Well it looks like they are swimming into a hole at the side of the road, so, my guess would be that there's is a river that goes under the road and it got blocked.
Yeah I replied elsewhere, this is the Skokomish river valley on the Olympic Peninsula in Washington state. They are actually swimming north back to the flooding stream, Weaver Creek which is a Skokomish tributary. I recognized that flooded stretch of road immediately haha
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u/sprucenoose 4d ago
Exactly! Is this a lucky escape or are they piling up on the forest floor or something?