Snowmelt Flood Watch
In heavy-snow country — Quebec, Ontario, Manitoba, New Brunswick and the northern US from Maine to North Dakota — the biggest flood risk often comes in spring, when months of snow melt fast. Floodwater over a wellhead can carry bacteria and nitrate into your drinking water.
Live snowmelt & flood alerts
Checking Environment Canada and National Weather Service alerts…
- Hydrologic Outlook Alaska Hydrologic Outlook issued October 27 at 3:36PM AKDT by NWS Fairbanks AK
- Ottawa River forecast Ottawa River (ON/QC) Forecast for 2026-10-27
- Manitoba flood bulletin / news Manitoba Province Provides Update on Repairs to Provincial Trunk Highway 83 Shell River Bridge
- Manitoba flood bulletin / news Manitoba Governments of Canada and Manitoba Partner with Peguis First Nation and Fisher River Cree Nation for Phase 1 Flood Mitigation
- Ottawa River forecast Ottawa River (ON/QC) Forecast for 2026-10-20
How snowmelt floods happen
- Snowpack builds up all winter, storing months of precipitation as snow and ice.
- A fast thaw — a warm spell, warm wind or strong sun — releases that water in days instead of weeks.
- The ground is still frozen, so meltwater can't soak in. It runs off into ditches, streams and low ground, and pools around wellheads.
- Rain on snow makes it worse: rain melts the snow and adds its own water on top.
- Ice jams on rivers can back water up suddenly, flooding areas upstream even without heavy rain.
Classic spring-flood hotspots
- Ottawa River valley (ON/QC) — record floods in 2017 and 2019 when heavy snowpack met spring rain.
- Richelieu River valley (QC) — the 2011 spring flood lasted for weeks around Lake Champlain and the Richelieu.
- St. Lawrence watershed and the Montreal area — tributaries, Lac des Deux Montagnes and river islands flood in high-water springs.
- Red River (ND/MN/MB) — a flat, north-flowing river that melts upstream first; Fargo and Winnipeg prepare every spring.
- Saint John River (NB) and northern New England / New York rivers, where ice jams are common.
Before and during the melt: protect your home and well
- Clear drainage: open snow-blocked ditches, culverts, downspouts and storm drains so meltwater can flow away.
- Move snow away from the foundation and the wellhead.
- Check the sump pump, test it with a bucket of water, and have backup power (battery backup or generator).
- Protect the wellhead: make sure the well cap is tight and sealed, the casing sticks up above ground, and the ground slopes away from it.
- Know your local alert source — in Canada, flood warnings mostly come from the province or conservation authority (see below).
- If floodwater reached the well, don't drink the water. Disinfect the well, then test for coliform bacteria and E. coli, and again 1–2 weeks later. See EPA: what to do with your private well after a flood.
Official flood sources
Quebec — Vigilance (crue des eaux)Province-wide river flood status and forecasts (Ottawa, Richelieu, St. Lawrence tributaries). French.Ontario — Flood Forecasting and Warning ProgramProvincial and conservation-authority flood messages from the Surface Water Monitoring Centre.Conservation Ontario — flood messagesWhat each Ontario flood message level means, and how to find your local conservation authority.Ottawa River Regulation Planning BoardOttawa River level and flow forecasts (live headlines shown above).New Brunswick — River WatchSaint John River freshet forecasts (spring season only).Manitoba — Flood informationRed River and provincial flood bulletins and spring outlooks.NWS North Central River Forecast CenterSpring flood outlooks for the Red River of the North, Upper Mississippi and Great Lakes states.NWS Northeast River Forecast CenterRiver forecasts and spring flood outlooks for New England and New York.Environment Canada — public weather alertsRainfall, snowfall, freezing rain and winter storm warnings by province.
US flood alerts Flood Watch cameras Flood protection guide
Alerts from Environment and Climate Change Canada (MSC GeoMet), the Ottawa River Regulation Planning Board, the Government of Manitoba and the US National Weather Service. Not an official advisory — follow your provincial, state and local emergency officials.