CCC workers might have done work around Riverside ,but I am not sure the actual camp was there.....this is some of what I have ......
In 1929, the State purchased 3000 acres as the Kohn-Jackson Forest, later named Union State Forest. During the 1930's the Civilian Conservation Corps (CCC) camp operated in the Forest. The CCC constructed many of the stonework stabilization walls and log stone shelters within the picnic area and along the Forest roads.
Camp Cadiz
From Elizabethtown, IL, take State Rt. 146 east 8.4 miles to
State Rt. 1. Turn left onto Rt. 1 and go 7 miles to campground
sign. Turn left and go 2.9 miles to campground.
The campground is the site of a former Civilian Conservation
Corps (CCC) camp. Old foundations and fireplace chimneys are all
that remain. Although there is a hitching rail for horses behind
site 11, the campground appears to be more popular with ATV
enthusiasts
1933—The New Deal Program's Civilian Conservation Corps was created, and 500,000 unemployed young men were hired to plant trees, develop parks and recreation areas, restore silted waterways, provide flood control, control soil erosion, protect wildlife and carry out other conservation projects. Construction labor for state park lodges and cabins was furnished by the CCC, and eventually more than 77 CCC camps operated in Illinois. A worker was paid $30 a month, of which $25 was sent to his family. Room board, clothing and tools were provided by the government. The CCC disbanded in July 1942.
1933—Aldo Leopold of the University of Wisconsin became America's first professor of game management and published a textbook, Game Management. Leopold's game management creed: '...game is a crop, which nature will grow and grow abundantly, provided only we furnish the seed and a suitable environment.'
1936—CCC workers had completed construction of most of the buildings at Pere Marquette, Giant City, White Pines, Starved Rock and Giant City state parks.