Katy Trail State Park

Historical marker location:

6557 Katy Trail, Machens, Missouri

( Marker is on Machens Road, 0.4 miles south of State Highway 94, on the left when traveling south.)

Eastern Terminus.

The Missouri State Penitentiary, located in Jefferson City, was once the oldest operating prison west of the Mississippi River. It opened in 1836 and closed in 2004.