The Iowa Department of Natural Resources is investigating a manure discharge from a cattle operation in northern Cherokee County.
The DNR says it received multiple complaints on Friday.
DNR staff confirmed that manure runoff from the Tentinger Feedlot is reaching a tributary of Bear Creek about 4 miles northeast of Cleghorn.
DNR staff is working with the owner to stop the discharge.
The investigation is ongoing, but DNR staff think runoff from recently land-applied manure is responsible.
They did not see any fish in the stream-either dead or alive.
The DNR will consider appropriate enforcement action.
