( CNN ) -- The sights and sounds of rocks rolling down mountainsides are common but still captivating phenomena for the residents of the Nile Valley in central Washington state . The landslide covered up to a half-mile of Washington state Route 410 with rock up to 30 feet deep . `` Every morning I hear big rocks coming down , '' said longtime valley resident Frank Koch . But a landslide over the weekend was more than Koch and the other 1,500 people in the Nile Valley bargained for . `` We just had the whole face of the mountain just pretty much come off , '' said Valerie Royster , manager of the Woodshed Restaurant , which sits just across the road from the edge of the landslide . The slide covered a quarter-mile to half-mile of State Route 410 , which connects Yakima with Mount Rainier National Park , with rock up to 30 feet deep , said Washington state Department of Transportation spokesman Mike Westbay . Westbay said 25 homes had been affected by flooding and five by the landslide itself , including a mobile home that was demolished . See how slide blocked roads , moved homes » . Damage was estimated at $ 20 million , but that would likely increase , said Jim Hall , director of emergency management for Yakima County . Watch aerial shots of landslide area » . `` My bet is it 's probably going to be a lot more than that , ' Hall said . Roads would needed to be rebuilt or rerouted , he said , and tons and tons of rock and debris moved . iReport.com : Are you there ? Share your photos , videos . The mountain 's movement attracted dozens of residents to the parking lot of the Woodshed , which Royster calls the hub of the community , on Sunday morning to take in the spectacle . `` It was a slow slide , '' she told CNN by telephone Monday morning , which meant residents had enough warning to get out of their homes and to the Woodshed 's parking lot to watch nature 's majesty and fury . `` It was very loud . You could watch trees coming down '' as the slide pushed the rocks in the valley 's riverbed 30 to 40 feet up the opposite bank , Royster said . Afterward , residents found river fish high and dry on the hillside , she said . Westbay said the slide was like nothing the state has seen before , in that it was n't the result of a weather or seismic event . `` We 've had rockslides , mudslides , avalanches , but nothing like this , '' he said . Geologists were calling it a `` natural land movement , '' he said . Westbay said the rocks had stabilized by Tuesday morning , and crews had begun work on a temporary gravel road to restore access to residents . Flooding was the biggest obstacle to that ; the slide changed the course of the Naches River , he said . For all the spectacle of the weekend , local resident Koch was impressed by something else Tuesday morning -- the government response . `` They 're out there kicking bootie today , '' he said of the repair crews . `` It 's pretty amazing to see government moving that fast . ''
Landslide covers half-mile of highway up to 30 feet deep . Damage estimated upwards of $ 20 million in Yakima County , Washington . Slide changed course of Naches River . `` They 're out there kicking bootie , '' resident says of government response .