We stayed at the Creel KOA in 1999 - a very nice campground that we mostly had to ourselves. There may have been 2 or 3 other sites occupied in mid-April - but at that time many visiting Americans and Canadians had already left for home. There were Kamping Kabins, full hook-ups, a store, a small bar/restaurant, and a laundry room. The flatbed RV train from Los Mochis had either stopped hauling RVs or was in the process of ending the RV trips and road access from the west coast was not for everyone.
A few years later the KOA was up for sale and I assume didn't succeed. The Creel KOA was expensive to stay at and was probably financially ruinous for the owners.