|Quoting NathanR (Reply 3):|
When I said I live somewhat close to PDX I mean the airport. I live in north east. Sorry about the confusion.
They are the planes that are coming in on final for Rwy 3 I believe.
When I've tried to fly in to PDX, the tower has never let me use 3 or 21, they make you use the 10's or the 28's to fit in with the flow. And then, it's almost always 10L or 28R (since you're going into Flight Craft anyways, it speeds things up to put you on the correct side of the airport
). I suppose I might be able to use the crosswind runway one of these days, I'll just need to come in sometime when the traffic is really light.
I checked the instrument approaches, and RWY 3 has none (the other end, 21 does...). However, the runway has a 3 degee PAPI (Precision Approach Path Indicator), which you, as a pilot, cannot legally descend below the "on glideslope" indication on. Traffic landing on 3 is most likely the "low" traffic that you are seing.
If you are cutting through Portland's Class C airspace (i.e. going through it, not landing or taking off at PDX), the controllers will usually vector you directly over the airport at 1500 feet, which puts you, counterintuitively, in nobody else's way
This may explain the "high" traffic that you are seeing.