I pulled up what appears to be some lake skating already available, checked out Instagram using "wild skating" as my search phrase.
https://www.instagram.com/p/CW5-rz0pb76/ (Middle Lake)
https://www.instagram.com/p/CWg9SCev9Qh/ (Johnson)
Tanya Koob is a good resource, you can find her blog and other social media, easily, with google.
Check Paul Zizka's social media out as well - he often takes pics of himself & others out skating on the natural ice surfaces in the area.
Elladj Baldé, if he's not out of town at appearances, does a fair amount of wild ice skating as well. Same thing, check out his SM. I'd imagine you could contact any of them through social media and find out information from them.