The tunnel options are discussed on pages 5-7 to 5-9 and 5-13 and 5-14 (PDF, 156K) of the screening report (PDF 3.3M).

The idea is to have a tunnel that goes underground somewhere before Marine Drive and surfaces around Mill Plain Blvd., bypassing Hayden Island.

Staff gives this a thumbs up a supplement to the existing bridge, but thumbs down as a replacement, on the basis that it doesn’t provide local access within the Bridge Influence Area (or provide transit or bike connections in the BIA for that matter).

From an auto-reliance point of view, I suspect it’s in the same league as the supplemental bridges.

Columbia River Crossing Tunnel

Read the Ground Rules for CRC Week.

ID	NAME	Q1	Q2	Q3	Q4	Q5	Q6	Overall
RC-13	Tunnel to Supplement I-5	P	P	P	P	P	P	P
RC-20	Replacement Tunnel	F	F	F	P	F	P	F

The tunnel options are discussed on pages 5-7 to 5-9 and 5-13 and 5-14 (PDF, 156K) of the screening report (PDF 3.3M).

The idea is to have a tunnel that goes underground somewhere before Marine Drive and surfaces around Mill Plain Blvd., bypassing Hayden Island.

Staff gives this a thumbs up a supplement to the existing bridge, but thumbs down as a replacement, on the basis that it doesn’t provide local access within the Bridge Influence Area (or provide transit or bike connections in the BIA for that matter).

From an auto-reliance point of view, I suspect it’s in the same league as the supplemental bridges.

Comments have been closed and will be submitted to the project public record. If you have additional thoughts, please comment on the open thread for this purpose.