 SR 502 was established during the 1964 highway renumbering and codified in 1970 as the successor to the Mount Vista – Battle Ground section of SSH 1S , while US 99 was replaced by I @-@ 5 . 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 1 @.@ 46 miles ( 2 @.@ 35 km ) , however , the mileposts were not updated , as of 2011 . 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 . The entire highway was christened the " Battle Ground Highway " in May 2009 to signify the importance of SR 502 connecting the city of Battle Ground to I @-@ 5 . 
