Cog Hill # 4 - or Dudsdread is located just SW of Chicago along highway 171 in Lemont. There are 4-18 hole courses here, #2 & #4 are the best tracts for championship level golf.
Dubsdread was once the championship course for the PGA's Western Open for a number of years. It was originally designed by Dick Wilson and Joe Lee as a traditional parkland style course, but redesigned by the "Open Doctor" Rees Jones in 2008. There's six sets of tees overall from 5,441 yards to 7,554 yards, the white tees play to 6,382 yards, 71.9/134, course/slope ratings. It's a shot-maker's layout with tight landing areas, heavily bunkered both along the fairways and greenside with the greens large and undulating.
The #2 Ravines was originally designed by David McIntosh & Bert Coghill in 1929 with later redesign work by Joe Lee & Rocky Roquemore. It's name is appropriate as over half the holes cross ravines along tree lined fairways over rolling hills with numerous water hazards, sand bunkers, and smallish, fast and undulating greens. There's four sets of tees overall, the tips play to 6,837 yards, 72.7/126, course/slope.
The other courses, #1, a David McIntosh original design from 1927, with a 1963 Dick Wilson redesign, and #3, a Dick Wilson design are both routed over similar land, parkland style in design, and more of a value than #'s 2 or 4.