Ridership Patterns for Sound Transit Route 522

Sound Transit Route 522 travels inbound from Woodinville to Roosevelt station, primarily via SR-522. This express service has stops in Bothell, Kenmore and Lake City. Outbound trips travel in the reverse direction. In June 2025, Route 522 had 2,318 average weekday boardings.

Route 522 Map (Sound Transit)

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per Route 522 Trip: September 2024 to March 2025. “Inbound” is toward Roosevelt station; “Outbound” is toward Woodinville P&R. Click the plot to view at full-resolution in a new tab.

Route 522 is an essential Link connector for Lake City, UW Bothell, and Woodinville. Some observations:

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Friday Roundtable: Boren Ave Route Idea

One of the most significant transit gaps in Seattle is on Boren Ave between Jackson Street and Denny Way. Boren Ave is aligned with the downtown grid and runs through the heart of First Hill. The avenue is unique as it is the only road connects South Lake Union (SLU), First Hill, and Little Saigon. The current transit network in the area is still focused on getting people to and from downtown Seattle. Over ten Metro and Sound Transit routes intersect Boren Ave, heading to and from downtown. A route along Boren would connect these many routes and provide a direct route between the International District, First Hill, and South Lake Union.

Downtown Seattle Transit Map with Boren Ave Circled (Screenshot from Seattle Transit Map)

Running a bus on Boren is not a new idea. Today, peak hour express routes 193, 303, 322, and 630 have stops on Boren. This proposal is focused on adding an all-day, frequent bus route. Over the past 15 years, several STB posts have proposed rerouting a bus to Boren Ave, including Route 7 and Route 106. These proposals are still valid ideas; however, today’s route proposal focuses on a different route: Route 40.

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Friday Roundtable: Metro Trolley Wire Map

While most people looking at the sky today are hoping to see fireworks, I prefer to look at overhead trolleybus wires. The map below outlines the location of all trolleybus wires in Seattle. This dataset was created by King County and last updated in 2018. While the map has not been updated in 7 years, it is still mostly up to date. The biggest change not reflected in the map is the removal of trolley wire from Madison St from the RapidRide G Line construction. The official map and dataset is available here.

Many of the trolley bus routes that run today are immediately identifiable. Looking past the wires that are used by today’s routes, the map shows two other types of overhead wire: deprecated route wire and what I’m calling “utility wire”.

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Ridership Patterns for East Link Connections

In preparation for the upcoming openings of Sound Transit’s Downtown Redmond Link Extension and full East Link Extension, King County Metro has outlined the planned changes to its Eastside network. Full details of the changes were previously covered on the Blog. Most of the changes in this restructure will take effect when the full 2 Line opens, likely in the fall or winter this year. This post will look at the ridership patterns for the existing routes impacted by the proposed restructure. Metro collects ridership data for most routes; however, data is not collected for routes 204, 224, 232, 630, 930, and 931.

Final East Link Connections Map from King County Metro
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Ridership Patterns for RapidRide B Line

King County Metro’s RapidRide B Line travels inbound from Redmond to Bellevue via Overlake and Crossroads. Outbound trips travel in the reverse direction. In January 2025, the B Line had 4,531 average weekday boardings.

The data shown in the plots below were collected between March and September 2024. Sound Transit’s Link 2 Line started operating on April 27, 2024 and runs between South Bellevue and Redmond Technology. The B Line and Link 2 Line intersect at Downtown Bellevue and Redmond Technology stations. This likely resulted in some ridership pattern changes; however, overall B Line ridership remained fairly consistent month to month around the time of 2 Line opening. Sherwin Lee discussed the initial 2 Line ridership data in August 2024.

B Line Map from King County Metro

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per B Line Trip: March 2024 to September 2024. “Inbound” is toward Bellevue Transit Center; “Outbound” is toward Redmond Transit Center. Click the plot to view at full-resolution in a new tab.
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Ridership Patterns for RapidRide F Line

King County Metro’s RapidRide F Line travels inbound (westbound) from Renton to Burien, via the Westfield Southcenter mall and Tukwila International Boulevard Station. Outbound (eastbound) trips travel in the reverse direction. In October 2024, the F Line had 5,107 average weekday boardings.

F Line Map from King County Metro

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per F Line Trip: March 2024 to September 2024. “Inbound” is toward Burien Transit Center; “Outbound” is toward Renton. Click the plot to view at full-resolution in a new tab.
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Ridership Patterns for King County Metro Route 44

King County Metro’s Route 44 travels inbound from Ballard to UW Station via Wallingford and the University District. Outbound trips travel in the reverse direction. In October 2024, Route 44 had 6,663 average weekday boardings.

Route 44 Map from King County Metro

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per Route 44 Trip: March 2024 to September 2024. “Inbound” is toward UW Station; “Outbound” is toward Ballard. Click the plot to view at full-resolution in a new tab.
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Ridership Patterns for RapidRide A Line

King County Metro’s RapidRide A Line travels inbound from the Federal Way Transit Center to Tukwila International Boulevard Station, primarily along State Route 99. Outbound trips travel in the reverse direction. In November 2024, the A Line was the third busiest bus route in King County with 9,407 average weekday boardings. 

As noted in a 2023 STB article by Andrew Bowen, the A Line is one of the most efficient Metro routes in terms of Rides per Platform Hour. This metric tracks how many people use the route for every hour a bus is operating it. Given the ridership data below, this is not too surprising. The A Line is heavily used for shorter trips and almost every stop has a few passengers boarding or alighting per trip.

A Line Map

Average Ridership Per Trip

For the first time in this series, the data shown in the graphs were collected during the Spring 2024 service change, from March 30, 2024 to September 14, 2024. The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per A Line Trip: March 2024 to September 2024. “Inbound” is toward Tukwila International Blvd Station; “Outbound” is toward Federal Way Transit Center. Click the plot to view at full-resolution in a new tab.
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Ridership Patterns for King County Metro Route 40

King County Metro’s Route 40 travels inbound from Northgate Station to downtown Seattle via Crown Hill, Ballard, Fremont, and South Lake Union. Outbound trips travel in the reverse direction. In October 2024, Route 40 had 8,539 average weekday boardings.

Route 40 Map from King County Metro

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per Route 40 Trip: March 2023 to March 2024. “Inbound” is toward downtown Seattle; “Outbound” is toward Northgate Station. Click the plot to view at full-resolution in a new tab.
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Ridership Patterns for RapidRide H Line

King County Metro’s RapidRide H Line travels inbound from Burien to downtown Seattle, via White Center and Delridge. Outbound trips travel in the reverse direction. The H Line launched in March 2023, replacing Route 120. In October 2024, the H Line had 8,636 average weekday boardings.

H Line Map from King County Metro

Average Ridership Per Trip

The plots below show the average weekday ridership by stop in each direction, color-coded by time of day. For a more detailed breakdown of how the plots are set up, please refer to the How to Read the Plots section of the article discussing Route 70.

Average Weekday Ridership per H Line Trip: March 2023 to March 2024. “Inbound” is toward downtown Seattle; “Outbound” is toward Burien Transit Center. Click the plot to view at full-resolution in a new tab.
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