Biologists from the Iowa Department of Natural Resources (DNR) are investigating a large fish kill in O'Brien County that was discovered on Tuesday. According to the DNR, the incident was caused by a manure spill from Summit Dairy near Mill Creek in the upper Mississippi River. Officials confirmed that the fish kill has spread 12 miles to the edge of Cherokee County and is reportedly one of the largest Iowa fish kills in recent memory. “The runoff caused an elevated level of ammonia and lowered dissolved oxygen in the creek,” said DNR environmental specialist Tom Roos in a
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