Water was one of the substances of Arda with the lowest concentration of "Morgoth-element", was it not? Perhaps the spiritual corruption of the Morgulduin (I always saw it as a "magical" evil rather than, say, the physical pollution from the New Mill) was too dilute by the time it reached the Anduin proper.
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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