Fortress Lake is located behind Fortress Ski Resort. At the time of my visit the road leading to the Resort was closed due to bridge problems. It has been this way for a couple of years. This means getting to the lake takes allot more effort as you either have to walk or bike the road to the Resort. From the resort you have to hike over two of the ski hills to get to the lake. The lake itself is a nice blue and is very clear.