Texas State Highway 99
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| Grand Parkway | ||||
| Route information | ||||
| Length: | 85.5 mi (137.6 km) | |||
| Existed: | 1994 – present | |||
| Segment 1 | ||||
| Length: | 71 mi (114 km) | |||
| CCW end: |
  I-69 / US 59 in Sugar Land
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| CW end: |
I-69 / US 59 in New Caney
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| Segment 2 | ||||
| Length: | 14.5 mi (23.3 km) | |||
| CCW end: |
 I-10 in Mont Belvieu
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| CW end: |
  Bus. SH 146 in Baytown
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| Highway system | ||||
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State Highway 99, also known as the Grand Parkway, is a highway in Texas, United States which opened its first section in 1994. When State Highway 99 is complete, it will be the longest beltway in the U.S., and the third (outer) loop within Houston–The Woodlands–Sugar Land metropolitan area, with Interstate 610 being the first (inner) loop, and Beltway 8 (Sam Houston Tollway) being the second (middle) loop. The proposed 170-mile (270 km) loop has been divided into 11 separate segments for construction and funding purposes.
In 1926, SH 99 was a minimal highway from Fort Stockton to San Angelo. By 1933, SH 99 had extended to Alpine. By 1935, this route was transferred to SH 10. In 1960, a new route was made for SH 99, going from Denton to the Oklahoma line, replacing the old routing of SH 10. SH 10 then was changed to SH 99 to match OK 99 at its border. In 1968, this route became US 377.
Segment A is a planned segment that will go from SH 146 to I-45 South. The completion date is unknown.
Segment B Construction is planned to begin in 2019 and finish in late 2023. This segment extends from I-45 South to SH 288 South.
Segment C Construction began in August 2016 and will finish in late 2019. This segment extends from SH 288 South to I-69 / US 59 South.
Segment D, the first section opened, runs from just north of Interstate 10, west of Houston, south to Interstate 69/US 59 in Sugar Land where it terminates and intersects with FM 2759. The portion of this segment south of the interchange with the Westpark Tollway is now a four-lane divided highway feeder road, with maintains crossing over the Westpark Tollroad.
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