Not sure what this construction is for. I have never seen anything or anybody here and the area around the construction is overgrown with weeds. The structure does not seem to be an entrance to anything. There is a stone on the bottom center which indicates "ERECTED BY CCC-ID AUG.1940"
The Civilian Conservation Corps (CCC) was a voluntary public work relief program that operated from 1933 to 1942 in the United States for unemployed, unmarried men.