Yeah man. Probably going to do the original driveway in millings also. Right now it's half n half. The wife isn't too keen on the non uniform color Another thought is to tar n chip it. That will unify the color, but have a legitimate solid surface in front of the house/ main garage. We have so much road work towards the city that RAP is a very economical way to go. And it's usually got so much binder in it that it self hardens for the most part.A lot cheaper than crusher run or rock waste, which is what I used to cross one drainage ditch on my property. I have clay soil so one got put in the second ditch with just the clay which was very dry and crumbled nicely when I set the culvert. The biggest objective is to make sure you pack as you fill, unless you use sand/crusher/millings which will self-pack. The dirt is what's supporting anything that goes over the culvert. The culvert just makes a hole for water to get through. The double wall is to keep the inside of the culvert smooth so that silt/sand don't settle in the corrugations and give roots a place to get started which will lead to the culvert getting plugged up.
I'm about to test my theories about the strength of the culvert in a couple weeks. I put the culvert in shortly after I bought the LX, and its been holding up beautifully since. Having 4 trees taken down behind my shop, and the tree service is bringing in a monster to take them down in chunks. Sorta like the giant tree cutters, but just a straight boom on a machine similar to an industrial crane. I'm hoping to get a few saw logs out of all of it.
Guess I should call the county to see if I can just do it, or if I need some silly permit.