Napa to the Shores of Lake Berryessa - By Guest

The road leading up to the lake is well-paved, with some awesome tight corners. I went early so as not to hit traffic. I ended up going all the way to Clear Lake. The road quality degrades severely (floods during rain season and potholes created from frost in winter) after Lake Berryessa. Also, be sure to keep tabs on your gas, as I didn't see a place to fill up between the south end of Lake Berryessa and Lower Lake.