 Crossing the Steamboat Slough as a freeway, SR 529 interchanges with I-5 northbound as exit 198 and enters Marysville after crossing the Ebey Slough.Now named State Avenue, the street passes through the waterfront area of Downtown Marysville and the Marysville Mall before ending at the intersection with Fourth Street, signed as while State Avenue continues north to Smokey Point.Prior to 1991, SR 529 was shorter and extended from I-5 and 41st Street (exit 192) to Marysville via Broadway.