Lead Mine Road connects the quiet south side of Silver Lake (the paved East Shore Drive) to the quiet the paved roads around Madison. It's a wide and hard packed dirt road which winds through Town Forest, and then through woods dotted with isolated houses. You can rip through this on a gravel bike or MTB, or road bike if you're careful and have 25 plus tyres.
There's a climb towards the east side which isn't too bad, but also a beautiful stretch that is lined with pine trees standing to attention as you pass.
In the winter, the road is not cleared, and will be fine for fat bikes or MTB. I've been through on my CX bike on the frozen snow was frozen, so I had good traction.