Both good points, however, placing a camper frame or other ad-hoc structures over a creek, while it may work for a short term, for a snowmobile, is not engineered to hold the weight of a groomer + snow, never mind what some joker might try to use it for in the off season. If it fails, the MNRF is on the hook, liability wise, because it’s on Crown Land. That’s why they’re so anal about it. I’m aware of a similar situation that occurred north of Nipigon. The club installed an old truck frame across a river. Unfortunately, it wasn’t long enough, so the contractor pushed the banks into the river until it fit. It was not pretty. I can assure you that asking forgiveness later didn’t work, and it was expensive to fix.