No, it won't evaporate, but it will never return to what it was before. You can't keep letting saltwater into a marsh that you want to try and revert back to fresh or brackish marsh.
As was pointed out once before, the weirs do have openings in them for the fish and other species to move in and out of the marsh. If the fish, crabs, and shrimp don't want to move, that's the fish's choice. Also as was pointed out, they still open the weirs at certain times to allow the shrimp and crabs to move.
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