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I-5 - SR 161/SR 18 Triangle Improvements - Summer Ramp Closures

Drivers should expect three significant ramp closures this summer as part of the I-5/SR 161/SR 18 Triangle Project. The closures will allow crews to elevate two ramps 20 feet to make room for the new eastbound SR 18 to southbound I-5 flyover ramp.

  • May 31 - Sept. 1: Weyerhaeuser Way to westbound SR 18 ramp closed. Starting Sept. 1, a new ramp will take traffic from Weyerhaeuser Way directly to northbound I-5.
  • Aug. 8 - Sept. 1: Westbound SR 18 to northbound I-5 ramp closed
  • A previously scheduled weekend closure of the ramp from eastbound SR 18 to southbound I-5 has been canceled.

Weyerhaeuser Way to westbound SR 18 ramp closure     

Weyerhaeuser Way to westbound SR 18, Summer ramp closure
Traffic will be detoured onto eastbound SR 18 to the West Valley Highway (SR 181) and back to westbound SR 18.

Westbound SR 18 to northbound I-5 ramp closed     

Westbound SR 18 to northbound I-5, Summer ramp closure
Traffic will be detoured onto Highway 99 to S. 320th Street. Drivers coming from Auburn can use northbound SR 167 to SR 516.