Iowa Dairy Manure Spill Kills Over 100,000 Fishes in Winneshiek County

A dairy manure spill from the Dale Humpal Dairy in Iowa resulted in the deaths of over 100,000 fishes along a 10.2-mile stretch of Dry Run Creek, marking one of the largest fish kills in the state in the past decade. The spill was traced back to a faulty manure control structure at the farm, which allowed manure-laden runoff to flow directly into the creek. Water tests revealed lethal ammonia levels, confirming the manure as the cause of the fish deaths. The incident highlights the environmental consequences of intensive animal agriculture, with manure spills in Iowa previously leading to the deaths of nearly two million fishes between 2013 and 2023.

The scale of the fish kill, with an estimated 126,000 individuals of various species, underlines the impact of such incidents on the environment. The incident also sheds light on the need for stricter regulations and oversight in the dairy industry to prevent such spills from occurring in the future.