The Tyee Club of B.C. Has pulled 700+ tires out of the estuary of the Campbell River to date, and we are not even half way done. When we hit 900, I calculated, that stacked flat, they would be taller than the highest tower of the Golden Gate Bridge.
Where are they from? They were all nailed to docks, and used as fenders, bumpers, etc. When the nails rusted off, another was nailed on. The tires don't float away, they sink straight down and cover the bottom. We have seen 6 stacked in a pile, all falling from the same place, on the same dock over the past 50+ years. Yes, they do break down. The chemicals and bits get into the food chain.
The CR Estuary has been treated no different than any other estuary used for industrial use (log sort, shipping, float planes, pleasure craft, etc) on the BC coast. Every dock used to use tires, and most are on the bottom. The estuaries of the Puntledge, Nanaimo, Cowichan, Stamp and any other you can name will be the same. Every back bay where logging camps were present will be similar. In past years, it was just how it was done. Cut the tire and nail it on. Cheap and effective.
How many are on the bottom at the mouth of the Fraser? How many docks still use em?