$24.5B Plan To Convert U.S. 287 To Full Interstate Is Feasible

Texas Study: $24.5B Plan To Convert U.S. 287 To Full Interstate Is Feasible

J Galt | Dec 4, 2025

Texas transportation officials have concluded that upgrading U.S. 287 into a full interstate highway from Port Arthur on the Gulf Coast to Amarillo in the Panhandle is economically feasible, even though the project would carry a price tag of roughly $24.5 billion.

A feasibility study quietly released by the Texas Department of Transportation found that converting the 671-mile diagonal corridor to interstate standards would create more than 46,000 jobs and add $11.6 billion to the state’s gross domestic product by 2050.

U.S. highways and Interstate highways both carry the “U.S.” shield, but they belong to different systems and follow different design rules. Any major road funded primarily by the federal government and designated as a U.S. numbered route is a U.S. highway; these can be two-lane roads, have traffic lights, at-grade intersections, or driveways.

Interstate highways, by contrast, are a specific subset of the U.S. highway system that must meet strict federal standards for controlled access (no driveways or traffic signals), minimum lane widths, shoulder widths, design speeds (typically 70 mph in rural areas), and bridge clearances.

In short, every Interstate is a U.S. highway, but the vast majority of U.S. highways are not Interstates.

The U.S. 287 route already links two strategic military ports in Beaumont and Port Arthur with the Dallas-Fort Worth metroplex and the High Plains. Of the total length, 632 miles are not currently built to interstate standards and would require major upgrades, including replacing dozens of bridges more than 50 years old.

The study estimates that drivers would save an average of 44 minutes on end-to-end trips and that the new Interstate would divert traffic from congested sections of I-10, I-20, and I-45.

The report concluded that converting U.S. 287 to an interstate would bring economic prosperity and long-term growth to the cities, counties, and communities along the route as well as the entire state.

Despite the projected $39.6 billion long-term economic return, no dedicated state or federal funding currently exists for the project. Turning the highway into an interstate would first require congressional designation, and any construction dollars would have to compete with other Texas road needs.

TxDOT officials have not set a firm timeline but have suggested that work, if approved and funded, could be completed around 2050.