The east end of Big Blue will freeze early, Sapinero in late January. I've fished right at the east end, just below the bridge and you get a good mix of bows, browns and lakers if you fish 20-50FOW. I've also gone across the bridge about two miles to the Iola boat ramp. That's very easy access to the ice and there's a rocky point about 200 yards to the west that gets a lot of fishing traffic. I did OK over there last year in 60-70 FOW. I also have fished from a picnic area about 2 miles west of the first bridge but I can't remember the name of the area. It was about 80FOW and I did real well there though none were of any great size.