SH 99 Grand Parkway segment B - I-45 South to SH 288
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SH 99 Grand Parkway segment B - I-45 South to SH 288

Segment B is an environmentally approved (not yet constructed) 28-mile, four-lane, controlled access toll road with intermittent frontage roads from I-45 South (the Gulf Freeway) in League City toward SH 35 in Alvin and on to SH 288 (the South Freeway) near Rosharon through Galveston and Brazoria counties.

On February 7, 2023, TxDOT executed Toll Project Agreements with Brazoria County and Galveston County respectively, that provide for TxDOT to develop, finance, construct and operate a portion of Segment B, known as B-1 from I-45 to south of FM 2403.

In January 2024, the Texas Transportation Commission assigned the rights to develop, finance, construct, and operate the portion known as B1 to the Grand Parkway Transportation Corporation (GTPC) and on February 27, 2024, the GPTC Board accepted B1 into the GPTC System.

The map below shows Segment B 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.

TxDOT, on behalf of GPTC, is performing a reevaluation of the portion known as B1 to address some proposed design changes. Information on this reevaluation can be found on

The latest approved environmental document for Segment B is the Record of Decision, which was issued Nov. 30, 2016.

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

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