State Route 99 (SR 99) - Everett to Fife
Washington State Route 99 (SR99) is a highway that runs north-to-south on the West side of the Cascade Mountains between Everett and Fife. It is approximately 52 miles long. There is a two mile stretch of road in SeaTac and Tukwila that was dropped from the State Route designation. This section of road is known as International Boulevard in SeaTac and Tukwila International Boulevard in Tukwila.
In the southern section of the route, the highway is not always easily identifiable as the 99 as it is not clearly marked. Once the highway enters SeaTac near the Seattle Tacoma International airport, the highway becomes more identifiable. In Seattle, the highway is also known as East Marginal Way and becomes a freeway near the West Seattle Bridge and continues as the Alaskan Way Viaduct. The Alaskan Way viaduct is an elevated highway passing though Seattle's downtown core and along its waterfront.
One interesting note about SR 99 that at no point is it more than 5 miles west of Interstate-5. At SR-99's northern terminus, there is no direct on-ramp or connection to the I-5.
State Route 99 travels through King, Pierce and Snohomish counties. It goes through the cities of Des Moines, Edmonds, Everett, Federal Way, Fife, Kent, Lynnwood, Milton, SeaTac, Seattle, Shoreline, and Tukwila.