I've had many black locust, white cedar, and white oak posts rot out in 10 years - usually just at ground level. Many variables, I guess. Soil conditions, temps, acidity, moisture, etc.
When it comes to treated southern yellow pine, it's more predictable. A properly treated post can easily last 50 years. A poorly - or lightly treated post can rot out in 5 years. They come in many different levels of treatment.
Power company just redid their transmission lines and poles here.
I'm surprised you can even find any place selling CCA posts to consumers anymore. Most are selling ACQ or equivalent with very light treatment and not meant for any use below ground. Even the pressure-treated 6"X 6" posts Home Depot sells are "about ground" or "at ground" use only.
By the way, back when we Central Tractor was in business here (before TSC), I bought a truck-load of their CCA treated SYP posts. 5 and 6 footers. That was about 15 years ago. None have shown any signs of rot, but I have no idea what level of treatement they had.
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