There are a lot of water supply lakes that don't allow access to the water. Particularly when the water is not treated, they don't want it contaminated.
Just because they do doesn't make it right.
So your concept is to spends millions and millions of dollars, so that 50-100 canoeists can go out?
you wonder why there is a huge part of the electorate that just wants to shut public parks down altogether.
<shaking my head>
That is EXACTLY what I mean by "I want, what I want"
It means an attitude of doing things irrespective of consequences, particularly to others.
The bodies of water you describe are UPSTREAM of treatment.
SF water is hardly treated. You might read that article by Bob Rockwell that states that. It is treated not because it is not pure enough, it is treated because regulations were passed that required that ALL water be treated.
http://www.sfexaminer.com/local/2011/07/hetch-hetchy-water-goes-through-ultraviolet-rinseMaybe they could open it up for canoes, now. But then, people would be yelling that it was just a maneuver to keep the dam from being removed......
