21st century wire say oroville dam northern california sustain sink hole damage main spillway 188,000 residents local area tell evacuate helicopters drop rock areas erosion try prevent grind erode downstream primary never use secondary passive spillways dam.abc10 note late last week amount water oroville dam challenge design dam due sink hole form spillway require outflow slow 185,000 cubic feet water per second come dam 41,000 go out.there passive spillway force use water level rise rain expect late week unknown stream effect auxiliary spillway never use potential cause lot damage spill downstream feather river towards residential areas report indicate increase outgo water main spillway lessen potential damage use passive spillway.join abc10 live update ongoing report develop situation oroville dam abc 10at least 188,000 people live downstream california oroville dam order evacuate late sunday officials say emergency spillway dangerously erode failure could cause uncontrolled floodwaters pour lake.water begin flow emergency spillway oroville dam northern california saturday first time nearly 50-year history heavy rainfall.evacuation order still place work keep update everyone safe https //t.co/xjygk6b8vf yuba county yubacounty february 13 2017crews hard work reinforce integrity levee adjacent tyler island stay tune social media continue update pic.twitter.com/6uigibcjwm sacramentooes sacramentooes february 13 2017the paradise alliance church long accept new evacuees seek shelter visit https //t.co/zmtlivt9ta update list butte county ca countyofbutte february 13 2017butte county offices oroville area remain close tomorrow due orovillespillway evacuations buttesheriff ca_dwr butte county ca countyofbutte february 13 2017continue develop story live update abc10read us news 21st century wire us filessupport work subscribe become member 21wire.tv lake oroville dam spillway damage result evacuation order 188,000 people