We stayed there during the Sturgis Rally and have done so for the last 5 years. We camped there in a 42 foot RV and use 50 amp service. They have the best price during the Rally anywhere close to Sturgis. They have just added new sites all with 50 amp service. The owners checked on us at least 3 time during our 8 day stay. The owner are very nice people. This is what I would call a mom and pop campground. It has two showers stalls for the men but I never had to wait on one. We camped here in a Fifth Wheel.
The owners were friendly and accommodating. However, the RV park was "unkempt" and dirty looking. The grounds were not mowed with grass and weeds growing. Gravel drive and campsites. There seemed to be a lot of permanent residents in older trailers. Just not a place I would care to return to. I was there one night. We camped here in a Travel Trailer.
Centennial Campground is a nice little park, conveniently located on a frontage road right off I-90. The staff/owner couple were very helpful. For example, when I asked if they knew where we could drop off the recycling we'd been collecting for several days, the lady owner went above and beyond by calling around town to try to find us a drop off center. And the man owner came out to help us level our RV. Very friendly owners, super nice. The campground itself is a big, grassy, flat field. Very pretty. There are a few full timers here but it was 90% empty when we were here. We were the only non-full timers when we stayed. The laundry is fine and was clean; 3 washers for $1.25 each and $1 for 50 minutes for the dryers. What I especially love is the way the owners have an honor system for using their laundry supplies. There is a little cup and they ask you to pay "20 cents for a cup full of detergent, 10 cents for a dryer sheet" etc. Just very home town and thoughtful. The bathrooms and showers are clean, maybe a bit old style but the owners add paper towels and nice smelling soaps to make it nice. This is a no-frills type place but very reasonably priced at $24 when we stayed. They don't take Good Sam at such a low price, I can't blame them. We stayed 2 nights while hiking nearby parks. We camped here in a Motorhome.