Washington State Route 523
State highway in King County, Washington, US
State Route 523 (SR 523, named 145th Street) is a short Washington state highway located on the city limits of Seattle, Shoreline, and Lake Forest Park in King County. The road itself runs 2.45 miles (3.94 km) east from SR 99 past Interstate 5 (I-5) and ends at SR 522; the highway was first established in 1991, but the roadway from I-5 to 5th Avenue Northeast was once the northern section of Secondary State Highway 1J from 1937 until 1964 and later SR 513 from 1964 until 1991.
Route description
State Route 523 (SR 523) begins at an intersection with SR 99 and North 145th Street at the northern Seattle and southern Shoreline city limits; at the SR 99 intersection, the highway is named 145th Street. From its western terminus, the roadway travels east to 1st Avenue NE, where SR 523 becomes Northeast 145th Street, which the road keeps until its eastern terminus. The highway travels 0.20 miles (0.32 km) east to interchange with Interstate 5 (I-5), where the northbound ramps are accessed through nearby 5th Avenue Northeast. After the I-5 interchange, the road forms the northern boundary of the Jackson Park Golf Course and later continues to SR 522 at the northern Seattle, southern Shoreline and western Lake Forest Park city limits. The SR 523 / I-5 interchange was used by an estimated 28,000 motorists daily based on annual average daily traffic (AADT) data collected by the Washington State Department of Transportation.
History
145th Street was paved by the King County government between 1934 and 1935. The Washington State Legislature first established a state-maintained highway on a section of present-day SR 523 in 1937, with the establishment of Secondary State Highway 1J (SSH 1J), which ran from Downtown Seattle to Primary State Highway 1 (PSH 1) in North Seattle, via the current 0.05-mile (0.08 km) long section of SR 523 from I-5 to 5th Avenue Northeast. During the 1964 highway renumbering, SSH 1J became SR 513 and PSH 1 became I-5; the northern terminus of SR 513 became the current SR 523 / I-5 interchange.
“Washington State Route 523” enters the record as state highway in King County, Washington, US. Crown Archives preserves that source wording while asking what Washington, State and Route can confirm, complicate or overturn.
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“Washington State Route 523” is worth following because a concise public description often conceals a longer documentary argument. Here, Washington, State and Route provides the most credible route into that argument.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Aug 6, 2025. The linked authority identifier is Q836755. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1991, 1937, 1964 and 1934.
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This entry incorporates text from “Washington State Route 523” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.