Just spoke to the manager of the waste management facility. I picked up a LOT of trash at the Northern Reaches yesterday afternoon, enough to fill a 45-gallon bag. Some of it was close enough to the water to end up there. Sadly, a lot of the area fisherfolk have contributed to this travesty, as I found a lot of tangled line, empty lure boxes, and a lot of other things that might or might not be related to fishing, like empty refreshment bottles.
Nonetheless, I am thankful for the city's help in getting rid of this trash that I collected. I still have more, but I'll wait for the grass to die down in the colder weather for the rest of it.
Thanks for your help, Ian!