What is Alternative F?

Alternative F features an underground tunnel that avoids most of the landslide complex. It is anticipated that such a tunnel would provide a more reliable route compared to the existing highway. The proposed tunnel would be approximately one mile in length with one lane in each travel direction. The tunnel would have eight-foot shoulders and a separated bike/pedestrian facility. To support ongoing maintenance needs, Alternative F would also include an Operations and Maintenance Center.

Alternative F would include:

• Major realignment to the east;
• Approximately 1-mile underground tunnel; and
• Operations and Maintenance Center.

While the tunnel alternative would cost more than Alternative X, its cost was approximately the same as all other alternatives analyzed during the 2021 Alternatives Analysis Workshops. The anticipated time to construct Alternative F is approximately 6-8 years and the current estimated cost to construct is $2.7 billion (in year 2026 dollars).

On the map, the alternative is denoted with a letter. The red line indicates the current LCG alignment and the dark pink segment with yellow border indicates the approximate position of the tunnel.

Please note the following:

• The lines on the map are approximate and do not indicate the exact placement of the alternative.
• Costs are estimated and include construction, materials disposal, and mitigation.

Click here to see the alternatives that have been eliminated from further study.

Click here to see a press release about the selection of Alternative F as the preferred alternative..