Iowa DNR
Iowa DNR Fish Kill Database
The Iowa DNR Fish Kill Database stores the data for fish kills in the state. The primary function of this database application is to track causes and locations of fish kills for the purposes of assessing Iowa's water quality.

The Integrated Report, which combines federal requirements for state Section 305(b) water quality assessments and Section 303(d) impaired waters listings, required the Iowa Department of Natural Resources Watershed Monitoring and Assessment Section to begin tracking fish kills. A fish kill can affect the 305(b) water quality assessment of the waterbody and can potentially result in the addition of the water body to the 303(d) list of impaired waters.

Fish Kill Reporting

If you believe a fish kill has occurred, immediately contact the nearest Iowa DNR Field Office or Fisheries Office.

You should have available the name of the stream, the location of the kill, and any other conditions or observations that may aid in the investigation of the cause and source of the kill.

Do not touch the water or remove any dead fish.


24-hour Environmental Reporting Hotline

Recent Additions
Dry Branch Creek - 7/9/2021 - Other Chemical/Pollutant
Crystal Lake - 7/1/2021 - Environmental
last week
Drainage Ditch 177 - 5/1/2020 - Unknown - Anthropogenic Suspected
2 months ago
Interstate Park Pond - 2/16/2021 - Environmental
2 months ago
Black Pit - 2/15/2021 - Environmental
2 months ago
Plum Creek Pit - 2/15/2021 - Environmental
2 months ago
Lotts Creek - 4/14/2021 - Animal Waste
3 months ago
Roberts Creek - 7/18/2020 - Ammonia/Fertilizer
8 months ago
Unnamed Tributary to Brush Creek - 11/2/2020 - Ammonia/Fertilizer
8 months ago
Little Wapsipinicon River - 9/8/2020 - Unknown - Anthropogenic Suspected
9 months ago
Tributary to Crane Creek - 9/14/2020 - Environmental
10 months ago
Unnamed Tributary to Rock Creek - 9/1/2020 - Environmental
10 months ago
Lake Red Rock - 8/26/2020 - Unknown - Natural Suspected
11 months ago
Unnamed Tributary to Fourmile Creek - 8/13/2020 - Organic Material
11 months ago
Unnamed Tributary to Bohemian Creek - 7/22/2020 - Unknown - Anthropogenic Suspected
11 months ago
Unnamed Tributary to Paint Creek - 7/20/2020 - Wastewater
11 months ago
Wetland Area north of John Deere Dubuque - 7/28/2020 - Environmental
11 months ago
Buck Creek - 7/23/2020 - Unknown - Anthropogenic Suspected
11 months ago
Spirit Lake - 6/16/2020 - Unknown - Natural Suspected
13 months ago
East Okoboji Lake and Lower Lake Chain - 6/3/2020 - Disease/Parasite/Stress
13 months ago
West Okoboji Lake - 6/5/2020 - Unknown - Natural Suspected
13 months ago
Unnamed Tributary to Little Cedar River - 4/23/2020 - Animal Waste
14 months ago
Bloody Run Creek - 4/20/2020 - Unknown
15 months ago
Spencer Creek - 7/6/2018 - Unknown
16 months ago
Spirit Lake - 8/13/2018 - Cyanobacteria Bloom
16 months ago
Floyd River - 8/18/2018 - Unknown
16 months ago
Richmond Springs and Fenchel creek - 9/28/2019 - Unknown - Anthropogenic Suspected
21 months ago
Unnamed Tributary to Burr Oak Creek - 9/17/2019 - Unknown
22 months ago
Little Bear Creek - 9/11/2019 - Animal Waste
22 months ago
Hardin Creek - 8/18/2019 - Unknown
23 months ago

Fish Kills and Water Quality Assessments

As described in Iowa DNR's current methodology for water quality assessments, occurrence of a single pollutant-caused fish kill, or a fish kill of unknown origin, on a waterbody or portion of a waterbody during the most recent three-year period indicates an impairment of the aquatic life uses.

Each report of a fish kill will be reviewed to determine whether development of a TMDL is appropriate. In the absence of an ongoing source of a pollutant, TMDLs will not be developed for kills caused by a one-time illegal or unauthorized release of manure or other toxic substance. Impacts from this type of fish kill are addressed through IADNR's enforcement procedures. Fish kills attributed to authorized discharges (i.e., a discharge meeting permit limits) are considered for Section 303(d) listing as the existing, required pollution control measures are not adequate to address this impairment.