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That's a great document; thanks for the link.

If we go with road base, should we use it all the way up the culvert, from the current streambed level, or start higher up the culvert's side? Thanks again for your feedback.

Could you describe what good soil would be? We have two kinds, a red, clay-like, soil, and a brown topsoil. We were planning to use the red soil.

cvg: By "good quality structural backfill", do you mean we need to use crushed aggregate, or good quality soil? We had planned to transfer soil from an area nearby, but that is in good shape (not marshy/muddy soil). I thought that the fill, near the haunches, should not be crushed aggregate...

Thanks for the feedback re: permits. We are looking into this more on your advice.

Thanks everyone for your responses. Much appreciated! We are in a rural area and have looked into the rules re: stream crossings. It seems that agricultural purposes end up incurring much more lenient rules than residential, so hopefully we will be ok by the law. Re: the crossing weight. Most...

Can you explain more about what you mean by "will this be a siphon?", at least in this context. Do you mean drain the water out first? We are currently planning to dig a new trench for the culvert and then redirect the stream through it, once installed, so that we aren't working in the mud.

Thanks for your response! The culvert is metal, so we'll add extra fill over the pipe. Also, how much lower than the stream should the metal pipe be inserted? Would it still be 18" below the flowline?

We would like to install a culvert in a running streambed, in order to provide better access to a back lot on a farm. The stream is small, I don't know flow rates, etc, but I would say it is 2 inches deep, 18" wide, at the most. The flow rate doesn't appear to change dramatically, even after...