Fern Ridge, a flood control reservoir, is not at full capacity in this scene. The Corps of Engineers needs extra capacity to catch any sudden snowmelt that could overwhelm the reservoir. Compare this view, taken January 2006, with the following image photographed September 2005.
I'm in the middle of the "lake"! It is extremely unusual to see the reservoir without water. The water was drained so repairs could be made to the dam. It is possible that this will NOT be experienced again in a lifetime!