Using the Sun's light dancing through the trees and shrubs casting shadows I was able to track bees back to this nest. When you stand and look between trees and shades you'll start to notice a definite bee darting line. You can continue this method to eventually arrive at their nest.
This nest is located in a floodplain along the east bank of the Willamette River near Sellwood.
7 Sept 2021
Total reported by Alasdair is 13