I finally got to see these construction-detour shields unmasked Friday, for OR 221 in West Salem. Ironically, this particular one is at a street junction that's permanently signed as the route to get to OR 221 on Wallace Rd -- you can just see a corner of the overhead for this in the upper left -- but that's the usual route to get on 221 from eastbound OR 22. The detour, though, is in place for westbound 22 traffic, as the project (a repaving, I think) forces closure of the ramp that directly connects to Wallace Rd and detours traffic to the next exit. There are a few of these cutout shields along the detour, but also some standard shields on rectangular signs. Anyway, here's what they look like:

I say again: if Oregon isn't gonna use the great old eagle shields, I wish they'd at least consider this cutout design, as these look pretty sharp. Alas, they only seem to be some contractor's vision of the OR route shield.
I actually looked around for any US 22 or US 221 sign goofs, and was mildly surprised there weren't any. That's been another common feature at many Oregon projects lately!