In Spring, there's lots of pollen produced in the nearby forest. Some of the heavy producers are alder, fir, pine, and hemlock.
Powell Lake is soon covered in a bright yellow scum. At first glance it looks like a mess, but on second thought ....
The the rocky shoreline gets a bright yellow ring along the high water mark.
It'll take a lot of scrubbing to get rid of that ring around the tub. Mother Nature better get out her biggest scrub brush. -- Margy