Thanks for the update. To be frank, I thought that this triumph of Irish visionary thinking that was foisted on the good citizens of Chicago was disappearing!!
I had looked at it using google earth and it appeared that it had shrunk ( somebody filling it in surreptitiously hoping that it would be forgotten about?).
Check out 41 53’ 23.55" N
87 36’ 53.58" W
The hole appears to be very small. It may be that google earth needs updating. Can anybody (Pinster in NASA, NSA?) send the satellite over Chicago to update the pictures please? ( A geostationary orbit over the hole would be even better)