Geology
The highest point along the Going to the Sun Road is Logan Pass, which is located right on the Continental Divide. The altitude of the pass is 6645 feet (2025 meters).
For more information about the Going to the Sun Road, check out this article : http://www.ohranger.com/glacier/going-sun-road
If you'd like to drive over Logan Pass, keep in mind that it is only open during the summer months, typically mid-June to mid-October. The rest of the year it's covered in lots and lots of snow.
I hope you have an exciting time exploring Illinois' caves. Be sure to check back in at OhRanger.com after you trip to share you park experiences with us!