<sod >Scroll down for video  Officials say water falling over the Oroville Dam's emergency spillway has stopped as Oroville lake levels dropped low enough  A massive hole is causing major erosion around the Oroville Dam in California.< eod>< sod > Scroll down for video  Officials say water falling over the Oroville Dam's emergency spillway has stopped as Oroville lake levels dropped low enough The evacuation was ordered Sunday afternoon after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour.< eod>