The Overbudget Tunnel

The Sightline Institute, a local nonprofit researcher, has issued a report that finds digging a deep-bore tunnel under downtown would likely run far over budget, costing the average Seattle family of four $700 or more. The group examines other tunnels as indicators: the Mt Baker I-90 expansion tunnel, the downtown Seattle bus tunnel, Sound Transit's Beacon Hill tunnel, and the Brightwater sewage tunnels.