Valentines Day weekend 2021 North Texas and much of the South East United States was hit by a polar vortex plunging temperatures in the DFW area to record lows in nearly 100 years with wind chills in the negative teens. On Tuesday 16 February 2021 large parts of the lake were frozen over. Local measurements taken in Little Elm recorded 2" thick ice at 150ft from shore with water depth approximately 11ft. Closer to shore ice exceeded 5". Lewisville Lake has never frozen prior to 2021, since the Garza-Little Elm damn being breeched in 1957 to create the current Lewisville Lake.