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Brenden if the footing is underground with long bolts attaching a steel pier then no worries as the temperature stays reasonably constant. If the concrete is brought above ground and used as the pier I would at least use some mesh to reinforce it. It is not that there is likely to be a great amount of stress or strain due to load but it will be subject to larger temp variation which means expansion and contraction which always leads to cracking. The mesh/reinforcing will help in this regard.
Mark
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