This sounds like the stuff that seems to pile up along the bottom every summer just below the confluence of the Sultan River and the Sky. The City's sewer outfall is located there as well and I hate to say it but the stuff lookes like old tolilet paper fibers...YUCK!

BD
_________________________
Bobber Down

"It makes no sense to regulate salmon habitat on land while allowing thousands of yards of gill nets to be stretched across salmon habitat in the water"

John Carlson, Gubernatorial Contender, Sept. 2000 speech at the Ballard Locks