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Lake Ouachita Surface Temperature can vary about 4 degrees or more a day depending on condition effecting the lake.
Current surface Temperature of Lake Ouachita is
47 to 50 degrees.
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Current lake level
Fish Spawning Temperatures Lake Ouachita.
Time of day, weather (clouds, rain and wind and direction and speed) clarity of the water, sun exposure including the angle and duration of exposure, flow of water, whether warmer or cooler into lake, mixing of water column layers through wave or boat action, substrates they are in contact with (bottom, shoreline, plant growth), evaporation rate and location on lake all play a part in surface temperature.
Surface temps of water in mid summer may reach as high as 100 degrees, although the water 2 ft deep could be significantly cooler.
What you talk water temperature variants you are discussing principles in limnology.
Water maintains its temperature very well. The ability of water to retain
dissolved oxygen is also related to temperature.
The density of water changes,
based on temperature, cold water is denser than warm.
Hot water holds less oxygen. This is one reason you can fish in the later in the summer.
The thermocline is a cooler oxygen rich layer of water usually in the 15-35 ft depths on
Lake Ouachita.
This is where you can get some errant data. If a cove was very calm and
undisturbed as you entered it your temp sensor, you are only measuring the
top surface temp. If there has been several days of high sun and dead wind
the surface temps will raise significantly compared to the water just below.
Also If there is a steady wind it will stack up the warmer water on the wind
blown bank. Most people do not realize that even a mild constant wind can
actually push the water in Lake Ouachita to the windblown side of the lake
to the point of creating 1-2 ft differences in depth. The effect is so
gradual and over such a large area is is nearly impossible to see.
In the winter the northeast side of coves that are relatively undisturbed on the north and east side of the lake that have the north shoreline protected by hills or trees will warm the fastest. Stained to muddy water over shallow graveled lake bottoms and little to no shade or plant growth will warm quickly.
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