Welcome Kevin,
ASMOF IMO there’s no way of knowing for certain.
A spring near the surface nearby does not necessarily mean a spring under the lake will be a positive. It’s actually just as likely to be a negative.
I would think for swimmers to feel flow under water it would have to be a heck of a spring & dredging should have uncovered it. Feeling cool water below the thermocline could possibly be mistaken for a spring.


Pond Boss Subscriber & Books Owner


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Ric