SAN FRANCISCO (AP) – Water flows into Lake Oroville are picking up as rain hammers Northern California and state officials warn they may have to use a partially rebuilt spillway at the troubled dam. Feather River flows into the lake began exceeding water being released around noon on Friday. The lake level rose slightly but was still around 793 feet (242 meters) California Department of Water Resources officials say they’ll use the main spillway if the water level reaches 830 feet (253 meters) but they hope to avoid it. The spillway was destroyed last year during a crisis that forced the evacuation of downstream towns amid fears of catastrophic flooding. About a third of it has been fully rebuilt with reinforced structural concrete but the rest has temporary repairs. State officials say it’s safe to use if needed.