See the link for a KGW investigation into the poor response time to answer 911 calls in Portland. Don’t depend on your cell phone to bring in the calvary if you have an issue. Plus the police may or may not come depending if there are current shootings or violent protests both of which unfortunately are common in Portland.
Avoiding known problem bike routes
(Such as a lot of the springwater corridor)
Ride in groups when able
Don’t ride after dark (if possible) in problem locales.
Carry pepper spray in easy reach
Carry a handgun if you are licensed appropriately and have training.
I don’t want any more fellow cyclists to get attacked or be injured.