Do I really need a pipe crossing?

It's been raining steadily for days here (>100mm) and more to come, the Orara river to which my creek flows is in flood, and the creek is only a few feet from going over the nearby bridge (cutting me off from the highway).

My pipe crossing driveway (cost $5610) doesn't have any water flowing through it, not surprising since it's on the crest of a hill - thanks to the council for forcing me to over engineer!