My fiancé and I visited this awesome free treasure in Illinois, Starved Rock State Park. I noticed this T7316E behind the information desk, so it would appear that Illinois State Parks use some type of Nortel Norstar or BCM system throughout the park system. The State of Illinois has long been a Nortel user from Centrex P Phones at Driver Services Facilities to BCM systems at smaller facilities.
The adjacent gift shop used Mitel phones which I assume are connected to a hotel lodge that is on the same grounds as the State Park.
I also attached some beautiful views of the park itself.