A field of 1,500 runners from 40 states and five countries will be in Hood River on Sunday for this year’s Columbia Gorge Marathon.  The full marathon starts at 8:30 Sunday morning at the Mark O. Hatfield West trailhead near Hood River and travels to Rowena Crest and back to the Hood River Event Site.  The half-marathon starts an hour later from the Event Site to head up the same section of the Historic Columbia River Highway and then returning.  Event organizers are warning local residents that they may encounter traffic delays between about 10 a.m. and 1 p.m. Sunday at the intersection of Highway 35 and State Street, and heavy pedestrian traffic on the Mark O. Hatfield Trail between Hood River and Mosier throughout the day.