Sand Pits (in Nebraska) are directly related to the water table and similarily the Platte, Loup etc...
When irrigation season rolls around the water table can get drawn-down considerably...on some of the isolated bodies of water with no flow coming in or no direct ground water influence, evaporation and evapotranspiration can reduce water levels also.
That's why a spring or creek is nearly essential to have on these fairly small isolated watershed dams being constructed...if there is zero water source even run-off, it doesn't matter how deep the pond is it won't be suitable for fish habitat.
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