The pacific northwest is a prime setting for floating paper boats in the rain. Make sure you're wearing your rain coat, drop the boat in the water up the hill and follow it down. Until it disappears. Take it Georgie, take it.
IT is right where you think it is.
Please make sure the cache is secured close before replacing as you found it. BYOP. Good Luck! This can be accessible as a quick PNG or on foot.
Beware of all the friendly, helpful muggles in the area.