mev

Looks like some fun places to visit. Note that you might need an additional qualifier or two than "highest unpaved road" for Mosquito Pass. For example, this mountain biking site has at least a trail listed slightly higher: http://cyclepass.com/t_tpa_co_MTB_alt.html and you need to exclude roads that go only one-way. For example, I remember an unpaved road most all the way up Mount Bross: http://www.dirtopia.com/wiki/Mount_Bross

In any case, you'll find a bunch of interesting roads and trails in the Colorado Rockies for both paved and unpaved cycling.