I did not stay here, but stopped as it was the only dump site for many miles.  The campground is very clean and right on the west edge of Sisters, Oregon.  Very good location, right near the highway, but easy walking into all the fine shops in Sisters.

The host said that due to abuses in the past, they do not allow or sell any fresh water fill ups, but do have a very nice dump station with a hose connect for non-potable water to flush your black water tank.  I've added pictures that should provide a good overview.