I've now reported this on pdxreporter.org which I think is more actively monitored. I got this response:

Thank you for contacting the Pothole Hotline 823-BUMP (2867).

The Hotline is checked daily. Upon receiving a report, a staff member determines that the street is in fact a Portland-maintained street. It would be a violation of City policy for the program to repair a pothole on a non-maintained street or a street that is the responsibility of another city, the County, or the State.
Pothole repair crews are given their lists each morning and work their way around the city in assigned geographic areas. Crews aim to investigate every pothole on city maintained streets within 48 hours of being notified, although weather, emergencies, and other work demands can sometimes require response times longer than 48 hours.
If weather or other conditions prohibit a permanent thermal patch repair, a cold patch repairs the immediate hazard and crews follow up the emergency repairs with permanent repairs during warmer and drier periods.
To report a pothole in other jurisdictions outside the city of Portland, use the following numbers:
Clackamas County - 503-650-3262
Multnomah County - 503-988-5050
Washington County - 503-846-7623
Beaverton - 503-526-3709
Gresham - 503-618-2525
Lake Oswego - 503-635-0280
Milwaukie - 503-786-7600
ODOT Freeways - 503-283-5859