I've got a similar spot, flow looks pretty close. I put in a 36 inch with 2 feet of top fill and 6 inches of crushed stone on top. Did great until a 20 year rainfall event sent the whole mess a quarter mile down stream. Now I've got the 36 with a 24 beside it, aligned top to top so the 24 only kicks in at high flow. The whole thing is capped with a 10 foot wide 22 foot long 8 inch concrete slab. Slab is 3500 psi, fiber reinforces with 4 inch pipe 6 inches apart with welded bracing to hold it in place for rebar. At each corner I dug 36 by 36 inch bell holes and let the concrete fill them too as anchors. Bridge has a v in the center and slopes toward down stream to allow for overflows. Water has been over it 3 times in 10 years.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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