Here's another of Columbia's many drive-in theaters that I never went to, or at least I think it is. I don't really have an address from the 15 April 1973 ad in The State, just "at the Fairgrounds gate", and this lot, adjacent to Jaco's, is the only one that looks plausible. It is now, and has been for as long as I can remember, used for parking during the State Fair, and is vacant the rest of the year.
Of the three movies playing, I have never heard of two of them, and would never have heard of Blindman except for a recent retrospective review in Video Watchdog. This is a great magazine if you have any interest in SF/Fantasy/Horror/Low Budget movies. They were quite pleased with Ringo Starr's performance in this forgotten spaghetti western.
I'm not sure when the Skyway closed -- after 15 April 1973, obviously. I'm sure it was gone by the time I was in college around 1980 as I remember taking a bus to the Fair then, and I'm sure I would have noticed a drive-in as they dropped us off at the front gate.