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I am a wildlife biologist working for the State of Washington.
Chehalis, WashingtonSign In to follow
According to Eschmeyer et al. (1983), there are about 50 species of snailfish along the Pacific Coast. Of these, only about 13 occur in nearshore waters (less than 600 fet deep). Most species vary in color, and with or without patterns. They are best identified by various technical features.
A few years ago during a survey for another species, I found a very similar gartersnake in a drainage pond created by a landslide just east of your sighting (and northeast of the quarry). At the time, I concluded it was an intergrade aquatic gartersnake. I will try to find the photo and post it.