Our local lake has a yearly or every other year, lake cleanup day. Even worse for our lake, we have a highway and an interstate that cross it, another highway that crosses a major feeder Creek.
In four hours of cleanup, with four boats and 2-3 people in each boat, and others walking the bank, we'll easily fill a big dumpster. That's only covering half the lake.
Last year I found a bong, along the interstate.
The black eye for the local Fisherman - out of all the volunteers, only one is dedicated too fishing. The others are mainly duck hunters.
All of the parking spots in the park have trash cans by them. Which means you walk by a trash can to go fishing. Yet, people leave their trash where they where sitting.
Years ago I was stationed in Germany. The only time you saw trash along the roads, was when you were getting close to an American base.