 State Highway 100 | ||||
|---|---|---|---|---|
 SH 100 highlighted in red | ||||
| Route information | ||||
| Maintained byTxDOT | ||||
| Length | 24.61 mi[1] (39.61 km) | |||
| Existed | 1924[2]–present | |||
| Major junctions | ||||
| West end |     I-69E /US 77 /US 83 /FM 1421 atRusseltown | |||
| East end |  PR 100 at theQueen Isabella Memorial Causeway atPort Isabel | |||
| Location | ||||
| Country | United States | |||
| State | Texas | |||
| Highway system | ||||
| ||||
State Highway 100 (SH 100) is a Texas state highway that runs 24 miles (39 km) between "Russeltown" andPort 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 theQueen Isabella Memorial Causeway at Port Isabel. The route continues asTexas Park Road 100 east and north to a dead end onSouth Padre Island.
SH 100 was designated on September 15, 1924 on most of its current routing in Deep South Texas, but it ended at Gomez Street in Port Isabel.[3] Since its initial construction, the only two changes in the routing was on January 23, 1975, when SH 100 was extended east 0.5 miles replacing the section ofPR 100 from Gomez Street to the western end of the Queen Isabella Causeway, and thatSH 100 was rerouted the city of Port Isabel, where the route was transferred to separate one way surface streets to better handle flow onto the Queen Isabella Causeway
SH 100 begins at an intersection withInterstate 69E/U.S. Route 77/U.S. Route 83 and Farm to Market Road 1421 at unincorporated Russelltown (formerly known as Barreda). The route travels due east, passing through downtownLos Fresnos. The route continues east before turning northeast where it formerly met Old Port Isabel Road, which connected Brownsville and Port Isabel. At this point the route becomes a 4-lane divided highway. The route continues northeast and east around the northern edge of Bahia Grande before reaching the southernmost edge ofLaguna Vista. The route then turns southeast, running along the coast of theLaguna Madre. Continuing southeast, it passes through the town ofLaguna Heights, before reaching the city ofPort Isabel. It reaches its eastern terminus at the Queen Isabella Causeway, which continues across theLaguna Madre toSouth Padre Island asTexas Park Road 100.
The entire route is inCameron County.
| Location | mi[4] | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Brownsville | 0.0 | 0.0 |  FM 1421 south (Rice Tract Road) /I-69E /US 77 /US 83 | Western terminus; interchange; I-69E exit 14 | |
| 3.5 | 5.6 |  FM 803 (Olmito North Road) | |||
| | 5.1 | 8.2 |  FM 1575 (Old Alice Road) | ||
| Los Fresnos | 6.5 | 10.5 |  FM 1847 (Arroyo Boulevard) | ||
| Laguna Vista | 19.1 | 30.7 |  FM 510 (Santa Isabel Boulevard) | ||
| Port Isabel | 23.1 | 37.2 |   SH 48 west (Brownsville-Port Isabel Highway) –Brownsville | Eastern terminus of SH 48 | |
| Laguna Madre | Queen Isabella Causeway | ||||
| South Padre Island | 24.6 | 39.6 | PR 100 (Padre Boulevard) – Schlitterbahn Beach Waterpark | Eastern terminus | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
