Rising floodwaters have triggered actions to protect the city of Sacramento. For the first time in a decade, the floodgates of the Sacramento River will be opened Monday morning, releasing a wall of water downstream into the Yolo Bypass. The National Weather Service warned farmers in the river valley region to have livestock and farm equipment moved out of the way. The California Department of Water Resources last opened the gates of the manually operated weir, built in 1916, in 2005.