State Highway 99
, also known as the Grand Parkway
, is a Texas highway
, which opened its first section in 1994
. When State Highway 99 is complete, it will be the longest beltway in the world, and the third loop
within the Houston–Sugar Land–Baytown
metropolitan area, with Interstate 610
being the inner loop, and Beltway 8
(Sam Houston Tollway) being the middle loop. The proposed loop has been divided into 11 separate segments for construction and funding purposes. Only two of the 11 segments are complete. As of May 7, 2010, most segments of the planned highway have been fully funded.
In 1926, SH 99
a minimal highway from Alpine to San Angelo. By 1936, this route was transferred to SH 10. In 1960, a new route was made for SH 99
, going from Denton to the Oklahoma border, replacing the old route of SH 10. SH 10 was changed to SH 99 to match Oklahoma's SH 99 at the State Line. In 1968, this route was transferred to US 377.
, the first section opened, runs from just north of Interstate 10
, west of Houston, south to 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 currently a four-lane divided highway, which will become feeder roads
once the main lanes are constructed. The section north of the Westpark Tollway intersection is currently a four-lane controlled-access freeway.