Same answer call tualatin hills parks and rec but would apply to the upper side ( south end ) only, where the playground is. Camp rivendale will be off limits to the public soon as they host kids camps all summer long. Lower part is controller by a new caterer and weekends are booking up for weddings. Im sorry I dont remember who the new company is this year.
Call Tualitin Hills Park & Rec & ask them because thrybare the ones that maintain the grounds. I am going to say I highly doubt it but it does not hurt to call and ask them.
Thanks! Your answer is awaiting moderation.