Ideas on how to run PVC across a creek

If the creek runs all year the water will never freeze. If not, as stated by another gentleman, insulation or an airspace within a larger pipe should serve you well with a frost line of only 12".

It may help to clear away any brush that shades the line. Heating the water after you get it where its going may be expensive too if the creek water is cold all year.

Interesting challenge.

To keep from freezing, put the 1" pipe inside a larger (3" or 4") pipe. Get several cans of the expanding foam insulation in a spray can (get the kind that expands to the greatest volume). Keeping the small pipe centered in the larger pipe, spray in the foam insulation. You may have to drill an occasional small hole in the larger pipe to get the insulation in the middle of the large pipe. You will want to take it slow and make sure you get a full fill end to end.

This will give you a well insulated pipe that should withstand temperatures well below freezing, particularly if the water is flowing. You may want to use black pipe for the outer pipe for strength.

If your frost is only down 12" it must not get too cold for too long. I'd think you could box it in with 4 to 6" of rigid styrofoam insulation sheet and get away with it. The frost line is 4 feet minimum here, and when we hit bedrock and can't get down far enough, that's what we do.

I've seen black pipe layed on top of the ground, in a "box" of 8" of styrofoam, with a foot or so of dirt over the top. It gets through our Maine winters that way.

Where yours will be suspended across the creek, I'd probably build a wooden box, line it with the styrofoam, run the pipe through the middle and call it good. The purpose of the wood is to keep animals from tearing up the foam, and to give things some support as it spans the creek.

Is the water going to be constantly flowing through this 1" pipe? If so, you may not have an issue at all.

I'll be curious to see some of the other suggestions. I'm sure there's some better ones then mine. :-)