A lonely outpost of Mendocino National Forest - a little chunk of federal land next to the diversion dam. The parking lots are huge, making it seem like it was full of action back when the dam was being used create the diversionary lake. Emptying the dam a couple of decades ago was sad for the boaters of Red Bluff, but great for the salmon, who were being killed off by the salmon ladder. This beautiful campground suffers from being too close to the town of Red Bluff. The bathroom has a security code to prevent random weirdos from moving in.
At the Rainbow Road exit off I-80. On the South Yuba River. Super nice place, even if the freeway is 200 yards away. If you're familiar with the Bay Area to Reno run on I-80, there's a place where it crosses some beautiful rapids. This is about ½ mile downstream from that.
In the harbor area. You can see it far below you from 101 in the east side of the bridge over the Noyes River. The "office" is the cashier on the second floor of Silver's at The Wharf across the parking lot. It's also great place to return to for a sunset beer. Very user-friendly place. Upstairs rooms are $10 cheaper, but they were full.
RV parking is way in the back of the parking lot ... That part of the lot is still gravel there and quite muddy in the rain. Casino is cozy and not unpleasant. Restaurant and bar are just fine. Wifi is terrible except close to the coffee shop.