One 'trick' of Reserve America is to not only try to reserve for a specific data, but look at the Date Range Availability Tab. There you can see such things as that at the Amphitheater Campground in Ouray - that 5 of the 17 'RV accessible' sites are Walk-in - no reservations taken for those sites.
Looking at the general area map and moving in shows the Thistledown Campground does not take reservations. Nor do South Mineral, Sunshine, Priest Lake, Alta Lake, etc.
Also my research shows seven campgrounds with electricity at some sites in the triangle - Ouray, Durango, Cortez.
