I'm a little confused about your real question. But, 60 tons of gravel is a little over 2 truckloads, probably 3 as trucker 40 says. Not sure how many axles on the typical single trailer they use up here in Michigan, but I have 25 ton loads delivered all the time. I also just recently put in a culvert. The drainage flow required a 42" diameter culvert which would have been higher than I wanted, so I got a corrugated steel one that is kind of an oval shape, It was about $400 for a 20' section, so call your county road commission and see about buying it through them. You'll probably get their discounted price. Extending a 12" culvert with a round corrugated one shouldn't be too pricey. I don't think they even allow concrete culverts around here anymore (that is, if you're getting a permit and all). As for fill, the key is to use sand and pack it in 3-6" lifts alternately on either side. I hand tamped mine, no need to rent a vibrating tamper. Don't just dump dirt/gravel in on either side. Once you've built it up and have 6" or so of sand over the top, go ahead and put your dirt and/or gravel topping on it. A properly installed culvert with sand backfill and 10-11" of material over it should handle those heavy loads. Not sure about the old concrete one. What kind of condition, it's in, etc.
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