Check with NRCS to see if the 30" pipe will handle the water that will enter the pond in a 50-100 year rain event. Then and only then if they say it will, would I take that idea further.

30" dia PVC isn't light. How would you put sections together, shove under the road to the other end, and then life the 30" vertical section to put in the elbow? You talking about gluing it together or using rubber gaskets and belled end pipe?

I think this is a bigger job than your usual DIY project.....

Once the PVC is installed in the existing pipe, I'd look at filling the 6" void around it with concrete to stabilize the whole thing.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).