An incident in which numerous fish were killed in a Clayton County stream is under investigation.

The Iowa Department of Natural Resources initially received a report of a fish kill on Bloody Run Creek, Saturday evening (April 18).

DNR officers were called out to investigate, starting at Spook Cave, which is 7 miles west of Marquette, and found a number of dead fish along a 3 mile stretch downstream to Iris Avenue.

The DNR is doing a fish kill count, from Spook Cave downstream, past Iris Avenue, north of Giard.

Authorities have not yet found the source of the pollution, and have not identified the substance that caused the fish kill.

Speculation that a traffic accident Saturday night 3 miles west of McGregor in which there was a diesel fuel spill was the cause, but the accident happened downriver from the fish kill area, and was ruled out.


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