During the early-20th century when the seaport was at its busiest and before the construction of the Bay Bridge, Pier 1, Pier 1½, Pier 3 and Pier 5 were dedicated chiefly to inland trade and transport. These connections facilitated the growth of communities in the Sacramento- and San Joaquin Valleys and fostered California's agricultural business. Today, these piers comprise the Central Embarcadero Piers Historic District. The "Delta Queen" docked at Pier 1½, ferrying people between San Francisco and Sacramento. There was once a pedestrian footbridge that connected Market Street directly with the Ferry building and a subterranean roadway to move cars below the plaza.