Anyone ever built one? I have a creek crossing that has gotten deeper over the past 20 years. Every time we get a toad floater it chews the gravel bottom out deeper to the point that it stays 2ft deep or more long after it runs down.

I don’t want culverts or precast box culverts because it gets wild enough during a big flood to tear those out. I’m thinking just a concrete slab 10-12ft wide by 60-70 ft long.

Any other ideas?