The Houston Chevron Marathon will be held Sunday, January 18, beginning at 7:00 a.m. The event results in numerous street closures including University Boulevard. The disruption affects mainly 8:30 a.m. and Sunday Church School participants. More than 20,000 participants, 200,000 spectators and 5,000 volunteers will take to the streets of Houston. The route from U.S. 59 South going south down Greenbriar will be clear.