The Ste. Gen-Modoc Ferry is accessible by taking Little Rock Road in Ste. Genevieve, north, to the levee. While in Illinois, you can access the ferry by taking Levee Road to the ferry landing.
The physical address, on the Missouri side, is 8205 Little Rock Road, Ste. Genevieve, MO, 63670. The physical address for the Illinois landing is 3482 Levee Road, Modoc, IL 62261.