I-5 connects Portland with the Willamette Valley, Southern Oregon, and California to the south and with Washington to the north. I-405 forms a loop with I-5 around the central downtown area of the city and I-205 is a loop freeway route on the east side which connects to the Portland International Airport. U.S. 26 supports commuting within the metro area and continues to the Pacific Ocean westward and Mount Hood and Central Oregon eastward. U.S. 30 has a main, bypass, and business route through the city extending to Astoria to the west; through Gresham, Oregon, and the eastern exurbs, and connects to I-84, traveling towards Boise, Idaho. Portland ranked 13th in traffic congestion of all American cities. By 2018, it ranked 10th