Hi Chris, there is not much information about this area. It's probable that back country skiers go this way in winter because we found some sort of ski binding not far from Three Falls.
We knew we had to avoid the Three Falls gorge, and as we hiked we judged the terrain accordingly. We were willing to circle around difficult terrain etc. The more common route to Red is via the Skyline 2 trail and then when the trail veers off to Mowich camp on the west side of Lone Goat, you continue route finding along the ridge to Red. We decided to take a more direct route but had only an estimate of what lay between Three Falls and Red. Ingrid and I have been doing more and more route finding over the years, so maybe that gave us the experience we needed and intuition about difficulties that might lie ahead.
The Three falls area is a gorge that cuts through the forest and heads north west-west towards Nepopekum and Shawatum peaks. I could see that on various maps and Google Earth. The closer you get to the gorge, the more cliffs you may encounter. We aimed for the broad flat area leading to Red, Lone Goat, and Snow Camp. We managed to travel at a good time when even though the water was high in the creeks, there were snow bridges to help us cross.
Maybe you could try route finding on shorter less critical hikes and work up to larger expeditions? That's been my method of learning. I hope that helps.