S. 4484: I–47 Future Interstate Act of 2026

This bill proposes to designate U.S. Route 287 as a new interstate highway, to be named Interstate 47 (I-47), stretching from the Gulf Coast in Texas to northern Montana.

Summary The "I-47 Future Interstate Act of 2026" (S. 4484) is a legislative proposal to expand the United States Interstate Highway System. It seeks to amend the Intermodal Surface Transportation Efficiency Act of 1991 to officially recognize the U.S. Route 287 corridor as a "high priority corridor" and formally designate it as Interstate Route I-47. The proposed route would run from Port Arthur, Texas, to Choteau, Montana.

Key Provisions

• High Priority Designation: Adds U.S. Route 287 to the list of high-priority corridors on the National Highway System.
• Defined Geography: Specifies the route's path starting at State Highway 87 in Port Arthur, Texas, and ending at U.S. Route 89 in Choteau, Montana.
• Official Numbering: Formally assigns the designation "Interstate Route I-47" to this corridor.
• Statutory Amendments: Modifies existing federal transportation law (the Intermodal Surface Transportation Efficiency Act of 1991) to include this new designation.

Impact Analysis

• Infrastructure Standards: By designating the route as a future interstate, the road will eventually be required to meet specific federal interstate design standards, which typically include controlled access (on and off-ramps rather than intersections), specific lane widths, and safety features.
• Federal Funding: Inclusion as a "High Priority Corridor" often makes a route more eligible for specific types of federal transportation funding and grants intended for major national infrastructure projects.
• Regional Connectivity: If fully realized, I-47 would create a major north-south arterial through the middle of the country, potentially easing traffic on other major interstates and improving the transport of goods from the Gulf of Mexico to the northern border states.
• Long-term Development: Designation is often the first step in a multi-decade process. Existing sections of U.S. 287 that do not currently meet interstate standards would require significant construction and investment from both state and federal sources to be officially signed as I-47.