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I really like this one bridge posted but if the six foot pipe lasted over a century just replace it. .......................
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This bridge didn't magically appear one day. Time passed between the time my FIL offered to sell us some land in the mid 80's and the day we broke ground in late 1989. The land had to be subdivided off his one farm. Seemed like an awful lot of red tape, approvals and meetings upon meetings till we finally got the OK to start. The plan was to have four lots so he could eventually sell to three other family members if they wanted them. We built on the West lot and my one BIL built on the East lot a few years later.
There are two bridges. They're built on the property lines of the the outer "pairs" of lots so two bridges serve four lots. Pop said the first kid who builds a house needs to build the bridge and then negotiate with another who builds next door. After more than 20 years later no family members were interested in the center two lots, so my BIL and I checked into buying the two center lots and each taking a part of the neighboring lot for a buffer and selling what was left as one lot in the center. When we received a quote for the cost of engineering / approval / etc that idea was dropped. We each bought the lot adjacent to our properties.
But back to the bridge. As mentioned, the engineer designed the bridges to take big loads. The 16' wide bore was determined by flood data and runoff studies. Oddly, the creek comes through a 4 foot "squash pipe" under the road less than 100' West of our West boundary. There's also a very small culvert under the road that dumps into the creek on our property.
The engineering study indicated that the effect of the two bridges in the flood plain were negated by taking a bend out of the creek. That was a win because it allowed building the bridge on dry land, then moving the stream channel. My BIL built a few years after that and the stream wasn't relocated for his bridge. IIRC, his contractor did a pump-around. When the creek floods, the difference in the elevation of the water upstream of the bridge and downstream of the bridge is not noticeable.
I priced the material for the bridge (think it was a bit over $1K just for the rebar at the time) and I forget how much for the concrete. I was seriously considering building it myself. It has footers down something like 9' and a 12" foundation. Our builder was slow at the time and gave us a price that made it look like he was just doing it for fun. That made it an easy decision. I already had a lot of work to do. My only involvement with the bridge construction was getting Sonotube for the builder to split and make the radiused side forms easier. Good plywood salvaged from the formwork became our attic floor.
Our contract with the builder was only for masonry, framing, insulation, siding, roofing, finish carpentry and drywall. I hired the excavator, cabinet guy and painter. I did the electrical (complete with concrete duct bank under the creek for utilities), security system, central vacuum, phone wiring, underslab drain to daylight, sound system rough-in. Borrowed a mole and compressor from work to get across the road to the water main that runs into town. I also did the plumbing and HVAC with help from a plumber/HVAC guy who returned the favor for helping him with the electrical on his new house about 4 years earlier. This was before digital pics, internet, tractor boards etc. It would have been an interesting thread.
