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 | ![]() ![]() ![]() ![]() | |||
East end | ![]() | |||
Location | ||||
Country | United States | |||
State | Texas | |||
Highway system | ||||
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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.