State Highway 99 (SH 99, the Grand Parkway) is a proposed 180+ mile circumferential scenic highway traversing seven counties and encircling the Greater Houston region. The project has been shown on governmental planning documents since the early 1960's.

Currently, the 19.5- mile Segment D, from US 59 near Sugar Land to IH 10 near Katy, has been constructed and serving as a toll free road open to the traveling public since August 31, 1994.

Additional Phase I of Segment I-2, from IH 10 (E) to FM 1405, is a 8.8 mile section of the highway that was opened to traffic on March 25, 2008. Phase 2 of Segment I-2 (FM 1405 to SH 146) is currently under design.

Other segments are in various stages of project development. For detailed segment information, please click on the segment's tab to the left.