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The rockslide came off a cliff above the head scarp of the landslide and blocked and backed up flow in an irrigation ditch. The backed-up water soaking the ground along with rainfall and snow melt and the additional weight of the rock and water at the top of the slide was enough to cause the massive ground failure and movement of the Colbran slide. The 3 ranchers that were buried in the landslide had gone up to inspect where the irrigation ditch was blocked.
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