Placing below the bridge might not be the best. High water floods in that area and screws up the access roads. Huge deep puddles form preventing access. The high bank from the bridge up would survive any high water event.
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"Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.” – Ferris Bueller.
Don't let the old man in!
"Hilight it, Daylight it, Mack it out"