to Broderick to the north and the formerly industrial area to the south, now containing Sutter Health Park. State maintenance resumes once again as SR 275 as the road crosses the Sacramento River on the Tower Bridge. At the east end of the bridge, SR 275 ends and the roadway becomes Capitol Mall, maintained by the city of Sacramento, and crosses over Interstate 5. Seven blocks later, the main road ends at 9th Street; the last block of Capitol Mall to 10th Street, on which the State Capitol fronts, is a two-lane road with a mid-block traffic circle around a fountain. SR 275 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. History SR 275 began as part of Legislative Route 6, one of the shorter main routes of the initial system funded by the 1910 bond issue. This highway, which included the several-mile-long Yolo Causeway, connected Sacramento with the north–south Route 7 at Davis, thereby linking the capital city with the San Francisco Bay Area. Route 6 traffic initially left Sacramento on the 1911 I Street Bridge, heading southwest through the small settlement of Washington via D Street, 5th Street, and present Tower Court to West Capitol Avenue. The state highway was moved to the M Street Bridge in 1926, as part of an improvement that also took it through a two-lane subway under the Sacramento Northern Railroad, still present on West Capitol Avenue. The M Street Bridge was replaced by the Tower Bridge in 1935. U.S. Routes 40 and 99 (soon 99W) were marked along Route 6 in 1928. These two routes remained on West Capitol Avenue until 1954, when the new West Sacramento Freeway opened, connecting the west end of the Tower Bridge with the east end of the Yolo Causeway. Traveler-oriented businesses along the bypassed West Capitol Avenue were hit hard by the shifting of through traffic. The entire freeway was designated as part of Interstate 80 in the late 1950s. However, two bypasses were planned — a realignment of Route 6 that would take I-80 over a new bridge and around the south side of downtown, and a northern bypass of the entire city (I-880). Since the southerly bypass had not been completed in time for the 1964 renumbering, the route over the Tower Bridge — and