Gallatin County Shawnee National Forest Rosiclare Ranger District
c.1942: "High Knob Lookout Tower and Recreation Area: 920 feet above sea level. Offers excellent view of the surrounding country from either the vista points on the bluffs or the U.S. Forest Service Lookout Tower. Parking area and parking facilities. This area borders the counties of Hardin and Gallatin about 1 1/2 miles north of Karber's Ridge." ("Illinois Ozark Region - Historic Development of County Names, etc....)
August 18, 1972: An advertisement was published in the 'Southern Illinoisan' for bids for the sale of this and seven other steel lookout towers on the Shawnee National Forest.