The 2017 USA Triathlon Collegiate Club & High School National Championships began Friday morning in downtown Tuscaloosa.

Jack Warner Parkway is closed to traffic from 6 a.m. until 6 p.m. Friday and Saturday for the races.

More than 1,300 collegiate athletes from 120 clubs and more than 130 high school triathletes will compete Friday and Saturday.

The action began Friday at 8:15 a.m. with the fifth-annual Draft-Legal Collegiate Championships, where athletes  compete over a 750-meter swim, five-lap, 20.2-kilometer bike and 5-kilometer run course. The collegiate men will race first, followed by the collegiate women at 10 a.m.

 Also on the docket for Friday is the second annual High School National Championships. Athletes will compete in sprint-distance event featuring a 750m swim, three-lap, non-drafting 20.25k bike and 5K run course. The boys’ high school race will begin at 12 p.m., and the girls’ race will follow at 1 p.m. The High School Nationals race was contested for the first time last year in Clemson, South Carolina.

 Racing continues on Saturday with the marquee Collegiate Club National Championships Olympic-distance race, which has long been a staple of the Collegiate Club Nationals program. Athletes will cover a 1,500m swim, non-drafting 40K bike, 10K run course, with the men starting at 7:30 a.m. and women starting at 10:20 a.m.

To accommodate the competition, the following roads and walkways will be closed on Friday from 6 a.m. to 2 p.m.: Jack Warner Parkway from 28th Avenue to McFarland Boulevard; on and off ramps at McFarland Boulevard and Jack Warner Parkway; 28th Avenue from Jack Warner Parkway to University Boulevard;  and Tuscaloosa Riverwalk from Tuscaloosa Amphitheater to the River Market.

And the following roads and walkways will be closed on Saturday from 5 a.m. to 6 p.m.: Jack Warner Parkway from 28th Avenue to Crescent Ridge Road; on and off ramps at McFarland Boulevard and Jack Warner Parkway; Paul Bryant Bridge from Jack Warner Parkway to Rice Mine Road Northeast; Tuscaloosa Riverwalk from Tuscaloosa Amphitheater to the Boathouse at Manderson Landing.