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 - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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