MAX Blue Line

The MAX Blue Line is a light rail line serving the Portland metropolitan area in the U.S. state of Oregon. Operated by TriMet as part of MAX Light Rail, it connects Hillsboro, Beaverton, Portland, and Gresham. The line serves 48 stations; it travels 33 miles (53 km) from Hatfield Government Center station in Hillsboro to Cleveland Ave station in Gresham. Service runs for 221⁄2 hours per day from Monday to Thursday, with headways of between 30 minutes off-peak and five minutes during rush hour. It runs later in the evening on Fridays and Saturdays and ends earlier on Sundays. The Blue Line is the busiest of the five MAX lines, having carried an average 55,370 riders each day on weekdays in September 2018.

The success of local freeway revolts in Portland in the early 1970s led to a reallocation of federal assistance funds from the proposed Mount Hood Freeway and Interstate 505 (I-505) projects to mass transit. Among various proposals, local governments approved the construction of a light rail line between Gresham and Portland in 1978. Referred to as the Banfield Light Rail Project during planning and construction as a part of the Banfield Freeway redevelopment, construction of what is now the Eastside MAX segment began in 1983. The line was inaugurated as the Metropolitan Area Express (MAX) on September 5, 1986.

Planning for an extension of MAX to the west side began as early as 1979. Known as the Westside MAX, construction was delayed by nearly a decade due to funding disagreements. Originally designed to terminate at 185th Avenue near the border of Hillsboro and Beaverton, proponents for a longer line achieved a supplemental extension to downtown Hillsboro just before groundbreaking in 1993. The Westside MAX opened in two phases following delays in tunnel construction; the first section up to Goose Hollow opened in 1997 while the rest opened on September 12, 1998.

In 2000, the two distinct segments, already operating as a single through route between Gresham and Hillsboro, were unified in passenger information as the Blue Line after TriMet introduced a color coding scheme in preparation for the opening of the Red Line to Portland International Airport. The Blue Line currently shares its route with the Red Line on the west side, between Hillsboro Airport/Fairgrounds station and Rose Quarter Transit Center. On the east side, it shares tracks with both the Red Line and the Green Line, between Rose Quarter Transit Center and Gateway/Northeast 99th Avenue Transit Center.