The Gateway/Northeast 99th Avenue Transit Center, commonly known as Gateway Transit Center, is a TriMet bus transit center and light rail station on the MAX Blue, Green and Red Lines in Portland, Oregon, United States. It is the 14th stop eastbound on the current Eastside MAX. This station is where all three lines split, with Blue Line trains proceeding east to Gresham, Green Line trains proceeding south to Clackamas, and Red Line trains proceeding north to Portland International Airport. When opened in 1986, it was the busiest station on the Portland–Gresham MAX line, the only line in the system at that time, and was the terminus of 11 bus lines.