Officials from the Iowa Department of Natural Resources are keeping a close eye on a northwest Iowa creek near Inwood to see if fish are killed after thousands of gallons of cow manure ended up in the waterway.
Officials say they received a call Thursday from a farmer indicating manure was flowing through his pond.
DNR officers say John Fluit Jr. had dumped manure from a basin at his 4,000-head cattle operation onto a cornfield. It's estimated as much as 12 loads of manure each up to 4,000 gallons were dumped on the field.
It flowed into a creek and ran for a mile before entering the neighbor's pond then back into the creek.
The DNR says no dead fish have been found but they're monitoring high ammonia levels.