Lake Oroville will partially reopen on Thursday, nearly two weeks after more than 180,000 Northern California residents evacuated their homes and the lake area closed due to fears that the emergency spillway at Oroville Dam could fail. California State Parks closed the state recreation area, with the exception of the visitor center and north and south forebays, on Feb. 13 to avoid any interference as crews worked to strengthen the dam’s emergency spillway and remove debris from below the main spillway. Campgrounds were also closed to accommodate other agencies involved in the spillway work.