I have on a few occasions found nests of Pantherophis eggs in the narrow less than 1" gaps under bridges crossing canals and creeks. Though the substrate (concrete) is dry, the micro habitat is very humid. Water evaporates off the creek and to some extent gets trapped under the bridge.

Here's a clutch of hatched fox snake eggs that has fallen from a gap under a bridge:



I incubate some of my colubrid eggs suspended off the substrate using a plastic grate. I don't know how much it helps, but I haven't had any problems with this method.
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