Strange Caterpillar ID help

[Gord]

This guy was happily munching on goldenrod leaves. Any idea what species it is? I've never seen one like this before.

[Chris]

Gord, never have seen a caterpillar like that. Kind of curious to see what it is now.

[Gord]

Me too, no takers yet. Will have to send Stan and Denis an email as they're quite a bit more knowledgeable about butterflies and dragonflies. They may not have seen this posted here.

[Deleted]

This one's a puzzle. (Yes, I did see the post last week, but didn't have time to follow up on it.) This evening I went through James & Nunnallee's Life Histories of Cascadia Butterflies and looked at all the instars (stages) of the caterpillers of all species shown, but didn't see anything that looked to be a match. I checked several guides to see if I could track down any local species that use goldenrod as host plant, but found nothing helpful there. Wikipedia has a list of lepidoptera species that use goldenrod but none of them appear in Guppy & Shepard's definitive Butterflies of British Columbia.
Of course butterflies are a small minority of lepidoptera species, most of which are moths and are mostly much less well known and documented. I found some sites with illustrations of macro moths of the Pacific Northwest on the web, but nothing matched.
So I'm stumped, although I suspect it's probably a species of moth. I hope Denis has an answer.
Stan

[Gord]

Thanks for looking into it in such detail, Stan!

I will toss it in Denis's direction and see what he comes up with.

[Gord]

Bruce and Joanne emailed me a link which looks promising.

bugguide.net/node/view/7845/bgimage

The name of this one, which is very similar to the one pictured above, is Goldenrod Hooded Owlet (a moth as Stan suggested).

Thanks, guys!