We drove to St Charles and parked at Frontier Park. We’ve ridden the Katy Trail before, me twice, Billie four times. We always started in Clinton and finished in St Charles. 4 miles down the Katy Trail led to the turnoff for the Creve Coeur Trail.
1.5 miles to the beginning of the Creve Coeur Trail but that was on the other side of the Missouri River.
The Creve Coeur Trail headed toward a large man-made lake with a 3.7 miles paved trail around it.
There was a sign at the entrance to one short tunnel to be respectful (i.e. quiet) of the cliff swallows who had built nests inside.
Two trails in one day = 20 very good miles!