If you blink, you'll miss the turnoff to Olallie on Hwy. 126. It's a tiny campground with 17 sites. Half right on the river and the others on a bluff overlooking the river. I spent 4 nights in a Sylvan Sport tent trailer. The sites are pretty small so better for smaller rigs. The McKenzie river is spectacular and runs through the Belknap lava flows which turn the water this amazing blue as well as crystal clear. There's so much to see and do in this area that you'll need to come back numerous times. The campground was super clean with a really nice host, but the "potable" water was very iffy. When I stayed there (May of 2021) the water was a gross yellow and the test results hadn't come back for it. Honestly I wouldn't have drank it no matter what the test results said!!! Not to mention it's a hand pump so if you're solo, bring a bucket. It's a workout and you need both arms to pump the thing. Definitely bring plenty of drinking water along. I used the well water for dish washing and I'm still alive......:) So with exception of the water, Olallie gets big, big thumbs up from me.