I haven't yet but quite a few people have been hitting them for the last 2 weeks. Chain lakes are above 3000' which is why they're fishable. Postings are on the Washington ice fishing facebook page which is moderated by Tyler Hicks (Spilt milt on ice shanty) Coffin seems to be brookie heavy with gillette having a better mix of trout/perch. Yeah I was super stoked when I saw all the lakes that were open. There are a few lakes in that watershed that aren't open ( frater comes to mind) so check the WDFW site. Quite a few closer to SPO are also open as of this year-Jump off Joe, Davis, Sacheen, Diamond, Horseshoe. Jump off Joe was capped but unsafe. Temps should be dropping in the next couple of weeks making all these good to go. I'll be hitting gillette on 12/27-I'll post how it went.