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In page Erie Canal:

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Construction continued at an increased rate as new workers arrived. When the canal reached Montezuma Marsh (at the outlet of Cayuga Lake west of Syracuse), it was rumored that over 1,000 workers died of "swamp fever" (malaria), and construction was temporarily stopped.[6] However, recent research has revealed that the death toll was likely much lower, as no contemporary reports mention significant worker mortality, and mass graves from the period have never been found in the area.[7] Work continued on the downhill side towards the Hudson, and the crews worked on the section across the swampland when it froze in winter.[citation needed]