Atigun Pass is the highest pass in Alaska. It is located on the Dalton Highway aka the Haul Road. The Dalton is 75% gravel and the pass is entirely gravel according to “The Milepost”. I have driven it in a vehicle, but never ridden it. It is tentatively on our list for this summer (2021). The Milepost calls the Haul Road the most remote and dangerous road in Alaska. Atigun Pass is 325 miles from Fairbanks, 684 miles from Anchorage, 904 miles from Homer Alaska, and 1021 road miles from Skagway Alaska. So yes, it is remote.
Atigun Pass is on the Continental Divide in the Brooks Range separating the North Slope (Artic Ocean drainage) from the Pacific drainage. (As an interesting side note, the North Slope only receives about 5 inches of precipitation per year, about half what Phoenix receives. But don’t expect nice weather or easy walking across the tundra. The permafrost keeps water from soaking into the ground causing swampy conditions and the tussocks make walking almost impossible.)
The Haul Road was originally constructed to haul material for the building of the Alaska Pipeline. Now it is used to haul supplies to the oil fields located on the Arctic Ocean, so you will see some semi truck traffic on the road. Given that, my vote for most remote climb in North America might go to Keno Dome in the Yukon Territory, but I could go either way.