It is part of the Columbia River basin. There is a dam on the east end of the Lake. The active capacity is 157,900 acre feet, but when it is dried up it is nothing but tree stumps. There is camping and boat ramps.
I was there in mid may and the temp was 60 degrees and sunny with some snow still in areas. The next week, the lake was flooded from snow run off and you couldnt get to where I had taken the pictures from. What your essential gear is depends on how bad/good the winter season is and how long it decides to hang around.