State Route 522 and 525 in Washington

Washington State Route 522

Get started Seattle
End monroe
Length 25 mi
Length 40 km

Lake Forest Park



→ Seattle Bypass

131st Avenue

Woodinville-Duvall Road

Woodinville-Snohomish Road

Paradise Lake Road

Echo Lake Road

Snohomish River

Old Snohomish-Monroe Road

According to, State Route 522 or SR-522 is a state route and partial freeway in the U.S. state of Washington. The highway is located in the north of the metropolitan area of ​​Seattle and forms an east-west connection between some northeastern suburbs and northern Seattle. The route is 40 kilometers long.

Travel directions

SR-522 begins as an urban highway in northern Seattle at Interstate 5. The road has about 4 lanes and clearly has a more important function than surrounding streets and roads. The road circles north of Lake Washington, then enters the suburban area. In the suburb of Bothell, the highway section begins from Interstate 405, the eastern bypass of the metropolitan area. The road has 2×2 lanes, and is a highway for about 15 kilometers. From Maltby the road is back to normal until the bridge over the Snohomish River. This is followed by a new stretch of freeway to US 2 in Monroe.


In the second half of the 19th century, places on the north side of Lake Washington began to emerge. Transport at that time mainly took place by water, but from 1890 road connections started to emerge. Thanks to the Good Roads Movement, construction of a paved road along Lake Washington began in 1903. The first seven-mile stretch between Seattle and Lake Forest Park was completed in 1907 and has been called one of the best roads in the United States. Between 1911 and 1913, a further 6 kilometers to Bothell were paved with clinker bricks. The entire road between Seattle and Bothell opened on January 10, 1914. This was also known as the Red Brick Road. The clinkers were replaced by asphalt in the first half of the 1930s.

In 1915, the road became part of the Pacific Highway between Seattle and Everett. In 1926 this became part of US 99. However, a year later a more direct connection opened between Seattle and Everett, over which US 99 was routed. As early as 1939, a section between Seattle and Lake Forest Park was widened to 4 lanes.

Plans were made in the 1940’s to extend the road to Monroe, but construction was delayed and was not finally completed until the first half of the 1960’s, a 13-kilometer stretch between Bothell and Monroe that was completed on February 10, 1965. opened. With the renumbering of 1964, the road was also numbered State Route 522.

In the second half of the 1960s there were plans to build the western section between Seattle and Bothell as a freeway, but these plans disappeared from regional road plans after 1973. Farther north, a super two bypass of downtown Monroe opened in 1972.

The motorway from Bothell to State Route 9 Maltby is believed to have been built in the 1970s. In the 1990s this was extended a bit to Maltby. On December 15, 2014, 7 kilometers of highway opened in Monroe, this section originally had 1×2 lanes and has been doubled to a freeway.


There is another single carriageway section between Maltby and the bridge over the Snohomish River. This is planned to be widened to freeway.

Traffic intensities

The highway section has a maximum of 82,000 vehicles per day, but this drops quickly towards the northeast.

Washington State Route 525

Get started Lynnwood
End Coupeville
Length 31 mi
Length 49 km
→ Seattle Bypass

Alderwood Mall Parkway

Evergreen Way


Mukilteo – Clinton




According to ACRONYMMONSTER, State Route 525 or SR-525 is a state route and partial highway in the U.S. state of Washington. The road forms a north-south route on the north side of the Seattle metropolitan area and runs from Interstate 405 in Lynwood to Coupeville, interrupted by a ferry service between Mukilteo and Clinton. The route is 49 kilometers long.

Travel directions

In Lynnwood, Interstate 405 continues as SR 525, while it intersects with Interstate 5. The highway then has 2×2 lanes and the highway section ends after a few kilometers at the Mukilteo Speedway. You then pass through Mukilteo, a suburb where various Boeing models are made. The road then ends at Mukilteo Harbor, where a ferry service takes the route to Clinton on Whidbey Island, an elongated island in the Puget Sound. The SR-525 then continues for another 30 kilometers to Coupeville, halfway around the island. The road ends here at State Route 20.


A ferry service between Mukilteo and Clinton on Whidbey Island was started in 1919. In 1937 the ferry service between the two parts became part of a branch of State Route 1. In 1964 the number State Route 525 was introduced.

In the 1980s, a super two opened between SR-99 and I-5 north of Seattle. This made it a continuation of I-405. This section was widened in the 1990s to a 2×2 lane highway.

Traffic intensities

The motorway is not very busy and actually only opens up the suburb of Mukilteo. Some 45,000 vehicles use the road at the busiest point.

Washington State Route 525