Edison
My wife and I rode out of Edison Sno Park on Sunday,12/18 and were the only sled trailer in the lot. The trails out of Edison had not been groomed when we unloaded but there were tracks heading out in various directions... We ventured West out of Edison on Trail 3 and only made it a couple miles before finding by a large tree blocking the single track in an area that resembled your photos of the "bottomless pit". We decided to turn around before getting both sleds stuck.
After heading back to Edison, we rode on the single track West around Trail 2 to Cascade Lakes Hwy and then North to Elk Lake Lodge for a tasty bowl of their chili and a beverage. We only encountered two other sleds in passing on the 14 miles of Trail 2. The snow level is building up pretty good along 2 with miles of fresh tracks available. There was still LOTS of good opportunity to find the bottomless pits if you weren't careful.
According to the NOAA site for Wanoga Butte, it's supposed to start snowing on Friday, 12/23 which will help with the hordes of people who are already in town for the Holiday weekend. We hope to get a couple days in over the Holiday but have not yet decided which way to go...