Natural wet slide in Haffner Creek

Observed size 2-2.5 wet avalanche debris just up creek from the Hoar Cave in Haffner creek. It looks like it was initiated by warming on a rock band, and then completely scoured the slope to ground, entraining a large amount of vegetation. Debris stopped in a deep pile in the creek. Observation was from a distance, so I don't have specifics on dimensions and depth. Calling it a 2.5 because the path was >100m, and the debris pile could bury a van due to the terrain trap nature of the creek.