Snake Road in Shawnee National is being shut down to vehicles to allow for the safe passage of endangered snakes.. ... Wildlife authorities in Illinois have shut down a two-mile stretch of road to vehicles through late October due to a yearly snake migration. The U.S. Forest Service said Forest Road #345 – also known as "Snake Road" – in the Shawnee National Forest was closed to vehicles starting September 1st and will remain closed through October 30th. It’s also closed every year for a short time in the Spring. ... The snakes migrate from LaRue Swamp to the nearby...