When completed in 1966 the Astoria-Megler bridge (Astoria, Oregon and Point Ellice, Washington) was the worlds longest continuous-truss bridge and completed the section of Highway 101 from the Mexico border to the Canadian Border.
Megler, Washington is a unincorporated community 3.1 miles away and does not have a US Census count, so critics at the time claimed "It was a bridge to nowhere."