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k6ncx's avatar
k6ncx
Explorer
Jun 22, 2016

Iron Mountain Road - Route 16A in Custer State Park SD

On an upcoming trip we will pass by this area and would like to drive through. I've driven through there (WB) 30 years ago (and in a Tradesman van) but this would be EB in a Coachmen Santara 302SA...
Roads and Routes
k6ncx's avatar
k6ncx
Explorer
Jun 22, 2016
Two different official (State of South Dakota) sources list the tunnels thus:

Tunnel 1, 14' 0" wide by 12' 9" high (has bypass);
Tunnel 2, 13' 2" wide by 12' 2" high (has bypass);
Tunnel 3, 13' 4" wide by 12' 4" high.

Our rig is 11' at highest, which I'm calling 11'6" because, well, I'd hate to do without air conditioning. MH, not TT. No toad.

Somewhere I rea that direction of travel matters, because outside of tunnels there are overhangs on one side. But I forget which side.

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