In the late 1850s, the federal government began construction on a road connecting Fort Steilacoom in Pierce County to Fort Bellingham in Whatcom County. By the end of the decade, the military road had been finished (just in time for Fort Bellingham to close). The route it took through Seattle included what are now Beacon Avenue S, 1st Avenue, Dexter Avenue N, Westlake Avenue N, and Fremont Avenue N, among other streets. South of Seattle, much of the road still exists with its original name, but within the city limits, only a bit of Military Road S remains:
- A 750-foot-long stretch between Beacon Avenue S at 27th Avenue S and Van Asselt Elementary School south of S Myrtle Street
- A ½-mile-long stretch between S Othello Street just south of the school to the Union Pacific railroad tracks east of Airport Way S, just west of Interstate 5
