The Chicago Transit Authority (CTA) is making track improvements to prevent slow zones and to improve rail service on the Green Line. Work will be performed on the elevated tracks from Ogden Avenue (W) to Aberdeen Street (E) along Lake Street beginning Friday, June 21 at 7:00PM and ending Monday, June 24 at 4:00AM.Staging activities begin at 7:00AM on Friday, closing Ada and May to vehicular traffic; contractors begin mobilizing at 7:00PM on Friday, closing Lake Street to vehicular traffic between Ogden Avenue (W) and Aberdeen Street (E). Between 7:00-11:00PM Friday, the Morgan Station will remain open to CTA riders. During the weekend, eastbound trains from Harlem turn around at Ashland. There is a free bus shuttle from Ashland to Clinton. Westbound trains from the Loop stop at Clinton. There is a free bus shuttle from the Clinton to Ashland. The Lake Street Green Line tracks are the original “L” tracks ever laid. They were built in 1892, before Chicago had three of its four stars. As the West Loop continues to grow, infrastructure upgrades along this stretch of track are needed to ensure the safety and efficiency of public rail service. The Morgan Station already receives over 900,000 annual riders. We hope you understand the need for the temporary closure and the benefits it will help bring to the service.