This article relies largely or entirely on a single source. (December 2014)
|Tunnel Hill State Trail|
|Location||Johnson, Pulaski, Saline, and Williamson Counties, Illinois, United States|
|Nearest city||Vienna, Illinois|
|Area||45 miles (72 km)|
|Governing body||Illinois Department of Natural Resources|
The Tunnel Hill State Trail is a bicycle trail running from Eldorado to Karnak, Illinois. The trail runs along the former bed of a part of the Cairo and Vincennes Railroad, a transportation unit led during its early years by Civil War General Ambrose Burnside. The Cairo & Vincennes became a branch line of the Southern Railway before its trail section shut down in the late 1900s.
The trail connects to several trails including the River to River Trail; the Illinois southern route of the American Discovery Trail; the U.S. Bicycle Route 76 (part of the TransAmerica Bike Route); and the Trail of Tears National Historic Trail. 
The trail is 45 miles (72 km) long. The trail is suitable for both hiking and bicycling. The trail surface is crushed limestone. During the summer, the surface is hard packed and easily ridden on a road bicycle. However, at other times of the year, the trail may be soft and is better navigated on a mountain bike or hybrid.
Parking is available at several locations. However, full services (restaurants, lodging, groceries) are only available in Harrisburg and Vienna. There are limited services elsewhere along the trail.
- "Tunnel Hill State Trail". Illinois Department of Natural Resources. Retrieved 2018-07-19.
- American Trails-National Recreation Trails
- Map from the League of Illinois Bicyclists website - pdf
- Rails-to-Trails Conservancy
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