Doon, IA (KICD) — The DNR investigates a fish kill on the Little Rock River east of Doon.
On Monday, a concerned citizen reported the fish kill to DNR. When environmental specialists arrived at the river, they found high levels of ammonia, odor and color indicating manure-laden water killed the fish.
They traced the runoff to two open feedlots north and east of Doon belonging to Jim Koedam and Marvin VanMaanen. Both producers raise beef cattle.
The area received about two inches of rain Saturday night. The preliminary investigation indicates manure-laden runoff ran overland and then into draws that flow to the river.
DNR staff found dead fish along a two-mile section of stream starting about 1.5 miles north of the Highway 75 bridge. The dead fish included many smallmouth bass and channel catfish, along with carp, suckers, largemouth bass, gar, chubs and minnows.
DNR fisheries specialists were on site Tuesday conducting a fish count. The DNR will continue to monitor the clean up and consider appropriate enforcement action.