So by now you should have picked up on the fact that Zumwalt Campground is a countercultural event that finds it’s roots in the hippie movement of the 1960’s. While at the Oregon Country Fair and ZCG you should expect that boundaries of social conventions will be challenged, including various states of undress. Swimming naked in the lake is a time honored tradition, but you should be aware that in Lane County, Oregon it is against the law.
what the law says
In the State of Oregon it is legal to be naked in public so long as you do so without "the intent of arousing the sexual desire of the person or another person." However, local jurisdictions can place more restrictions on public nudity. In Lane County, “No person, eight years of age or older, shall on public or private property, expose his or her genitals to another person.” The same holds true for the City of Veneta. So, by letter of the law as long as your genitals are covered and not engaged in sexual activity, you can wear or not wear what you like.
what really happens
As you might expect, there are frequently naked people near the lake. Occasionally there will be people who will be naked while they get dressed or undressed at their camps as they proceed through their day.
what you can expect
It is the responsibility of the hired security service to enforce the guidelines for the park. Nudity at the lakefront is a generally accepted practice and you should not be hassled by security. If you are, throw on a towel and go to registration and get that straightened out. The organizers of the event expect that campers not walk around with their genitals exposed, the rest is up to you. Top-free or bare chested for all life forms, including humans, is fully permitted. However, if you roll up to get a crepe and a latte in the full-on buff you will very likely be asked to put your junk away. Don’t get pissed off. Grab a fig leaf and pick up your order. Campers, the point here is to do your thing, try not to break the law too much, and consider the people around you before getting naked.