A couple days ago I filled in an area to make it at least slightly passable by my tractor.
This whole area to the right of the fence is rocky and slopes down to the right; the fresh fill had a drop of about three feet from the left to right which coupled with the lumpy ground made it basically a no-go with the tractor.
It's definitely not pretty, nor is it particularly smooth. I have a turn-around loop down by my barn (in the direction the tractor is pointing) which I cut a bit more from the side, making it just slightly easier for my long bed crew cab truck to negotiate the loop without having to back up if I missed the turn-in by a foot; this is what we call "Nevada County Red Dirt" - lots of clay with a hint of sand in it. Probably almost perfect for cob, idk.
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The conditions for doing this were perfect - the backhoe scraped it nicely off of the hill without clogging the bucket and it wasn't so wet as to be super heavy for a full bucket, and it still had enough moisture to pack down marvelously. Every bucket that I dumped I packed as best I could, then got another bucket, packed, etc... I was very pleasantly surprised that driving over it, the tractor was very stable. I definitely kept the bucket down low and had my seat belt on during the entire operation!
My two main concerns are that my maneuverability was super limited so I wasn't able to get the very middle of the lane packed, and it's not smooth and nicely sloped for water run-off so it'll likely pool. There's a bit of a slope to the right as it is; I figured I'd let it be a few weeks and then possibly dump more on it.
Still, my main need for this passage is only slight - I'll likely only have the tractor go through there spring through fall maybe ten times total when my wife needs more soil to top off garden beds or maybe if I finally get around to excavating a small pond next to the garden space up there; I have an access to our driveway at the bottom of this area and this passage provided an access to my barn road at the top, so it just provides more transit options.