 WSDOT constructed a new interchange between I-5 and 219th Street between April 2007 and October 2008 at a cost of $52 million.The new interchange and subsequent realignment shortened the total length of SR 502 by , however, the mileposts were not updated, .During construction of the interchange, WSDOT uncovered archaeological remains belonging to a Coast Salish settlement at Gee Creek that were at least 8,000 years old.