Yes, definitely go. Highway 62 from the south is open and kept plowed. Check your route and the website.
We went for the morning two days ago, and took numerous photos of the lake. Stunning! The snow on the ground adds a lot of beauty.
It was foggy driving up but the sun gradually broke through. By noon, we had gorgeous sunshine. You can see the lake behind the lodge and can drive a short stretch of the rim which the rangers keep open, park, and see the lake and island. It was chilly but beautiful.
The visitor's center is open (side entrance -the front is behind a huge snowbank), where we watched the good, brief film. We stopped for coffee and hot chocolate in the historic lodge (fireplace going - great atmosphere!) and returned there later for lunch. I can recommend the chowder with salad combo.