I-75/475 Interchange Ramp Closures in Perrysburg – click on the maps for a pdf of each ramp closure and detour, there is also a link to sign up for more information on the right side. Closure: The ramps will close in Mid to late May for 120 days. Watch for updates on this soon! http://www.dot.state.oh.us/districts/D02/Pages/I-75-I-475-interchange-Perrysburg.aspx