Lake Levels and Runoff May 28, 2018
As indicated in our last post we have been tracking the Provincial runoff and river level forecasts for the Shuswap Lake and the South Thompson River. The Province provides a daily forecast for the South Thompson River at Chase discharge for the 10 days into the future based on mountain snow pack data and weather forecasts. We then use their projected flows to calculate the expected change in Shuswap Lake levels over that period. Based on the last posted projection (Friday May 25th), we estimate that the lake level will rise to its annual peak by the 29th or 30th of May. Looking at the current data for lake level, the discharge in the Thompson River at Chase and in the main tributary rivers (on the morning of May 28th), the lake level looks to have peaked and will remain at this level for several more days before starting a slow decrease over the next month or two.
The weather forecast is for partly cloudy weather with a chance of showers over the next few days but not enough precipitation to seriously affect the lake inflows. Remember that weather forecasting is an imperfect science so don’t remove the sand bags yet.
Runoff from the lake’s tributaries continues to wash a lot of debris out onto the lake making boating very hazardous. If you are going to be out boating on the lake be cautious.
We will continue monitor this information as it is released by the Province and will provide you with an update if there is a substantive change in the projections.