I got this email from Judy and Roland de Szoeke:
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Hi Don and Lisa,
Can you help us ID the creature in the attached photo? It was taken
on the Vineyard Mountain trail about halfway up near a trail junction by
a huge old Doug Fir.
It is animate, because it moved when Roland poked it. The visible
portion is about a foot long but the lower end was still underground.
Is it just a giant earthworm? iNaturalist was not much help!
Judy de Szoeke
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I don't much about giant earthworms but I shared with them this thread from March 2019, when Catherine Otto posted some photos from Peavy Arboretum
-Don Boucher