Jul 1, 2019
Excessive runoff into the Ottawa River Basin in Canada restricted the outlet of Lake Ontario. This combined with above normal precipitation into the Lake Ontario Basin, record levels on the Great Lakes above Lake Ontario, and higher than normal flows into the lake from the Niagara River pushed the lake to well above normal levels. Over the course of July, water levels began to slowly recede, however after starting the month about 5.5 feet above low water datum, the lake only fell to just below 5
Source: NOAA National Weather Service Storm Events Database (event 868162). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Niagara County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.