Under Interstate 5 for a couple of miles in Seattle along Airport way.  

Under the 12th Street Bridge, and Dearborn Ave.  

Under 45th street next to University Village  

Under Highway 509 at the intersection of Hwy 99 and 509 and W. Marginal Way.  

Under Hwy 99 at South Hanford Street  

Under Hwy 99 at South Atlantic Street  

Under I-5 at 40th Street  

Under I-5 and Spokane St.  

Under I-5 at Shelby St.  

I-90 next to Rainer Ave. and Goodwill  

Under I-90 near Safeco Field  

Under West Seattle Bridge at Duwammish street  

Site on Mercer Island:
Under I-90 on Mercer Island (West side)  

Site in Bellevue:
Under I-90 in Bellevue (West side)