Thats actually 3 different holes. One of the main sewers is being rerouted through our job (12' diameter)
Chicago has more movable bridges than any other city in the world, somewhere around 40. Twenty are in the down town area (three shown in my pictures Harrison, VanBuren, and the big double one under construction, Congress parkway. The one used in the Blues Brothers movie is 95th st over the Calumet river which is about 8 miles south of here.