All of the water in all of the ponds there is gross. At least it doesn't smell bad. What still shocks me is all of the people who fish in those ponds. Why on earth would you want to eat, much less touch, anything that comes from water that is drained from all the sewers and gutters in the neighborhood to the northeast of the park and then run through pumps into a cement pond?
The creek on 6 doesn't flow into the pond from the direction of the restrooms, it flows out of the pond and towards the restrooms... where it disappears into a secret Chud lair.