A protestor was arrested Friday at Portland’s Mount Tabor.
Police say the man was putting up signs in violation of park rules.
Police asked him to leave, but 66-year-old Michael Meo refused.
Meo is part of a protest against water policies that call for draining Mount Tabor’s historic reservoirs.
City officials have said the group will not be allowed to stay overnight, and that a midnight curfew will be enforced.
Organizers with Occupy Mount Tabor say they intend to stay put. Meo was charged with Criminal Tresspass, and taken to the Multnomah County jail.