I'm pondering a longer-term hike in Northern Quebec/Labrador. Autonomous style, sky or snowshoe (TBD) with a sled etc. Right now, considering going Fermont, going south to Sept-Iles (possibly following the Rivière Moisie for some of the way). About 400k give or take, though I might downsize that and leave from somewhere else (south of Fermont, along the road) if that seems to be too ambitious.
I have tons of experience in winter outdoors and winter camping, so that aspect of things I am not worried. I would like to know what would it look like in terms of navigation in that region/environment for a thru-hiker in winter, more precisely for River/lack crossing. I have read this post (How to be safe on lake and river ice and what should I do when I fall through?) on the topic. However I'd be interested to know what to look for (from a topographic perspective) as to where should I expect better odds of finding a good crossing.
1 - When looking at a topographic map, what clues (variations in widths, winding or not, upstream or downstream, etc) may help find a route that is likely to provide better crossings?
2 - In a typical winter, with average temparature for the region (or a comparable region), what are my odds of finding solidly frozen lakes (I am not too worried about those) and finding decently frozen rivers crossings? The Moisie river would be a good example to start from (because it's well-known and a large river)