State Highway 99 (Texas)
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| Grand Parkway | ||||
| Route information | ||||
| Maintained by TxDOT | ||||
| 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 that 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.
SH 99 was designated on August 18, 1924 from San Angelo to Fort Stockton. By 1933, SH 99 had extended to Alpine. By 1935, this route was transferred to SH 10. On October 29, 1960, a new route was made for SH 99, going from Denton to the Oklahoma line as a renumbering of SH 10, ironically, to match OK 99 at its border. On April 29, 1968, this route became part of US 377. On October 25, 1984, SH 99 was designated along a very similar route, but ending at SH 146 (Loop 201 until March 28, 1996) and Spur 330. On March 28, 2002, SH 99 was rerouted further east along a new route south to Spur 55 and along Spur 55 to Business SH 146. Spur 55 was cancelled, but it was not effective until completion of that section of SH 99 in 2008.
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