SR 18
Route ID
018
Work begins Jan. 31 on third bridge near Tiger Mountain for SR 18 widening project
Plan ahead for single lane, alternating weeknight traffic through end of March
TIGER MOUNTAIN – The Interstate 90/State Route 18 Interchange Improvements project is approaching a major milestone, as work begins Wednesday, Jan. 31, on the last of three bridges needed to widen a 2-mile section of SR 18 just south of I-90.
Westbound chain-up area on SR 18 near Tiger Mountain to move farther east, closer to I-90
Roadway repairs on SR 18 finished ahead of wintry weather
SNOQUALMIE – Contractor crews working for the Washington State Department of Transportation will temporarily move the chain-up area on westbound State Route 18 to just east of the Raging River bridge in Issaquah.
Emergency repairs require daytime closure of SR 18 near Issaquah, Friday, Dec. 15
ISSAQUAH – People who use State Route 18 between Snoqualmie Pass and south King County will want to plan for alternative routes and extra travel time Friday, Dec. 15. Beginning at 4 a.m. until 2 p.m., the highway will close from Interstate 90 to Issaquah-Hobart Road Southeast for emergency asphalt repairs
During the closure, Washington State Department of Transportation maintenance crews will remove and repave damaged asphalt.
Temporary speed reductions on SR 18 between Tiger Mountain, I-90 begin Monday, Aug. 7
Lower speeds through late 2024 will support safety near construction zones
SNOQUALMIE – Construction along State Route 18 near Tiger Mountain has slowed traffic through the area since it began. With temporary speed limit reductions on the way next week, travelers should plan now for a little additional time for their trips through the end of next year.
Update: Overnight ramp closures, detours at I-5/SR 18 interchange May 3-5 and May 2 on SR 509
UPDATE: Work rescheduled for week of May 1
FEDERAL WAY – Evening travelers in south King County should add additional time or adjust routes the week of May 1 for ramp and/or lane closures in two locations, including State Route 509 and the Interstate 5/State Route 18 interchange in Federal Way.
Slow down on ice and snow.
It's easier to skid or lose control traveling at higher speeds. Give yourself more time to stop.
Carry chains, practice installing them.
Winter conditions could mean chains are required on your route. Practice putting them on your vehicle ahead of time.
Pack your winter car kit.
Carry extra supplies like warm clothing, ice scraper and brush, jumper cables and other emergency items.