Narrative:

Aircraft X and aircraft Y both had to be kept high and vectored away from unknown VFR traffic (aircraft Z; reported via ads-B). I attempted to transmit in the blind to aircraft Z; however; I received no response. The VFR traffic crossed the outer fixes of both the 28R/28L localizer at pdx at 2;700; unverified. The presence of this VFR traffic caused 2 aircraft to be kept high and vectored around during critical phase of flight while descending on approach to pdx.the class charlie airspace needs extensions to protect the final approach courses. The fact that VFR aircraft are legal to cross through localizers at conflicting altitudes without being in radio communication with ATC is dangerous. An extension [protecting] the localizer out to the outer marker; surface to 5;000; 3 miles lateral on either side would greatly improve safety.

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Original NASA ASRS Text

Title: P80 Controller reported vectoring off course and delaying descent clearance for two aircraft on approach due to an unidentified VFR aircraft conflicting in the vicinity of the Initial Approach Fix.

Narrative: Aircraft X and Aircraft Y both had to be kept high and vectored away from unknown VFR traffic (Aircraft Z; reported via ADS-B). I attempted to transmit in the blind to Aircraft Z; however; I received no response. The VFR traffic crossed the outer fixes of both the 28R/28L localizer at PDX at 2;700; unverified. The presence of this VFR traffic caused 2 aircraft to be kept high and vectored around during critical phase of flight while descending on approach to PDX.The Class Charlie airspace needs extensions to protect the final approach courses. The fact that VFR aircraft are legal to cross through localizers at conflicting altitudes without being in radio communication with ATC is dangerous. An extension [protecting] the localizer out to the outer marker; surface to 5;000; 3 miles lateral on either side would greatly improve safety.

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.