Are you sure you're talking about Englemann Spruce here? I would never describe it as orange. The only Englemann spruce I've ever seen is white, almost colorless, maybe with the slightest cream color, indistinguishable from Sitka Spruce. Also, finding long clear boards that are 20+ feet in length would be unusual since these spruce tend to have lots of small pinhole knots. I am able to find clear spruce boards up to 16' here in Montana, but it's from a high volume sawmill. I doubt any individual tree produces more than a couple long clear boards from the north side of the bole. It is really low density wood, comparable to western red or northern white cedar I have bought over the years. The last few boards I bought were 19lb per cubic feet. I'd check the density on the wood to confirm. Idaho has lots of Ponderosa Pine and Doug Fir, which I would describe as being orange in appearance. Idaho and western Montana also have Western larch, also known as Tamarack. This species is a bit heavy, but one could get 20+ foot boards from them.
Mark