Washington State Route 523

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.

State Route 523
145th Street
A map of northern Seattle with SR 523 highlighted in red
Route information
Auxiliary route of I-5
Defined by RCW 47.17.727
Maintained by WSDOT
Length2.45 mi[1] (3.94 km)
Existed1991[2][3]–present
Major junctions
West end SR 99 in Seattle and Shoreline
  I-5 in Seattle and Shoreline
East end SR 522 in Seattle and Lake Forest Park
Highway system
← SR 522SR 524 →

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;[4] at the SR 99 intersection, the highway is named 145th Street.[1] 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.[1] 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.[1][5] 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.[4][6] The SR 523 / I-5 interchange was used by an estimated 28,000 motorists daily based on average annual daily traffic (AADT) data collected by the Washington State Department of Transportation.[7]

History

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.[1][8] During the 1964 highway renumbering, SSH 1J became SR 513 and PSH 1 became I-5;[9] the northern terminus of SR 513 became the current SR 523 / I-5 interchange.[10] In 1991, the northern terminus of SR 513 was moved south to its current location, Magnuson Park and SR 523 was established.[2][3]

Major intersections

The entire route is in King County.

Locationmi[1]kmDestinationsNotes
Seattle–Shoreline
city line		0.000.00Northwest 145th Street – Seattle
SR 99 (Aurora Avenue North) – Seattle, Lynnwood, Everett
0.951.53 I-5 – Seattle, Everett, BellinghamI-5 exit 175.
1.001.615th Avenue Northeast – Seattle, ShorelineFormer SR 513
2.453.94 SR 522 (Lake City Way Northeast) – Seattle, Bothell, Monroe
Northeast 145th Street – Seattle
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
  1. Washington State Department of Transportation (2006). "State Highway Log: Planning Report, SR 2 to SR 971" (PDF). Retrieved June 12, 2009.
  2. Washington State Legislature (1991). "RCW 47.17.727: State route No. 523". Retrieved June 12, 2009.
  3. Washington State Legislature (1991). "Engrossed Senate Bill 5801, Chapter 342, Laws of 1991". Retrieved June 12, 2009.
  4. King, Pierce and Snohomish Counties Street Guide (Map). 1:24,000. Thomas Guide. Cartography by NAVTEQ. Rand McNally. 2008. p. 504–505. § 504: 2J; 505: 2A, 2B, 2C, 2D, 2E. ISBN 0-528-86671-0.
  5. Washington State Department of Transportation (May 15, 2006). "SR 5 – Exit 175; Junction SR 523/NE 145th St" (PDF). Retrieved June 12, 2009.
  6. Google (June 12, 2009). "State Route 523" (Map). Google Maps. Google. Retrieved June 12, 2009.
  7. Washington State Department of Transportation (2007). "2007 Annual Traffic Report" (PDF). Retrieved June 12, 2009.
  8. Washington State Legislature (March 18, 1937). "Chapter 207: Classification of Public Highways". Session Laws of the State of Washington. Session Laws of the State of Washington (1937 ed.). Olympia, Washington: Washington State Legislature. p. 996. Retrieved June 12, 2009. (j) Secondary State Highway No. 1J; beginning at a junction with Primary State Highway No. 1 in the vicinity north of Seattle, thence in an easterly direction by the most feasible route to the vicinity of Lake Washington, thence in a southeasterly direction by the most feasible route to Seattle in the vicinity of the Naval Air Station at Sandpoint.
  9. C. G. Prahl (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission, Department of Highways. Retrieved June 12, 2009.
  10. Washington State Highway Commission, Department of Highways (1970). "Annual Traffic Report, 1970" (PDF). p. 194. Retrieved June 12, 2009.

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