The $7.5 billion Interstate Bridge Replacement Project’s two-decade old “Purpose and Need” statement is simply wrong, and provides an invalid basis for the project’s required Environmental Impact Statement.
Contrary to claims by project proponents, the “Purpose and Need” statement isn’t chiseled in stone, rather it is required to be evolve to reflect reality and better information. Yet IBR is relying on a 2005 purpose and need statement that rests on exaggerated traffic forecasts that have been proven wrong.
The IBR’s 2005 Purpose and Need Statement (still forms the basis for the 2024 SDEIS) claimed the I-5 needed to accommodate 1.7 percent more vehicles each year. In reality, traffic growth has been less than a fifth of that amount, 0.3 percent from 2005 to 2019.
For decades, highway builders have been pushing a “predict and provide” paradigm, pretending that we needed to plan for an ever-increasing flood of vehicle traffic, and threatening gridlock if highways weren’t expanded. But these self-serving predictions have consistently proven wrong.
Law and policy require that the “Purpose and Need” statement be reasonable, and not drawn so narrowly as to exclude alternatives, and that the statement evolve over time as conditions change. But IBR is using, nearly unchanged, a two-decade old statement that falsely claims that I-5 must accommodate ever greater traffic.



