Those old bridge pilings has shells near them in the sand:
How low was the Ocmulgee? Low enough that this boat put-in didn’t even reach a puddle that wasn’t connected to the stream:
Pictures of the Ocmulgee River on US 441 at the Telfair County Line
by John S. Quarterman, 18 September 2011.
There was also quite a bit of this invasive exotic plant:
Many birds, too.
-jsq
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