As the historical water level graphs below indicate, water levels in Turtle Lake have fluctuated over a range of 1.11 meters since 1964. After significant controversy and consultation the Saskatchewan Watershed Authority placed a weir at the South Bay outlet on April 25, 1986 and established the Full Supply Level (FSL) at 654.78 meters above sea level. This weir is still in place today at this level.
In July of 2013 water levels on Turtle Lake peaked at the 50 year maximum of 655.38 m above sea level. (see Historical Peak Levels Chart below)
Outlet of Turtle Lake in June 2005 (no outflow) Outlet of Turtle Lake in June 2007 (19" above FSL)
Updated October 4, 2017