Colorado BLM land you can camp on for free for up to 14 days. They have bathrooms but little else, but they are very nice with grills and fire pits. I cannot emphasize this enough to visitors, we have bears, very large cougars, and rattlesnakes so please come with a handgun no smaller then a .357mag, or and a long gun, shotgun with slugs or semi auto large caliber rifle.
Open carry (No Permit Required) is legal in Colorado so don't be afraid to wear your pistol on your hip, just don't conceal it unless you have a permit.
Water is super high and fast right now but coming down quickly, in 2-3 weeks it will be time to hit the claims, if your going to be in that area at that time, you can join us on our private claims not far from there.
I would stay clear of the Animas River, I was down there two weeks ago and it was still yellow from the EPA spill.