I think in general the seeing over a body of water would certainly be better than over hard surfaces. However if there is a mist or fog forming over the water in certain conditions that could really be a problem.
Some of the best seeing for planetary photography is due to large bodies of water producing laminar air flow, however it’s normally an ocean rather than a lake/river.
Best way to find out regarding a specific spot is to give it a go. Remember that things can be very different summer vs winter.
As a side note, a lake/estuary full of mozzies is absolutely zero fun.
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