Giant letters on the entrance sign "The Mudhole" should have clued us in. While we found no mud, the insect life In rare form on a 90 degree, windless day. This 20 space campground is tucked under tall pines between Hwy 2 and the train tracks on the north shore on the Pon D'Oreilles River. Road noise is significant, likely from logging trucks at night. We didn't hear any trains though. Maybe the incessant high-pitched buzz of mosquitoes was enough to cancel it out. The facility has a decent swimming beach, picnic shelter and camping area for bikers. It's clean, well-maintained and has good hot showers (25 cents for 5 min).
Perhaps at other times of the year this would be a viable option. We visited in late July and there were plenty of open spots late in the afternoon. #12 is right by the river, and there's even a small dock and slip for two boats.
I'll post photos later!