Mar 30, 1998
Unseasonably warm weather resulted in rapid melt of the snowpack on the Tug Hill plateau. The snowmelt combined with additional rainfall caused the Black River to rise over its banks and exceed flood stage at Watertown. Lowland flooding occurred both at Carthage and Castorland. The river remained above flood stage at Watertown through the first week of April.
Source: NOAA National Weather Service Storm Events Database (event 5630956). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Jefferson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.