The flood control is a local issue to be sure but the longevity of this proposal is about I-5. A more accurate way to describe it that it is about Puget Sound and what happens when food and similar things cannot use I-5 for 5 to 10 days.

Somewhere way back I was around a discussion on raising I-5 and it is way more difficult than one would think. The thing I recall that stuck was the bridges upgrade, material cost, small stream drainage in the area, and the cost as now adays the permitting process described was way past awesome.