See the latest and historic data about big game hunting statistics for different hunts.
myodfw.com
Start here and look at some of the harvest stats. The NW tag is always easy to draw, partly because success rates are relatively low. There's a fair number of bears in the NW coast range, but not near as many as SW or NE Oregon. And they can be hard to hunt because of the terrain, it's just so thick and bears are often down low in the drainages. You could be 25 yards away and still not able to see it for a clear shot.
Time in the field will be your main factor. Hike spur roads and closed/decommed roads if possible, finger ridges, river bottoms, and look for bear sign. Even if it's from last fall. See if you can look up more specifics on their diet, but in general, springtime they're looking for greenup. Grasses in clearcuts and along exposed road edges. Skunk cabbage. Things like that.
Even if you're focused on glassing open areas, I would really suggest scouting hard to find areas that actually have some bears using them. Bears leave a lot of sign behind, it's usually not too difficult to tell if they're in the general area or not.
Be advised that a lot of bears get culled on tree farms too.