Washington’s third diverging diamond interchange opening soon over I-5 in DuPont
Washington State Department of Transportation sent this bulletin at 02/23/2026 12:00 PM PST![]()
02/23/2026 10:51 AM PST
DUPONT – On the heels of opening the new southbound Interstate 5 exit 119 to Steilacoom-DuPont Road, crews are making final preparations to fully open the state’s third diverging diamond interchange. The new I-5 overpass will provide access between DuPont and Joint Base Lewis-McChord in Pierce County. Demolition of the old overpass is currently scheduled for April 3-4, and will require two overnight full closures of both north and southbound I-5.