Fish Kill Event - Unnamed Tributary to Rock Creek
SW of Osage
- Event ID
- 1003
- Date of Kill
- 9/1/2020
- Waterbody Type
- River/Stream
- Cause Origin
- Natural
- Cause
- Environmental
- Mode
- N/A
- Magnitude
- 2 (101 - 1000 fish killed)
- Kill Length
- 1.00 miles
- County
- Mitchell
- ESD Field Office
- FO 2
- Fisheries Office
- Decorah State Hatchery
- LongDD
- -92.94515
- LatDD
- 43.25841
- Created Date
- 9/8/2020 9:07:56 AM
- Last Update
- 1/6/2022 2:27:42 PM
A fish kill of more than 100 fish was reported this morning southwest of Osage in Mitchell County. The kill had actually first been observed on Tuesday this week. The location was along 340th Street from approximately Dancer Avenue to Echo Avenue (1 mile) in an unnamed tributary of Rock Creek. The incident was investigated today and determined to be from natural causes. Low Dissolved Oxygen levels (1.0 ppm) were found at this stretch of stream, which also had low flows and decomposition of organic matter occurring. No other contaminants were found in the water or other potential sources identified. There were also live fish seen in the stream, however it was apparent some were still being impacted by the low oxygen levels. These conditions are likely to continue until flows increase. There were no impacts observed to the receiving water, Rock Creek.