State Route 519 (SR 519) is a state highway in Seattle, Washington, United States. It connects Interstate 90 (I-90) to the Port of Seattle and Colman Dock, which serves as the terminus of two ferry routes. The highway travels along city streets, including two named for Seattle Mariners personalities: Edgar Martinez Drive and Dave Niehaus Way, as well as Alaskan Way. SR 519 was established in 1991 on preexisting streets that were first built in the early 20th century. State projects moved the southern terminus of SR 519 in 2010 to its current location and temporarily rerouted it during demolition of the Alaskan Way Viaduct. Route description SR 519 begins as Edgar Martinez Drive, named for former Seattle Mariners player Edgar Martínez, in the SoDo neighborhood south of Downtown Seattle. The highway begins at an elevated intersection with 4th Avenue and the western terminus of I-90. The highway travels west over BNSF Railway tracks, heading north to King Street Station, and turns north onto Dave Niehaus Way, named for former Mariners sportscaster Dave Niehaus, at an intersection with South Atlantic Street. Dave Niehaus Way continues north along the west side of T-Mobile Park and Lumen Field before becoming 1st Avenue. SR 519 turns west onto South Dearborn Street and north onto Alaskan Way at an intersection with ramps serving SR 99 at the south portal of its downtown tunnel. The highway ends at an intersection with Yesler Way at Colman Dock (Pier 52), which is served by two state ferry routes to Bremerton and Bainbridge Island. Alaskan Way continues north along the city's waterfront towards Lower Queen Anne. The highway primarily serves as a connector to Colman Dock, the Port of Seattle, and the city's waterfront. Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. Average traffic volumes on the highway in 2019 ranged from a minimum of 12,000 vehicles on Alaskan Way near Colman Dock to a maximum of 33,000 vehicles on 1st Avenue near T-Mobile Park. The state government has designated SR 519 as a Highway of Statewide Significance, which includes principal arterials that are needed to connect major communities in the state. History SR 519 was codified