![]() The middle layer which rapidly decreases in temperature from the uppermost is called the thermocline. ![]() The uppermost and warmest is referred to as the epilimnion. ![]() For the science minded, three distinct layers form. Warmer water is less dense and stays at the top. Throughout the summer lakes slowly develop temperature dependent layers also called stratification. They provide the most consistent water quality and oxygen levels during turnover and baitfish will gravitate to them drawing in larger fish as well. Fish have to eat, so opportunities are still out there. A complete turnover can take days or maybe a week or two depending on the weather and can cause an immediate, but thankfully short lived, decline in fishing. Early to mid-October is the typical time this happens in Lake Granbury. Lake Granbury is part of the Brazos River basin, and like almost all of the reservoirs in the basin, is deep enough for these turnovers to occur. This process redistributes oxygen and nutrients in the water and is essential for fish to continue to thrive. Lake turnover is a natural part of the lake ecosystem that takes place in both fall and spring. These are all signs of the dreaded Fall Lake Turnover, but is it really something to fear? What is the impact of Fall Lake Turnover? There might even be dead fish floating on the surface. You notice the unmistakable smell of rotten eggs. Cooler fall temperatures are a welcome relief from baking summer heat and the lake is calling out for a day of fishing.
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