Can't keep my iguana?

Okay. i am 15, and have had this beautiful iguana for about 4 or 5 years. i love him (his name is Aqua). Due to reasons, I cannot keep him. I would like to give him to a great owner, and i was hoping hte Oregon (portland) Zoo would take him. i tried calling them, but a computerized voice tells me to go to the website. i have gone there, and found nothing of help. If you could find me a phone number for the zoo, or any information that could help me, i would be most greatfull.