After coming back to ground level on Terminal Island, SR 47 becomes the locally maintained Seaside Avenue at the interchange with Ferry Street, where there was a toll plaza until 2000.

Ocean Boulevard leads east over the Gerald Desmond Bridge and becomes Interstate 710, with access to downtown Long Beach.

The one major at-grade intersection here is the split with Santa Fe Avenue north of Del Amo Boulevard, just south of the underpass where Alameda Street moves from the east to the west side of the rail line.

Crossings along this segment include the Century Freeway (I-105, no access), Imperial Highway, Firestone Boulevard (former SR 42), and Slauson Avenue.

[11] This roadway, which lay about halfway between Wilmington Avenue and Long Beach Boulevard, extended the existing Alameda Street, which ran along—to Slauson Avenue—and then west of the Southern Pacific Railroad's San Pedro Branch to Oris Street, the north limit of Compton.

There trucks could turn east and south to Terminal Island via Henry Ford Avenue, or continue southwest through Wilmington to San Pedro.

[19] Construction began in early 1946,[20] and the completed link was dedicated on January 10, 1948,[21] replacing the older Henry Ford Bridge.

This extension, which had been added to the state highway system in 1949 as part of Route 231,[30] included the 1963 Vincent Thomas Bridge.

[33][34][35] The two parts of SR 47 were, and still are, connected by the Los Angeles-maintained Seaside Avenue and Long Beach-maintained Ocean Boulevard.

[42] Due to the cancellation of the Industrial Freeway and planned port expansions, the Alameda Corridor project was created, including an improved rail line and a widening of Alameda Street from four to six lanes south of SR 91.

As part of a project to replace the Heim Bridge, Caltrans and the Alameda Corridor Transportation Authority plan to improve the connection near the south end of Alameda Street, possibly by building a new expressway replacement for SR 47 south of SR 1, or by extending SR 103 northwest via the originally-planned alignment to Alameda Street south of I-405.

[45] Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.