N.M.
I don't know about the gresham area but if you can find a class I highly recommend getting your little one in a class. My son started at about 7 months - I wish we would have started earlier. They take to water so naturally, they've just arrived from a water environment! He is now 3 1/2 and has started his first classes without mom or dad in the water with him. He LOVES it.
Hope you find something, you will really enjoy it!