Its a hard thing to do. This is the cbs evening news with scott pelley. Pelley this is our western edition. Have no idea when theyll be allowed to go home. They were evacuated yesterday over concern that recent rain could cause a spillway to fail, at the nations tallest dam. Three counties town three counties down stream could be inundated, and John Blackstone is there. Reporter with water thundering out of oroville dam, officials are in a race to fix the damaged spillway and lower the lake level, which is at near capacity. Enlifornia department of Water Resources director bill croyle. Were moving 100,000 cubic feet per second down that spillway. Weve been doing that for about 16 or 17 hours. Reporter as the water pours out, crews are preparing to move huge boulders to fortify the dams spillways. Mainmain concrete spillway that funnels excess water into a floodplain began breaking apart last week. Chunks of concrete gave way, and the hole kept getting bigger. Engineers decided to use a