it's possible it was mapped when water levels were higher or lower
Places like this are not actually 1 foot but rather they did not map the area so they put it as 1 foot
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I fish there occasionally and I have never had any trespassing problems. There is a trail on the west side leading to the water. He also stores some stuff on the public property which is why he doesn't want people near it. I have never had any problems though. Did you see any fish coming up?
I know they sell folding kayaks. I've see some guy on YouTube who fishes out of one and he really likes it and he does well out of it. You might want to look into it.
if you go into Charles Daley park you should be able to dunk a worm into 15 or 16 and catch alot. under the north service road bridge in 15 mile creek there is loads of sunfish aswell. use a very small hook.