Washington State Route 522

State Route 522
SR 522 is highlighted in red.
Route information
Auxiliary route of I-5
Maintained by WSDOT
Length	24.64 mi[1] (39.65 km)
Existed	1964[2]–present
Major junctions
West end	I-5 in Seattle
Major intersections	SR 104 in Lake Forest Park I-405 in Bothell SR 9 near Woodinville
East end	US 2 in Monroe
Location
Country	United States
State	Washington
Counties	King, Snohomish
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 520 → SR 523

State Route 522 (SR 522) is a state highway in the U.S. state of Washington that serves the Seattle metropolitan area. Approximately 25 miles (40 km) long, it connects the city of Seattle to the northeastern suburbs of Kenmore, Bothell, Woodinville, and Monroe. Its western half is primarily an arterial street, named Lake City Way and Bothell Way, that follows the northern shore of Lake Washington; the eastern half is a grade-separated freeway that runs between Woodinville and Monroe. SR 522 connects several of the metropolitan area's major highways, including Interstate 5 (I-5), I-405, SR 9, and U.S. Route 2 (US 2).

The present-day route of SR 522 was built in stages between 1907 and 1965, beginning with the Red Brick Road from Seattle to Bothell, then part of the Pacific Highway and later US 99. The road later became a branch of Primary State Highway 2 (PSH 2) in 1937, and was extended east to Redmond and North Bend. A branch of the Stevens Pass Highway was built to connect PSH 2 in Bothell and Monroe in 1965, and was incorporated into SR 202 after it was designated in 1964. The Bothell–Monroe highway was re-designated as part of SR 522 in 1970, leaving SR 202 on the Bothell–North Bend highway.

Since the late 1990s, the SR 522 corridor between Woodinville and Monroe has been partially converted to a freeway to address safety concerns and a growing population. Portions of the highway near Woodinville and Monroe were widened between 2001 and 2014, while other sections near Maltby remain two lanes wide and undivided, with improvement projects left unfunded.