I second what slayer and Doctor said but will add some.
I went last year and was sad I didn't have a sled. There was more than 16" of snow in mid Feb making it really tough to walk very far. A sled would allow you to get to the west end where the multiple inlets are including the main one. Or just to be able to move around to different spots. It's bigger than I thought.
The lake is very beautiful though and surrounding trees are thick which prevents much wind. Good for keeping warm and the added scenery; bad for not blowing the snow off. It's somewhat isolated so I'd go back if just for the peace and quiet
It was fun to watch my smitty sled take the long, un-manned ride down to the lake but was a slight chore pulling it back up. There was a packed trail but I'm going to bring snowshoes next time to help get around once on the ice.
I looked on the map and there's another walk in access east of the dam through the trees. The parking for that is off a right hand turn on 9C prior to heading straight west on the road 4 to the dam. Check google map or earth. With a sled you can also continue across the dam on 4 but no go with my very capable truck. They don't plow it but there's no gate (if I remember correctly).
I caught fish right away and ended up with 2 10" lakers, 3 small brooks, and about 6 8-12" rainbows. I only stayed for around 1 hour so the action was good but no size. I fished 25 - 50fow right on the dam to just out from it. I'd like to get back up there to explore it more but only with a group, with snowshoes, and/or with sleds!
Good luck if you go and tell us how you do!
