Cardiff Pass via Mill D drainage

Hi. I just hiked this today. I found a lot of conflicting information as to whether the entire trail is open due to numerous private property and no trespassing signs. However, next to one of the signs was a brown sign that said property on both sides was off limits, but staying on the road was fine. I pretty much did that, and I took each "no trespassing" sign to mean the stuff off to the right or left that wasn't part of the road. Can anyone help me out with any further light and knowledge about hiking this trail? I'm assuming there's a valid right of way from Big Cottonwood over to Little Cottonwood through here, but I could be wrong.