Florida State Road 518

Infobox FL State Road
type=FL
route=518
length_mi=
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formed=
dir1=
dir2=
from=
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previous_type=FL
previous_route=514
next_type=FL
next_route=519
browse=fl browse|previous_type=FL|previous_route=5023|route=|next_type=FL|next_route=5056

State Road 518, also called Eau Gallie Boulevard, is a short but major east-west highway with a western terminus at Interstate 95 on the Florida mainland, crossing the Indian River via the Eau Gallie Causeway (and intersecting the southern end of SR 513), and having its eastern terminus at SR A1A. With the exception of the extreme western end, SR 518 is located entirely within the city of Melbourne, Florida.

Eau Gallie Boulevard and the Eau Gallie Causeway were both named after a city that merged with Melbourne in 1969.

tate Road 5054

The original configuration of SR 518 was not entirely along Eau Gallie Boulevard as the western end of the road was not built when the Florida Department of Transportation signed the route; instead, SR 518 had its western terminus at I-95 but followed Sarno Road to U.S. Route 1 (SR 5), then followed US 1 (Harbour City Boulevard) to East Eau Gallie Boulevard and east to SR A1A via the Eau Gallie Causeway.

Upon the completion of West Eau Gallie Boulevard in the 1970s, the sign for the I-95 exit to SR 518 changed the name of the street from "Sarno Road" to "Eau Gallie Boulevard" and SR 518 was re-routed to its current configuration. The stretch of Sarno Road that was once SR 518 was redesignated by FDOT as State Road 5054, but did not erect any signs with this identification.

State Road 5054 is a major east-west highway in northern Melbourne (formerly Eau Gallie). Its western terminus is at SR 518 near North John Rodes Boulevard, less than a half mile east of I-95; its eastern terminus is an intersection with US 1.

The road west of I-95 is referred to as the "Sarno Extension".