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"Creek has never rose above 24" in spring run-off in the 30 odd years I have been here."
A 12" culvert isn't gonna handle maximum flow.
If we call the creek bed 72 inches wide and highest he has seen 24 inches, that gives 12 square feet.
I would stay with the span idea, either "I beams" or heavy timbers.
Hopefully that would keep things from getting washed away if the big rain comes.
Have fun.
Les
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Les
My train of thought has been replaced by a bumper car.
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