UPDATED DESCRIPTION 1/09/2020: This is a non-conventional evil cache type that anyone can now find but will still need stealth skills. Sitting down and feeling is the only way to find it.
Though the maps indicate this cache is in the middle of Woodall Rogers Freeway it's not. This is a park that was built on top of the Woodall Roger Bypass Freeway and has lots of activies to do. I have provided the URL within this description so you can see what's happening while you are searching.
About the Park in the Heart of the City, Klyde Warren Park serves as a central gathering space for Dallas and its visitors. The 5.2-acre deck park, designed by The Office of James Burnett, is an urban green space built over the recessed Woodall Rodgers Freeway between Pearl and St. Paul streets in downtown Dallas. Klyde Warren Park will be a highly active space, providing daily free programming for the public ranging from yoga to book signings to outdoor concerts and films. The park will be privately operated and managed by the Woodall Rodgers Park Foundation.