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State Route 522 (SR 522) is a state highway in the U.S. state of Washington, serving the Seattle metropolitan area. The highway connects the city of Seattle to the northeastern suburbs of Kenmore, Bothell, Woodinville, and Monroe, traveling approximately 25 miles (40 km). Its western half is primarily an arterial street, named Lake City Way and Bothell Way, following 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.
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