Flood Warnings and Advisories

Flood Warning – West Kootenay (UPGRADED)
Flood Watch – East Kootenay (UPGRADED), Boundary (MAINTAINED)
ISSUED: 3:00 PM May 31, 2020

The River Forecast Centre is upgrading to a Flood Warning for:

  • West Kootenay including the Slocan River, Salmo River and surrounding tributaries

The River Forecast Centre is upgrading to, or maintaining, a Flood Watch for:

  • East Kootenay including the Moyie River and surrounding tributaries (UPGRADED)
  • Boundary Region including the Kettle River, West Kettle River, Granby River and tributaries

Severe thundershowers yesterday and this morning have been spread over the region. Rainfall amounts in the 10-50mm range have been observed over the past 24 hours, with heaviest rainfall amounts overnight in the West Kootenay, and this morning in the East Kootenay. Rainfall has continued over the past 4-6 hours, with amounts in the 10-20 mm range (approximately half of the storm precipitation total)
River levels have been rising rapidly in response to this rainfall. River levels in the 2-year to 20-year flow range are being observed throughout the region. With on-going rain this morning throughout the region, river levels are expected to continue to rise through the rest of Sunday and into Monday for larger river systems.
A summary of current conditions includes:

  • West Kettle River at Westbridge (Water Survey of Canada gauge 08NN006) is flowing at 110 m3/s and rising (2-year flow). Flows are forecast to reach up to 150-200 m3/s (5-year to 10-year flow) later today or overnight
  • Kettle River neat Westbridge (08NN026) is flowing at 250 m3/s (between a 2-year and 5-year flow) and rising. Flows are forecast to reach up to 300-350 m3/s (5-year to 10-year flow) later today or overnight
  • Granby River at Grand Forks (08NN002) is flowing at 240 m3/s and rising. Flows are forecast to reach up to 300-350 m3/s (5-year to 10-year flow) overnight or into tomorrow
  • Slocan River near Crescent City (08NJ013) is flowing at 560 m3/s (5-year to 10-year flow) and rising rapidly. This river is responding more quickly than anticipated with hydrologic modelling and may reach up to 600-650 m3/s later today or overnight (10-year to 20-year flow)
  • Salmo River near Salmo (08NE074) is flowing at 360 m3/s (10-year flow) and rising. Flows are forecast to reach 400-450 m3/s (20-year to 50-year flow)
  • Kalso River below Kemp Creek (08NH005) is flowing at 120 m3/s and rising (2-year to 5-year flow). Additional rises are expected Sunday afternoon and evening, with flows of around 150 m3/s (10-year flow) possible
  • Bull River near Wardner (08NG002) is flowing at 330 m3/s (10-year flow) and rising rapidly. Modelling is indicating the potential to reach 400-500 m3/s tomorrow
  • Kootenay River at Fort Steele (08NG065) is flowing at 975 m3/s (2-year flow) and rising. Forecasts are indicating the potential to reach up to 1400-1800 m3/s tomorrow

 

The public is advised to stay clear of the fast-flowing rivers and potentially unstable riverbanks during the high-streamflow period.

The River Forecast Centre continues to monitor the situation and provides updates as conditions warrant.

Contact for Media Relations, Ministry of Forests, Lands, Natural Resource Operations and Rural Development:
Tel: 250 356-7506

Levels of Warnings/Advisories:

  1. High Streamflow Advisory: River levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible. This is the lowest level.
  2. Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur. This is the intermediate level.
  3. Flood Warning: River levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result. This is the highest level.

Links:

  1. Home of River Forecast Centre
  2. Current Streamflow Conditions and Flood Forecast Modeling
  3. Map of Current Streamflow Return Periods for All WSC Stations
  4. CLEVER Model 10-day Forecasts of Discharges and Return Periods
  5. COFFEE Model 5-day Forecasts of Discharges and Return Periods
  6. Back to page of Flood Warnings and Advisories