Water is starting to seep down the rebuilt Oroville Dam spillway. California Department of Water Resources officials said Wednesday this is common and will not affect the operation of the dam’s gates, which are not watertight. “Once the lake reaches or exceeds the elevation of the entrance gates (813 feet) a small amount of water is expected to seep through the gates as they are not watertight,” water resources spokeswoman Erin Mellon said. “This is common and does not affect the operation of the gates nor the spillway.”