Widening Driveway Help

   We want to widen our driveway to make it easier backing our camper into driveway. We now have about a 16 foot concrete pipe under driveway, I want to know can the concrete pipe be extended? I have searched on the internet and I haven't been able found any help. Our County Highway dept will install a new pipe if we buy the pipe, but concrete pipe is expensive. They suggested a metal pipe but what I have read it doesn't last long and concrete seems to be the best choice. Extending the concrete pipe seems like that would be the best thing to do, but not sure if that is possible. Does anyone have any advice or have tried this before? Thank you

I take it you have talked to the Highway Dept. They are experts at drainage access to a major road from a driveway. I had to build a bridge and it had to be approved by the county. There almost has to be an inspector or a dept that handles these issues. If it is a standard drainage ditch I would go with galvanized pipe. It comes large and long. You probably will need concrete abutments on ends. One of those cases where local folks may have the answer and regulations, not the internet. When I did my bridge, I had to go thru county engineer for approval. That's why I take it - you are dealing with a drainage ditch not a water way. I would say a galvanized pipe will outlive you.

Can you get corrugated plastic pipe in your area? We replaced an old 10 inch concrete culvert with a 12 inch corrugated plastic culvert on our driveway. We needed the additional capacity. The corrugated plastic is HDPE (I think). Corrugated on the outside and smooth on the inside. If you need to extend an existing pipe (like your concrete pipe), I believe they make connectors. We got ours from a place like this.

If you have he space to do a second entrance, why would you even want to widen your driveway so you can back your trailer in?  It would be so much easier to have the U driveway and likely wouldn't be any more expensive.  

If you have 16' of concrete culvert, that's two 8' sections. Each section has one straight end and one flared gasket end for fitting them together. So, yes, you can extend a concrete culvert with another section of the same diameter pipe. You will have to excavate one side of the driveway to expose the end of the existing culvert and level the ground to bed the new pipe in. Concrete culvert is heavy....around a ton for a small diameter and they go up from there, so a backhoe or excavator is needed.