I have many memories of the Brrrr River campground. Some good, some real bad.
It used to be good for fine gold, when the Quarry was working upstream, and would regularly release gold into the river downstream. Now, that's shut down. And a lot less gold. Its so overworked now, especially at Iwo Jima Beach at the lower end of the CG. Nothing but bomb craters left. There is a gold line going down the middle of the river, if you can find it, and dig into the gooey clay muck that traps the gold. But you better have a wet suit on, the water is Brrrr COLD! The crud slime gets all over the rocks some years, and ruins sniping, a type of horrid algae that looks like toilet paper. And don't drink the tap water at the CG, a friend of mine got a bad case of Giardia cyst there one year. Boil or filter it.
An old cowboy wandered into my camp site one evening, and told me this was to be his last roundup. Yup, the next morning the ambulance hauled his carcass out! Needless to say, it put a buzz kill on my trip, as I was afraid he would take me with him!
Dopers often take over the CG, and back in '91 a guy used to have a drug route down there twice a day! That's why they took out the pay phones there, years ago. Other times the Latinos take over part of the CG, in swarm, and that happens in the CG's of the N. Fork Yuba as well. But mostly, folks won't bother you and there are decent folks that go there.
Downstream at Dog Bar crossing, they take out nice gold, but parking is so limited there, and there is a motley crew there I would rather not be around. That area has bad JuJU, in my book.
If you sluice at the Iwo Jima Beach, about all you can expect is fly poop, maybe a dwt. for six hours work. Not good at all.
Back in the day, I saw folks fill up a 2 oz. vial in just a weekend! And a dredger took out 7 oz. one day! But not at all anymore.