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Usually Confused
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8,207 Posts
Except for interlocked ones like Neal shows, most around here are fist-sized fieldstone, mainly because it readily available and cheap. You could also go with large crushed(don't know the designation). Soil won't stay.
 

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Usually Confused
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8,207 Posts
I have one of those plastic culvert pipes on the entrance to my bottom property - it's worked well for 25 yrs or more. Even had a concrete truck go over it once.
Yes, the municipalities and provincial highways departments up here must be doing it all wrong if plastic is bad. Part of the battle with any culvert is the amount of cover to distribute the load, and OP appears to have lots.
 
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