P80 TRACON controller reported the pdx class C airspace compromises separation for arrivals and depa...

Narrative:

I was working final on a runway 10 flow into portland. A regional jet was descending via the timbers arrival STAR and level at 5000. I noticed a VFR target squawking 1200 eastbound at 4700. The aircraft preceded to cross the timbers STAR. I issued traffic to the crj and the aircraft never got the 1200 target in sight. I had to turn and issue an expedited descent to the crj to avoid merging the targets. The unidentified aircraft continued eastbound; just south of kpdx and I handed the target off to the hood sector. Hood stopped all pdx departures at 4000 as the target continued to fly up the departure corridor at a slow rate of speed. This was not a safe operation. In no way whatsoever. Our class charlie airspace is completely at fault. The aircraft technically didn't deviate protected airspace. However; our arrival routes are not protected by the class charlie rules. The timbers arrival descends to 5000 feet and often we can't go lower because of terrain and arrivals/departures off of khio airport. The final sector's airspace needs to be protected at the standard downwind/base/final approach altitudes.every day there are targets crossing final in front of aircraft; below aircraft; and above aircraft and we aren't talking to those airplanes and have no way to verify their mode C. It is extremely unsafe; and unfortunately; something will happen someday that we all are desperately trying to avoid. This needs to be fixed soon; like yesterday.

Original NASA ASRS Text

Title: P80 TRACON Controller reported the PDX class C airspace compromises separation for arrivals and departures due to non-participating air traffic in the area.

Narrative: I was working final on a runway 10 flow into Portland. A Regional Jet was descending via the timbers arrival STAR and level at 5000. I noticed a VFR target squawking 1200 eastbound at 4700. The aircraft preceded to cross the timbers STAR. I issued traffic to the CRJ and the aircraft never got the 1200 target in sight. I had to turn and issue an expedited descent to the CRJ to avoid merging the targets. The unidentified aircraft continued eastbound; just south of KPDX and I handed the target off to the hood sector. Hood stopped all PDX departures at 4000 as the target continued to fly up the departure corridor at a slow rate of speed. This was not a safe operation. In no way whatsoever. Our class Charlie airspace is completely at fault. The aircraft technically didn't deviate protected airspace. However; our arrival routes are not protected by the class Charlie rules. The timbers arrival descends to 5000 feet and often we can't go lower because of terrain and arrivals/departures off of KHIO airport. The final sector's airspace needs to be protected at the standard downwind/base/final approach altitudes.Every day there are targets crossing final in front of aircraft; below aircraft; and above aircraft and we aren't talking to those airplanes and have no way to verify their mode C. It is extremely unsafe; and unfortunately; something will happen someday that we all are desperately trying to avoid. This needs to be fixed soon; like yesterday.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1502090
Time
Date	201712
Local Time Of Day	1801-2400
Place
Locale Reference	P80.TRACON
State Reference	OR
Aircraft 1
Make Model Name	Bombardier/Canadair Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR TMBRS TWO
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Route In Use	None
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 1
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

P80 TRACON controller reported the pdx class C airspace compromises separation for arrivals and departures due to non-participating air traffic in the area.