Helen H. Richardson, The Denver Post
The 2016 Colfax Marathon. 
Getting your player ready...
Thousands of runners flocked to City Park Sunday morning for the , a race that spans from Lakewood to Aurora.
Streets will be either partially or completely closed until as late as 1 p.m. for the safety of the more than 19,000 athletes involved, according to a statement from race organizers.
The best places to cross Colfax Avenue will be Interstate 25, Federal Boulevard and Interstate 225. Organizers urged drivers to avoid Speer Boulevard and Colfax Avenue altogether. Drivers will only be allowed to cross Colfax Avenues on a limited basis at intersections with police officers.
Kaiser Permanente Colfax Marathon
Delays are expected in the yellow areas from 5:30 a.m. until noon.
