Is there an accessible shower with bench seat available
I imagine the hotel has such rooms, but as noted by others, it's best to contact the hotel directly.
I did not have that style of shower in my room, however, maybe there is an option in another room. Just give the hotel a call! =)
It has been upgraded recently by the appearance of the building, so I would be surprised if they did not offer accessible showers. I would contact the property directly if they don't show on their website.
Get an answer from Crowne Plaza Portland-Downtown Convention Center staff and past guests.