"What is the Troutdale area VFR altitude restriction?"
They are very careful not to let VFR traffic go up into the final approach path of PDX. The ATC can set the altitude restrictions according to the flow, it's in the AF/D. "Portland Intl arpt (PDX) Rwy 10L–28R extended centerline crosses arpt, twr may issue restrictions due to PDX tfc."
When I flew out of there, you had to turn before the lakes to the west, right or left, and stay low until you were out of the airspace. It's an interesting airport with a high bluff on the baseleg to 25, heavy Columbia River gorge winds and that airspace to contend with.