Flood Warnings and Advisories


Southwest Region

High Streamflow Advisory – Fraser River (MAINTAINED)
ISSUED: 3:30 PM June 28th, 2020

The River Forecast Centre is maintaining a High Streamflow Advisory for:

  • Lower Fraser River

The Fraser River at Mission reached its highest level of the season of 5.91 m (08MH024) on Monday morning. Flows and water levels are beginning to recede; however, another heavy and basin-wide rainfall event is forecast for Wednesday through Friday. The storm event has potential to significantly increase flows for the Lower Fraser early next week.
Most recent observations are:

  • Fraser River at Shelley (08KB001) peaked at 4,000 m3/s (between 5-year and 10-year flow) near noon on Friday and is receding.  The current flow is 3,440 m3/s
  • Fraser River near Marguerite (08MC018) peaked at 5,700 m3/s (between a 5-year and 10-year flow) at noon on Saturday and is slowly receding.  The current flow is 5,320 m3/s
  • Fraser River above Texas Creek (08MF040) peaked Sunday morning at 6,590 m3/s (between a 5-year and 10-year flow).  The current flow is 6,300 m3/s
  • Thompson River near Spences Bridge (08LF051) is flowing at 3400 m3/s (between a 5-year and 10-year flow) and gradually rising
  • Fraser River at Hope (08MF005) peaked at nearly 10,500 m3/s (between a 5-year and 10-year flow) on Sunday evening.  Flows remain high at approximately 10,100 m3/s
  • Harrison Lake near Harrison Hot Springs peaked with a water level of 12.1 m on Monday morning.  The lake has remained high, and has only dropped 4 cm
  • Fraser River at Mission (08MH024) reached 5.91 m on Monday morning. It is currently flowing at approximately 11,300 m3/s with a water level of 5.77 m

There is 50-70 mm (or higher) forecast in the headwaters of the Fraser River, including the Upper Fraser East, North Thompson and Cariboo Mountains. Major tributaries of the Fraser River reached their highest levels of season over the past five days, making them highly vulnerable to any additional rain. Today’s CLEVER model output shows extremely high forecasts (>100-year return period) for the Upper Fraser – upstream of Prince George, the Quesnel Region, and the North Thompson. Fraser River at Hope (08MF005) results show the river peaking on Sunday at 13,720 m3/s. A reminder that the CLEVER model is based on weather models and has high amounts of uncertainty, but if the heavy rainfall occurs as forecast Wednesday through Friday, flows will increase substantially to the highest levels of year.  

The Ministry of Forests, Lands, Natural Resource Operations and Rural Development produces 10-day Lower Fraser River Water Level Forecasting and results are available at: http://bcrfc.env.gov.bc.ca/freshet/lower_fraser/LFR-10-DayFloodLevelForecasts.pdf

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 conditions and provides updates as conditions warrant.

BC River Forecast Centre

Ministry of Forests, Lands, Natural Resource Operations and Rural Development

A High Streamflow Advisory means that river levels are rising or expected to rise rapidly, but that no major flooding is expected.  Minor flooding in low-lying areas is possible.
A Flood Watch means that river levels are rising and will approach or may exceed bankfull.  Flooding of areas adjacent to affected rivers may occur.
A Flood Warning means that river levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result. 

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: 250-213-8172

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