robin_foster1•2mo agoProlific Poster

I finally saw the erosion at the base of the cliffs near Cannon Beach

The undercut is way worse than the last photos I saw from 2020. Anyone know if the state park has a current hazard map for that section?

3 comments

3 Comments

piper_wells652mo ago

Check the park's main website, not just the page for that area. They sometimes post new survey maps as PDFs in the news section. Skylerc86 is right that the official maps lag, so also look at the USGS landslide hazards website, it has more current data layers. I was just there and the fence line has been moved back another twenty feet since spring. Don't trust the old trail markers at all. The undercut is active along that whole stretch now.

juliaa251mo ago

Wait, that's not totally right about the Cape Kiwanda slide. I live nearby and that one actually took a couple days to fully go. They saw cracks forming in the morning, by afternoon a chunk the size of a car dropped, then the rest went overnight. Different kind of erosion there too, it's sandstone cliffs not the riverbank undercut we're dealing with here. Point stands though, these slides can be sneaky fast. You really gotta check the USGS site every few weeks, not just once. I saw a new data layer for the north end last month that the park still hasn't updated.

skylerc862mo ago

Remember that big slide at Cape Kiwanda a few years back? Whole chunk just gone overnight. Makes you wonder if they even know how fast it's moving. I'd check the park site but those maps are always out of date. Heard they closed more of the trail up north too.