I've only been to Portland once, so no direct information. However, I've been looking at a number of YouTube videos of P4s flown in Portland. I just searched "phantom 4 portland" and got a bunch of results. That might give you some ideas.
This is probably the wrong thing to say, in your circumstances, but if you're new, I'd probably limit flights over water for a little while. (I know, lots of water in Portland.) Fixing a land-crashed P4 is sometimes possible. I've seen reports of more limited success at recovering water-crashed P4s. Just a thought.