Here is a note from Mark Heller the Logan Square parks advocate that got the ball rolling o this bad boy.

The Logan Square SKATEPARK site is UNDER I-90/94 Kennedy Expressway overpass
at 2400-2500 W Logan Blvd. Stop by and check it out. Huge unused space
under north side of overpass will become next great Chicago Park District Skatepark and only outdoor skate space "with a roof" = Interstate Kennedy XWay overpass. Additional highway right of way land on each side of expressway is also available for greenspace linear trails along sides of expressway.Some greenspace by overpass can be integrated with Skatepark. It's a blank canvas waiting for fantastic activity park to be created that embraces art / design too. It should be open and skateable 24/7.
To see and walk Skatepark space- it's Logan Blvd (2600N) just west of Western Ave (2400W). Access underpass space via existing hole in chain link fence at northwest corner of overpass structure at top of concrete ramp slope. It's pretty obvious. Some homeless live there but keep to themselves. Flat space on north side of Logan Blvd under overpass is more than 1/3 football field!, plus upsloping concrete ramp and overpass support piers. Imagine lots more lighting and legacy Skatepark you can help design.
This space is APPROVED for a Chicago Park District Skatepark! Get the word out.
Mark
Logan Square parks advocate

mobilizing 50-100 Skatepark community users and leaders out to Kennedy overpass for SCHEDULED media event (daylight hours) will help start citywide print/TV media awareness Logan Square Skatepark under Kennedy Expressway deserves.
I'd prefer first media/press event be truely community / skater grassroots; plus Erma Tranter (Friends of the PArks) and maybe Tim Mitchell representing PArk District. Concept advocacy for this was community grassroots and long predates local Alderman Rey Colon. This is part of strategy I emailed you and Alan Butella on weekend.

Photo overviews of location :

overview 1

overview 2