Texas State Highway 100

State Highway 100
SH 100 highlighted in red
Route information
Maintained by TxDOT
Length	24.61 mi[1] (39.61 km)
Existed	1924[2]–present
Major junctions
West end	I-69E / US 77 / US 83 / FM 1421 at Russeltown
East end	PR 100 at the Queen Isabella Memorial Causeway at Port Isabel
Location
Country	United States
State	Texas
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← SH 99 → SH 101

State Highway 100 (SH 100) is a Texas state highway that runs 24 miles (39 km) between "Russeltown" and Port Isabel. It was designated in 1926 along its current route. Its western terminus is at Interstate 69E/U.S. Highway 77/83 and ends at the western end of the Queen Isabella Memorial Causeway at Port Isabel. The route continues as Texas Park Road 100 east and north to a dead end on South Padre Island.