The Yellow Line serves the Interstate MAX extension, which is 5.8 miles (9.3 km) long.
Its northern terminus is Expo Center station, situated on the east end of the Portland Expo Center parking lot.
From there, the line heads south adjacent to North Expo Road.
Before Delta Park/Vanport station, the alignment gradually elevates as it enters a 3,850-foot-long (1,170 m) viaduct, which crosses over North Victory Boulevard, North Interstate Avenue, the Columbia Slough, and North Columbia Boulevard before approaching a level crossing on North Argyle Street.
Just south of Kenton/North Denver Avenue station, the tracks enter the median of North Interstate Avenue and proceed south towards Interstate/Rose Quarter station at the Rose Quarter.
The Interstate MAX connects with the Eastside MAX segment at the east end of the Steel Bridge, where Yellow Line trains continue west across the Willamette River and into downtown Portland via the Northwest Glisan Street ramp.
A wye just south of Union Station splits the double-tracks to establish the northern end of the Portland Transit Mall on 5th and 6th avenues.

On the Portland Transit Mall, southbound Yellow Line trains through operate into the Orange Line bound for Milwaukie at Union Station/Northwest 5th & Glisan station on 5th Avenue.
Conversely, Yellow Line trains serve the northbound 6th Avenue segment as through-routed continuations of the Orange Line from PSU South/Southwest 6th and College station alongside Green Line trains.
Near PSU Urban Center/Southwest 6th & Montgomery station, MAX tracks cross with the Portland Streetcar, which serves a stop on Southwest Mill Street.
Between the Pioneer Courthouse and Pioneer Courthouse Square at Pioneer Courthouse/Southwest 6th station, the 6th Avenue MAX line intersects with east–west MAX lines on Yamhill and Morrison streets, facilitating a transfer to the Pioneer Square South and Pioneer Square North stations.
The line continues northward, entering Northwest Portland after passing West Burnside Street, eventually reaching the north end of the transit mall at Union Station/Northwest 6th and Hoyt station.

From its opening in 2004 until 2009, the Yellow Line followed the Eastside MAX alignment from the east end of the Steel Bridge to the 11th Avenue tracks in downtown Portland, serving the stations from Old Town/Chinatown to Library and Galleria alongside Blue and Red line trains.
It was rerouted to the Portland Transit Mall in August 2009 after the addition of light rail to 5th and 6th avenues.
The Yellow Line serves the Interstate MAX extension, which is 5.8 miles (9.3 km) long. Its northern terminus is Expo Center station, situated on the east end of the Portland Expo Center parking lot. From there, the line heads south adjacent to North Expo Road. Before Delta Park/Vanport station, the alignment gradually elevates as it enters a 3,850-foot-long (1,170 m) viaduct, which crosses over North Victory Boulevard, North Interstate Avenue, the Columbia Slough, and North Columbia Boulevard before approaching a level crossing on North Argyle Street. Just south of Kenton/North Denver Avenue station, the tracks enter the median of North Interstate Avenue and proceed south towards Interstate/Rose Quarter station at the Rose Quarter. The Interstate MAX connects with the Eastside MAX segment at the east end of the Steel Bridge, where Yellow Line trains continue west across the Willamette River and into downtown Portland via the Northwest Glisan Street ramp. A wye just south of Union Station splits the double-tracks to establish the northern end of the Portland Transit Mall on 5th and 6th avenues.
On the Portland Transit Mall, southbound Yellow Line trains through operate into the Orange Line bound for Milwaukie at Union Station/Northwest 5th & Glisan station on 5th Avenue. Conversely, Yellow Line trains serve the northbound 6th Avenue segment as through-routed continuations of the Orange Line from PSU South/Southwest 6th and College station alongside Green Line trains. Near PSU Urban Center/Southwest 6th & Montgomery station, MAX tracks cross with the Portland Streetcar, which serves a stop on Southwest Mill Street. Between the Pioneer Courthouse and Pioneer Courthouse Square at Pioneer Courthouse/Southwest 6th station, the 6th Avenue MAX line intersects with east–west MAX lines on Yamhill and Morrison streets, facilitating a transfer to the Pioneer Square South and Pioneer Square North stations. The line continues northward, entering Northwest Portland after passing West Burnside Street, eventually reaching the north end of the transit mall at Union Station/Northwest 6th and Hoyt station.
From its opening in 2004 until 2009, the Yellow Line followed the Eastside MAX alignment from the east end of the Steel Bridge to the 11th Avenue tracks in downtown Portland, serving the stations from Old Town/Chinatown to Library and Galleria alongside Blue and Red line trains. It was rerouted to the Portland Transit Mall in August 2009 after the addition of light rail to 5th and 6th avenues.
MAX Yellow Line