this is one of the most common causes of damage and failure for low-cost small radio towers (such as a 60' to 80' that a ham radio enthusiast might erect in their yard). Usually because the hollow tubular legs of a triangular lattice tower aren't set into gravel at the bottom of the foundation concrete block, and there's no way for water to drain out. Then you have not only rust issues to be concerned about for corrosion, but also freeze/thaw cycles.

Any tower type with hollow legs can see this problem if not installed right.

Seen with small Rohn 45G class towers that are put up by amateurs.

https://www.rohnnet.com/rohn-45g-tower