. 67). Once you cross back into Missouri, take rough West Alton Trail to get close to St. Charles Street. Then take St. Charles Street to 94 Hwy. to Saale Road to Dwiggins Road to 94 Hwy. to Machens Road...the idea is to use county sidestreets to stay off of 94 Hwy. as much as possible. Machens Road takes you to the Katy trailhead just across the live railroad tracks.