Fish Kill Event - Shell Rock River

Shell Rock River from the Marble Rock Impoundment in Floyd County to above Clarksville in Butler County

Event ID: 848
Date of Kill: 8/16/2011
Waterbody Type: River/Stream
Cause Origin: Natural
Cause: Environmental
Mode: N/A
Magnitude: 1 (1 - 100 fish killed)
Kill Length: 18.00 miles
County: Floyd
ESD Field Office: FO 2
Fisheries Office: Decorah State Hatchery
LongDD: -92.87104
LatDD: 42.96512
Created Date: 5/22/2013 10:14:00 AM
Last Update: 2/19/2019 1:48:01 PM

For more information about this fish kill event, contact the Field Office or Fisheries Office listed above.

Impacted Assessment Segments

Lat/Long uses WGS84 datum

Highlighted river segments indicate those impacted in part or whole by this fish kill event. It is not meant to represent the actual extent of the kill.

Onsite Comments

Natural kill caused by several weeks of extremely hot water temperatures, little rainfall, a moderate green algae bloom and low flow conditions on the river and is only affecting channel catfish with the majority of dead fish in the 9-13 inch range.