Submitted by Grant Simmie June 2018:
“I have a cottage in Oliphant. I maintain my own graphs of water levels to entertain myself. With the summer season here, I thought followers of this web site might be interested having a look at them.”
This graph indicates water levels are likely to be about 5 to 6 inches higher this summer than last. There may of course be complex factors at work that reduce the predictive accuracy of a simple graph.
I like this graph because it shows the seasonal pattern of water levels decreasing in the fall and early winter and increasing in the spring and summer.
Historical water level data has been recorded since 1918, which is exactly 100 years ago. This 100-year graph illustrates the cycle of highs and lows and the extreme difference between them.