These are all you'll need. A slightly more detailed description than what is in the database.
28944 TAPOUT
4528 OPS 1 - Limited Response (medical/car fires/fire alarms)
4560 OPS 2 - Structure Fires (Primary: Airport, Alt: Portland)
4592 OPS 3 - Structure Fires (Primary: Portland)
4624 OPS 4 - Structure Fires (Primary: Gresham, Alt: Corbett/Sauvies Island)
4656 OPS 5 - Structure Fires (Primary: Corbett/Sauvies Island, Alt: Gresham, Alt: River Rescues)
4688 OPS 6 - Tactical Rescues (Extrication, Rope Rescue, Typically anything requiring 3 or more responders (not including the ambulance)
4720 OPS 7 - Training, Alternate Structure Fire/Tactical Rescue channel
1520 OPS 8 - Training, Alternate Structure Fire/Tactical Rescue channel
1552 OPS 9 - Training, Alternate Structure Fire/Tactical Rescue channel
19184 OPS 10 - Training, Alternate Structure Fire/Tactical Rescue channel
19216 OPS 11 - Training, Alternate Structure Fire/Tactical Rescue channel
19248 OPS 12 - Sort of a "Car to car" channel, sees limited use now that 'PFB Talk' handles most of this traffic
4304 PFB TALK
During rare circumstances channels have temporarily been reserved for potential major events. Last time I remember an OPS channel being placed 'out of service' was on Dec 31, 1999. OPS 2 was placed in reserve in the event of a major crisis and would be utilized as a west-side OPS 1, OPS 1 would then become an east side channel. Theory being that in the case of a crisis, most of the tactical channels would already be in use and an unusually large volume of limited response calls would saturate radio traffic on OPS 1. But what difference would it make? Its the end of the world at that point, right?