transport: Transportation in Seattle

Evidence: 72 • authority: 72

Interstate 5 (I-5) is an Interstate Highway on the West Coast of the United States that serves as the region's primary north–south route. It spans 277 miles (446 km) across the state of Washington, from the Oregon state border at Vancouver, through the Puget Sound region, to the Canadian border at Blaine. Within the Seattle metropolitan area, the freeway connects the cities of Tacoma, Seattle, and Everett. I-5 is the only interstate to traverse the whole state from north to south and is Washington's busiest highway, with an average of 274,000 vehicles traveling on it through Downtown Seattle on a typical day. The segment in Downtown Seattle is also among the widest freeways in the United St…

Evidence: 27 • authority: 72

Sounder (reporting mark SDRX) is a commuter rail system that serves the Seattle metropolitan area in the U.S. state of Washington. Managed by Sound Transit, it uses 82 miles (132 km) of tracks, primarily owned by operator BNSF Railway, and runs with equipment maintained by Amtrak. Sounder is split into two lines that intersect at King Street Station in Seattle: the N Line to Everett and the S Line to Tacoma and Lakewood. Trains typically operate during peak periods, with morning trips to Seattle and afternoon trips to outlying suburbs. Limited mid-day service is offered on the S Line, and both lines offer special weekend trips for sporting events and other major events. Sounder has 12 stati…

Evidence: 27 • authority: 72

The Central Puget Sound Regional Transit Authority, branded as Sound Transit (ST), is a public transit agency serving the Seattle metropolitan area in the U.S. state of Washington. It manages the Link light rail system in Seattle and Tacoma, regional Sounder commuter rail, and Sound Transit Express bus service. The agency also coordinates with the regional ORCA fare card system used by transit operators across the metropolitan area. In 2025, Sound Transit services carried approximately 51 million total passengers and averaged over 153,000 riders on weekdays. The agency was created in 1993 by King, Pierce and Snohomish counties to build a regional rapid transit system. After an unsuccessful…

Evidence: 27 • authority: 72

The 2 Line is a light rail line serving the Seattle metropolitan area in the U.S. state of Washington. It is part of Sound Transit's Link light rail system and runs for 33 miles (53 km), connecting Snohomish County and Seattle to the Eastside region of King County. The line has fourteen stations it shares with the 1 Line between Lynnwood and Downtown Seattle; the 2 Line then serves twelve standalone stations in Seattle, Mercer Island, Bellevue, and Redmond. The project to build the 2 Line, originally named the East Link Extension, was approved by voters in the 2008 Sound Transit 2 ballot measure. Its construction costs were projected at $3.7 billion. The line uses the Homer M. Hadley Memori…

Evidence: 22 • authority: 88

Puget Sound Metropatterns: Social Separation and Sprawl in the Puget Sound Region. This research identifies the suburban typology of the Puget Sound area through a study of the social and fiscal disparities within the region. Municipal tax base and other demographic data, such as poverty rates measured at the school-level, are used to show wide variations in the capacities of suburban municipalities to provide local public services. The results show clear signs of current fiscal and social stress in the region. A range of regional fiscal, planning, and governance reforms are also evaluated.

Evidence: 22 • authority: 72

The Puget Sound faults under the heavily populated Puget Sound region (Puget Lowland) of Washington state form a regional complex of interrelated seismogenic (earthquake-causing) geologic faults. These include (from north to south, see map) the: Devils Mountain Fault Strawberry Point and Utsalady Point faults Southern Whidbey Island Fault (SWIF) Rogers Belt (Mount Vernon Fault/Granite Falls Fault Zone) Cherry Creek Fault Zone Rattlesnake Mountain Fault Zone Seattle Fault Tacoma Fault Saddle Mountain Faults Olympia structure (suspected fault) Doty Fault Saint Helens Zone and Western Rainier Zone

Evidence: — • authority: 72

SkyTrain is the medium-capacity rapid transit system serving the Metro Vancouver region in British Columbia, Canada. SkyTrain has 79.6 km (49.5 mi) of track and uses fully automated trains on grade-separated tracks running on underground and elevated guideways, allowing SkyTrain to hold consistently high on-time reliability. In 2025, the system had an annual ridership of 146,789,800, or about 450,400 per weekday as of the second quarter of 2026, making it the 7th busiest metro system in North America and the 5th busiest in Canada and the US. The name "SkyTrain" was coined for the system during Expo 86 because the first line (Expo) principally runs on elevated guideway outside of Downtown Va…

Evidence: — • authority: 72

The Amtrak Cascades is a passenger train route in the Pacific Northwest, operated by Amtrak in partnership with the U.S. states of Washington and Oregon. It is named after the Cascade mountain range that the route parallels. The 460-mile (740 km) corridor runs from Vancouver, British Columbia, through Seattle, Washington, and Portland, Oregon, to Eugene, Oregon. As of December 2023, seven round trips operate along the corridor each day: one Vancouver–Seattle, one Vancouver–Seattle–Portland, three Seattle–Portland, and two Seattle–Portland–Eugene. No train travels the entire length of the corridor. For trains that do not travel directly to Vancouver or Eugene, connections are available on Am…

Evidence: — • authority: 72

The Pacific Northwest Corridor or the Pacific Northwest Rail Corridor is one of eleven federally designated higher-speed rail corridors in the United States and Canada. The 466-mile (750 km) corridor extends from Eugene, Oregon, to Vancouver, British Columbia, via Portland, Oregon and Seattle, Washington, in the Pacific Northwest region. It was designated a high-speed rail corridor on October 20, 1992, as the one of five high-speed corridors in the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA).

Evidence: — • authority: 72

Interstate 5 (I-5) is the main north–south Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels through the states of California, Oregon, and Washington, serving several large cities on the West Coast, including San Diego, Los Angeles, Sacramento, Portland, and Seattle. It is the only continuous Interstate highway to connect the Mexican and Canadian borders. Upon crossing the Mexican border at its southern terminus near San Diego, the highway continues to Tijuana, Baja California as Mexican Federal Highway 1 (Fed. 1). Upon crossing the Canadian border at its northern terminus in Blai…

Evidence: — • authority: 72

Portland International Airport (IATA: PDX, ICAO: KPDX, FAA LID: PDX) is a joint civil–military airport and the largest airport in the U.S. state of Oregon, accounting for 90% of the state's passenger air travel and more than 95% of its air cargo. It is within Portland's city limits just south of the Columbia River in Multnomah County, 6 miles (10 kilometers) by air and 12 mi (19 km) by highway northeast of downtown Portland. Portland International Airport is often referred to by its IATA airport code, PDX. The airport covers 3,000 acres (1,214 ha) of land. Portland International Airport has direct flights to cities throughout the United States and in several other countries, including Canad…

Evidence: — • authority: 72

Olympia is the capital city of the U.S. state of Washington. The population was 55,605 at the 2020 census, while the Olympia metropolitan statistical area has an estimated 300,000 residents. Olympia is the county seat of Thurston County and anchors the South Puget Sound region of western Washington, 50 miles (80 km) southwest of Seattle. The Squaxin and other Coast Salish peoples inhabited the southern Puget Sound region prior to the arrival of European and American settlers in the 19th century. The Treaty of Medicine Creek was signed in 1854 and followed by the Treaty of Olympia in 1856; these two treaties forced the Squaxin to relocate to an Indian reservation. Olympia was declared the ca…