Texas State Highway 3
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| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 30.4 mi (48.9 km) | |||
| Existed: | 1939 – present | |||
| Major junctions | ||||
| South end: |
 SH 146 in La Marque
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 Beltway 8 near Ellington Field
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| North end: |
 I-45 in Houston
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State Highway 3, or SH 3, is a state highway in the U.S. state of Texas that runs from Interstate 45 in Houston near William P. Hobby Airport to State Highway 146, 9.9 miles (15.9 km) northwest of Galveston. For most of its length, SH 3 parallels I-45 and runs alongside the former Galveston, Houston and Henderson Railroad lines.
SH 3 begins in Galveston County, south of La Marque near the Texas City Industrial Complex at a junction with SH 146. The highway heads to the northwest through La Marque intersecting FM 519 and FM 1765 before an interchange with FM 1764 (Emmett F. Lowry Expressway). The highway roughly parallels to the east of I-45 as it heads towards Dickinson. In Dickinson, the highway intersects FM 517 and FM 646 before entering the League City city limits. In League City, SH 3 has junctions with SH 96 and FM 518, and head northwest into Harris County.
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