PORTLAND The 40th Annual Portland Marathon starts Sunday at 7 a.m. and traffic throughout the city will be impacted from 6 a.m. until 3 p.m.

Click for the Portland Marathon 2011 start and finish line maps

Organizers identified the core area as downtown Portland, where SW 3rd and SW 4th avenues will be closed from SW Columbia Street to SW Taylor Street, SW Main and SW Madison streets will be closed SW 3rd Avenue to SW 5th Avenue, and SW Salmon will be closed from SW Naito Parkway to SW 5th Avenue. They said drivers should avoid the area Sunday if possible.

Click here for a complete list of Portland Marathon road closures

The St Johns Bridge will be down to one lane in each direction from 7 a.m. until 1:30 p.m. The westbound lanes of the Broadway, Morrison and Burnside bridges will also be closed temporarily during the race.

Portland Marathon forecast

The marathon course is closed to all unauthorized vehicular and bicycle traffic, with no exceptions.

More than 21,000 runners and walkers from every state, and from 22 countries were expected to participate, according to Katie Edlin. She said more than 5,100 volunteers would assist with the event.

Click for a complete schedule of 2011 Portland Marathon events

The Portland Marathon is ranked as one of the top ten largest marathons in the United States, and among the top 10 distance-running events in the world by Runner's World, she added. The publication also named the event one of the best organized and greenest marathons in the country.

Click here for a complete map of the marathon route

Portland Marathon organizers tentatively agreed Friday to share space reserved for the event with protesters in the Occupy Portland movement.

Related: Cooperation likely between Occupy Portland, marathonadd to reading list

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