According to Wikipedia, this is a dry lakebed. A volcano erupted when it was still a lake. The molten rock solidified when it hit the lake bottom mud and created this stone ring. The lake dried out and the mud all washed away over time leaving this stone ring that resembles the walls of a fort thus 'Fort Rock'
An old buddy of mine was working at a power substation out here, and I was going to meet him for lunch but the wind was howling so much he never heard his phone ring so I missed out meeting up with him.
Now at this point, I was going to cut off at Summer lake down E Bay Rd and onto some forestry roads and come out near the Cali border, but a local told me there was still about 6 ft of snow up there, so I stuck to the hiway.
It was still a mighty pretty ride down through Central Oregon.
And I ended up in Lakeview Or. my first night.