This is a bit late, but for other people who might read this thread: We have traveled thru Yosemite via highways 140 and 41, and on up over Tioga Pass on highway 120.
There are 4 tunnels in Yosemite. 3 on Big Oak Flat Road, 2 short ones and one about 1/3 mile long. The Wawona Tunnel on highway 41 is about 1 mile long. Be sure to stop on the valley side of the tunnel for a geat view. Watch for pedestrians, not watching for you.
All four of these tunnels are passsable. We measure 11'9".
But we did hug the center line!!
Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 36' FDS 72232 Our Photos
We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, me and you - hand in hand.