CHICAGO - The Chicago Marathon will step off on Sunday when thousands of runners will traverse 26.2 miles from the city’s downtown, through the North Side, the Near West Side, and the South Loop.

The first wave of competitors will start as early as 7:20 a.m., which means major street closures along the course starting bright and early.

Here is what you need to know if you’ll be in the city on Sunday.

Street closures

What we know:

Anticipated street closures for the race will begin around 4 a.m., according to the Chicago Marathon website.

Other main roads are expected to remain open during the event, although additional street closures might be necessary if marathon officials deem it necessary.

Grant Park street closures:

Balbo Drive from Columbus to DuSable Lake Shore Drive has b

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