Flood Warnings and Advisories

High Streamflow Advisory – Fraser River
ISSUED: 1530h May 10th, 2018

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

  • Fraser River  including the mainstem from Prince George through Hope and the Fraser Valley

Persistent warmer than normal temperatures across British Columbia for the past three weeks has led to a much earlier than normal runoff period for the Fraser River. Many of the gauge locations along the Fraser River are at or above their historic flows for this early in the freshet season.
A summary includes:

  • Fraser River at Shelley (Water Survey of Canada gauge 08KB001) is flowing at approximately 2900 m3/s (approaching a 2-year flow)
  • Fraser River near Marguerite (WSC 08MC018) is flowing at approximately 5070 m3/s (between a 2-year and 5-year flow) and rising
  • Fraser River above Texas Creek (WSC 08MN040) is flowing at 5500 m3/s (2-year flow) and rising
  • Fraser River at Hope (WSC 08MF005) is flowing at approximately 8500 m3/s (approaching a 2-year flow) and rising
  • Fraser River at Mission (WSC 08MH024) is at approximately 9300 m3/s and 4.8 m

Warmer weather earlier this week has increased snowmelt runoff across the basin. Rises through the lower reaches of the Fraser River are expected to continue into the weekend. Flows at Hope are expected to reach up to 10,000 m3/s over the weekend (water levels at Mission up to 5.5 m).
Over the weekend and into next week, high pressure is forecast to dominate the weather pattern across British Columbia, with warmer temperatures late-weekend, and hot temperatures forecast across the Interior early next week. Ongoing accelerated snow melt is expected to lead to ongoing rapid rises on the Fraser River throughout next week. Current modelling is indicating the potential for flows in the 12,000 m3/s range at Hope (gauge level at Mission of approximately 6.0 - 6.5 m) by late next week, and potentially higher over the May 19-22 period.


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 River Forecast Centre will continue to monitor conditions and update this advisory as conditions warrant.

Contact:
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.
  2. Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur.
  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.

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