Lots of them! Plan ahead.

MILE DESCRIPTION ANTICIPATED CLOSURE ANTICIPATED OPENING
1 ColumbusDr.: Start to Grand Ave. 7:30 a.m. 9 a.m.
1 Grand Ave.: ColumbusDr. to Rush St. 7:30 a.m. 9 a.m.
2 Rush St.: Grand Ave. toHubbard St. 7:30 a.m. 9 a.m.
2 Hubbard St.: Rush St. to State St. 7:30 a.m. 9 a.m.
2 State St.:Hubbard St. to Jackson Blvd. 7:30 a.m. 9 a.m.
3 Jackson Blvd.: State St. to LaSalle St. 7:30 a.m. 9 a.m.
3/4/5 LaSalle St.: Jackson Blvd. to StocktonDr. 7:30 a.m. 9:30 a.m.
6 StocktonDr.: LaSalleDr. to FullertonDr. 7:30 a.m. 10:45 a.m.
6 FullertonDr.: StocktonDr. to CannonDr. 7:30 a.m. 10:45 a.m.
7 CannonDr.: FullertonDr. to SheridanRd. 7:30 a.m. 10:45 a.m.
7 SheridanRd.:Diversey Pkwy. to Belmont Ave. 7:30 a.m. 10:45 a.m.
8 Inner Lake ShoreDr.: Belmont Ave. to Addison St. 7:30 a.m. 10:45 a.m.
8 Addison St.: Inner Lake ShoreDr. to Broadway St. 7:30 a.m. 10:45 a.m.
9 Broadway St.: Addison St. toDiversey Pkwy. 7:30 a.m. 10:45 a.m.
10 Clark St.:Diversey Pkwy. toWebster Ave. 7:30 a.m. 11 a.m.
10 Webster Ave.: Clark St. to Sedgwick St. 7:30 a.m. 11 a.m.
10 Sedgwick St.:Webster Ave. toNorth Ave. 7:30 a.m. 12 p.m.
11 North Ave.: Sedgwick St. toWells St. 7:30 a.m. 12 p.m.
11/12 Wells St.:North Ave. toHubbard St. 7:30 a.m. 12 p.m.
12 Hubbard St.:Wells St. to Orleans St. 7:30 a.m. 12 p.m.
13 Orleans St.:Hubbard St. toWackerDr. 7:30 a.m. 12 p.m.
13 Franklin St.:WackerDr. to Adams St. 7:30 a.m. 12 p.m.
13/14/15 Adams St.: Franklin St. toDamen Ave. 7:30 a.m. 12:30 p.m.
15 Damen Ave.: Adams St. to Van Buren St. 7:30 a.m. 12:30 p.m.
16 Van Buren St.:Damen Ave. to Ogden Ave. 7:30 a.m. 12:30 p.m.
16 Ogden Ave.: Van Buren St. to Jackson Ave. 7:30 a.m. 12:30 p.m.
16/17 Jackson Ave.: Ogden Ave. toHalsted St. 7:30 a.m. 1 p.m.
17 Halsted St.: Jackson Blvd. to Taylor St. 7:30 a.m. 1 p.m.
18 Taylor St.:Halsted St. to Ashland Ave. 7:30 a.m. 1:30 p.m.
19 Ashland Ave.: Taylor St. to 18th St. 7:30 a.m. 1:30 p.m.
20 18th St.: Ashland Ave. toHalsted St. 7:30 a.m. 1:30 p.m.
21 Halsted St.: 18th St. to Archer Ave. 7:30 a.m. 2 p.m.
21/22 Archer Ave.:Halsted St. to Cermak Rd. 7:30 a.m. 2 p.m.
22 Cermak Rd.: Archer Ave. toWentworth Ave. 7:30 a.m. 2 p.m.
22/23 Wentworth Ave.: Cermak Rd. to 33rd St. 7:30 a.m. 2:30 p.m.
23 33rd St.:Wentworth Ave. to State St. 7:30 a.m. 2:30 p.m.
24 State St.: 33rd St. to 35th St. 7:30 a.m. 2:30 p.m.
24 35th St.: State St. toMichigan Ave. 7:30 a.m. 2:30 p.m.
24/ 25/26 Michigan Ave.: 35th St. to Roosevelt Rd. 7:30 a.m. 3 p.m.
26 Roosevelt Rd.:Michigan Ave. to ColumbusDr. 7:30 a.m. 3 p.m.
26 ColumbusDr.: Roosevelt Rd. to Finish 7:30 a.m. 3 p.m.

http://www.chicagomarathon.com/CMS40...osures_web.pdf