Over 77,000 gallons of beer was accidentally spilled into a creek at the weekend, killing thousands of fish.A spokeswoman at Coors Brewing Company, based in the US, said an employee triggered the wrong switch and the beer, which was in fermenting tanks, got washed through a wastewater treatment plant and then into Clear Creek.Health officials have warned residents to avoid the creek south of the brewery, because of a small bacterial risk that could cause illness, if the water was consumed.