If all you want is fire that is all you need, all Multnomah County districts are dispatched right there. I don't scan any conventional for Multnomah County but they have a couple talkaround channels that are very rarely used when trunk system coverage is bad.
If you really want more you could add airport fire to your list but even those calls usually require a city apparatus or medic unit. If you hear a call dispatched and they say "respond on AB fire" that is the airport fire channel.
If you are traveling the freeways often there is an ODOT COMET region 1 channel, they respond to any incident on the freeways. If something is slowing down traffic they will be talking about it.
When I first moved back here a couple months ago I had a hard time believing that was it but they really don't have s high call load and they are smart about how many of who they send to what so they cut down on unnecessary apparatus going on commercial fire alarms which cuts down on radio traffic.
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