I did a little research and found that there were lots of places to hunt for Jade in the Creeks below SR 20. So off we went.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/creeks/deer-creek-oso/reports/northwestrocks.blogspot.com.md
It’s a rough road, so a four-wheel-drive vehicle is recommended. Keep in mind that the road is not maintained and the conditions can vary based on the weather.