188,000 residents asked to evacuate

> Tens of thousands of Californians face indefinite stay in shelters as engineers worked for a second day to fix the United States’ tallest dam > More rain was forecast for as early as Wednesday and through Sunday. > Crews were working to shore up an overflow channel > Authorities gave no indication of when it would be safe for people to go home. > They say they had averted the immediate danger of a catastrophic failure at the dam that could unleash a wall of water . > Governor Jerry Brown sent a letter to US President Trump asking him to issue an emergency declaration, which would open up federal assistance.