On the road Maps sent me down there were no signs that campgrounds existed, and the first one was closed, which gave me a little fright. The second, Acorn was open, so all is well. Army Corp campgrounds all seem to rely on having a person at a check-in gate. The gate wasn't manned so camping was free.

Allstays calls this Indian Memorial, an ACE campground. The signage is in the standard ACE font and color, and it just has the distinctive well-engineered style, so I am calling it ACE also. If so, then clearly it has been leased back to the tribe. It's on the edge of the Standing Rock Sioux Reservation. Nice place!

Keyhole State Park covers quite an extensive corner of the Keyhole Reservoir, and there are 6-ish separate campgrounds. The main road is paved, but the campground roads are gravel, leading me to deduce that the bigger the loop, the more gravel dust will cover you as the diesel trucks go round and round. So I am at Arch Rock Campground, the first loop and one of the smallest. Also, no boat ramp means fewer trucks.