The stretch of Interstate 5 through Tacoma is one of the Pacific Northwest's biggest traffic nightmares. KUOW's Anna Boiko-Weyrauch explores why it's been so bad, for so long. We also hear about a Washington case that will go before the U.S. Supreme Court. It's a long-running dispute between the state and 21 tribes about hurdles for spawning salmon. As Eilís O'Neill of Earthfix reports, the outcome could have repercussions across the West and Midwest. And OPB political analyst Bill Lunch and senior political reporter Jeff Mapes dig into the week in regional politics, including an ambitious plan to fix Portland's infrastructure, the legal challenge to a proposed question on the next census form and an ethics settlement for former Gov. John Kitzhaber.