Lake Levels and Runoff Good News and Bad News May 22, 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 today’s (Tuesday May 22) projection for the next 10 days, we estimate that the lake level will rise to its annual peak by the 29th of May, an increase from today’s level of 0.34m (13.4 inches) and then start it’s slow decrease over the summer. Remember that weather forecasting is an imperfect science so don’t remove the sand bags yet. That is the good news.
The bad news is that the rapid runoff from the lake’s tributaries has washed 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 have heard reports of boaters hitting debris and badly damaging their boats.
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.