The Portland Marathon Presented by OHSU Health is an annual sporting event which takes place on the first Sunday of October in Portland, Oregon, first held in 1972. The race consists of a full marathon and a half marathon. The race starts and ends at the Tom McCall Waterfront Park at Salmon Street and Naito Parkway, and includes several bridge crossings and multiple iconic landmarks in Portland. The field has reached over 10,000 runners.