http://4.bp.blogspot.com/_oV8ecn5wrf...8+All+Data.jpg
It looks like the peak was later last summer, so the area's been declining for a bit more than 3-4 months. Prices look to be back to early-middle 2006 prices there after falling roughly 10% or so.
I don't see any evidence of a price bottom there, either in a return to the historical normal prices or in a decline in the rate of depreciation. Considering that sales are still decreasing year over year and inventory still going up, I'd say that they are just getting started with price declines. When inventory gets back in line with sales numbers, that's typically when prices begin to slow their decline and finally stabilize, but it looks like Portland isn't there yet.
Search in google for "Portland housing bubble" to see a blog with lots of data for the area.