Cedar tree white mold
Hello, I am not 100% sure what this fungus is, but we've had reports of similar signs this winter. We do not think this fungus is killing the tree or impacting tree health. If the crowns still look healthy, this is likely not something to worry about.
It is possible to get the fungus identified via the Oregon State Univ plant clinic. There is a fee. But here is the website. If you want this identified, I would call the plant clinic, or email a picture then call, and ask about how to collect a specimen so the can identify it. https://bpp.oregonstate.edu/plant-clinic
Since the tree is close to your house, you may want to have an arborist evaluate the tree.