State Line Avenue

[1] State Line Avenue consists of two non-continuous portions, separated by a one-mile (1.6 km) gap directly south of the downtown area.

State Line Avenue's southern terminus is at Broad Street, but until 1980 it terminated at Texarkana Union Station.

At the west end of downtown, the "Texas Viaduct" carries traffic over a rail yard to South State Line Avenue.

Also at this interchange, US 59 ends its 3.5 miles (5.6 km) concurrency with I-30 by exiting the freeway from the west and traveling north along State Line Avenue/US 71.

Continuing north, State Line Avenue carries the US 59/US 71 concurrency until the Red River bridge.

State Line Avenue divides Texarkana between Texas to the west and Arkansas to the east.
State Line Avenue is the site of Texarkana's Federal Building and Courthouse , which physically occupies two states.