We were a little concerned from having read previous reviews about how close together the sites in the cable/wi-fi section would be. But we found them quite reasonable and the site we were assigned close to the edge of the park had lots of open space around it. We did see sites though in other sections of the park that were simply drawn off on an asphalt area and the RV's there were very close. There was a great view of Mount Adams. Good value.
Very friendly and hard-working staff and a well maintained KOA. The day we were there was very windy and the campground staff was out picking up fallen branches and twigs from the trees. Well watered and grassy campground with good space between sites. We found it very comfortable. There were only about 20 sites taken when we were there, which was fine with us but not good for the campground. As we drove by we noticed the other RV park in Arco was much busier.
Agree with earlier reviewers, this is a very poor campground in terms of facilities and cost. Had to wait to check-in because the person who handled that was in the back room watching TV. Sites were marked by rotting logs on the ground. The campground is in three sections, two of which are accessible directly from the highway and provide no security. There were very few campers in the park the night we stayed, and it appeared that about half of those were long-term, perhaps workers on the highway construction taking place a few miles away. The rate listed was with a AAA discount.
The campsites back to the end of an arm of the lake, which was more like a swamp than open water. The mosquitos were awful. There are two water faucets in the campground- only one of which is close enough to the road to use to fill an RV water tank. Not as well maintained as another SRA we stayed at that was closer to the state capital. Apart from these things it was a decent enough campground.