The Texas Department of Transportation said some exits on I-35 will be closed due to the Silo District Marathon .
The marathon will start a little after 7 a.m.
The first part of the routes for both the marathon and half-marathon will cross under I-35 at MLK Blvd. and University Parks Dr.
Some of the off-ramps in that area will be closed from 6 a.m. to 10 a.m.
Exit 335B and 335 C southbound will be closed, along with 335B on the northbound side.
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