A white lined sphinx moth maybe? It's difficult to know without a picture
I just released a moth from my house in Colorado. What species is it? It had a huge wingspan, dark brown on it's dorsal side, and with black and white patterns with a little red on the ventral side. When resting, it resembled a right-angled triangle
Dear Rex Stutznegger,
I don't think I can help you with the moth...but your Q caught my eye, I lived twelve years in the forests on Mt. Baker in Washington State. And at a certain time every year, I would find a few HUGE moths plastered to my windows in the morning.
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When I asked the local folk, it turned out these were a species that lives only in Old Growth timber. I don't recall the right-triangle shape, however, so probably not the same moth...but my experience just as a possible hint that might be a lead for you.
Are you near Old Growth?