I-5 Tunnel?

Tunnel Roadway Profile and Upstream Alignment chart

The I-5 bridge between Portland, Oregon and Vancouver, Washington is an antique. They've been talking about replacing since forever, but all the talk has gotten nowhere. Maybe we should consider a tunnel. At the least.

Willamette Week has a few words to say on the subject:

Shouldn’t We Be Talking About Constructing a Tunnel Under the Columbia River?

Clark County Today posted a story three years ago:

Is a tunnel actually viable for crossing the Columbia River?

Previous post about the bridge.

Early photos of the river and bridge.

My hare-brained idea for a bridge.