Willow Creek update- Drove by to take a look today, it's all capped with snow on it. No signs of snowmobiles, two small groups were on the ice near the first parking lot. I didn't check the ice thickness but I assume it's ok if you check as you go and stay off with machines a little longer.
I've used a sled on Willow Creek either 3 or 4 years ago. When I was there Bernie was there with some clients on sleds. It was late December, before Granby was ready. We both caught a bunch of rainbows. I'm not sure if sleds are still allowed, but they were then.