SH 99 Grand Parkway segment D - US 59 South to I-10 West

Segment D is an existing 17.4-mile, partially controlled access toll road from US 59 South (the Southwest Freeway) in Sugar Land north to I-10 West (the Katy Freeway) near Katy. This segment is complete and has been open to the public since Aug. 31, 1994. Mainlane overpasses from US 59 South to the Westpark Tollway were constructed by Fort Bend County and opened to traffic in April 2014.

Fort Bend County Toll Road Authority operates and maintains Segment D from US 59 South to south of Fry Road.

TxDOT operates and maintains the portion of Segment D from south of Fry Road to I-10 West.

The map below shows Segment D of the Grand Parkway. Each square indicates the limits of the detailed map of that portion of the segment. Select a link from the list below to view a detailed map of the segment. The detailed map will open in a separate window. The maps are large files and may be slow to download. Once in the detailed maps, use the zoom button in the toolbar to view the maps at 100 percent of their original size.

The latest approved environmental document for Segment D is the Categorical Exclusion, which was approved Nov. 17, 2009.

Below are some of the other latest-approved Segment D environmental documents:

• Re-evaluation of the Environmental Assessment

If you have questions about Segment D or would like to request any other environmental document, please email the Houston District.

Related studies - SH 99 from Highland Knolls/Bay Hill Boulevard to South Fry Road

TxDOT in coordination with Fort Bend County is developing preliminary plans to improve SH 99 from Highland Knolls/Bay Hill Boulevard to South Fry Road. The proposed project would add continuous two-lane frontage roads along sections of SH 99 between Highland Knolls/Bay Hill Boulevard and South Fry Road. A section of frontage road would be constructed along SH 99 northbound from South Fry Road to Highland Knolls/Bay Hill Boulevard.

TxDOT held a stakeholder meeting on June 30, 2023. Stakeholders included homeowners associations (HOAs) and Municipal Utilitiy Districts (MUDs). The meeting presented information on the SH 99 mainlanes, frontage roads and noise barriers. You can access the ameeting recording, presentation slides and fact sheet.