Yeah, that would be a tall tunnel. It was a concatenation of 16'11" and 16'9", the vertical clearance of the two bores.
It's corrected now - and I found a webcam of the east portal. I added a link in "Sources".
You should check the vertical clearance. It seems that a decimal point might have been moved. When I ran the figure through a calculator, I got a clearance of more than 305 miles!