Northern California is on track to break rainfall records. Water has gushed through a weir into the Yolo Bypass floodplain at levels not seen in more than a decade. The Sierra Nevada snowpack is nearly double historical averages. But you wouldn’t know the region has experienced an exceptionally wet winter looking at the steep, dry shores ringing the Sacramento region’s largest reservoir, Folsom Lake. On Wednesday, the lake was filled to just 41 percent capacity – 80 percent of its historical average.