Is there a sign at the gate saying ATVs are allowed to go past, is there a narrow side-gate to allow ATVs, or are some ATVers just going past the closed gate?
If you want to look into it, that gate and area are managed by the Ogden Ranger District of the Uinta-Wasatch-Cache National Forest.
Ogden Ranger District
507 25th Street
Ogden, UT 84401
(801) 625-5112
There is a spot right behind Willard peak that keeps snow for a while under the big trees that the road goes through. I am sure they don't want anyone tearing things up and getting stuck. As far as ATVs go, usually they care about gates and find a way around them