Iowa DNR
Iowa DNR Fishkill Database
The Iowa DNR Fishkill Database stores the data for all fish kills in the state from 1995 to the present. 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 fishkills. A fishkill 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.

Recent Additions
Unnamed Tributary to Little Maquoketa River - 3/25/2019 - Animal Waste
over a month ago
Unnamed Tributary to Floyd River - 5/31/2018 - Ammonia/Fertilizer
over a month ago
Mississippi River - 5/30/2018 - Environmental
over a month ago
Stormwater Containment Structure - 6/16/2017 - Environmental
over a month ago
Unnamed Tributary to Wapsipinicon River - 9/28/2016 - Animal Waste
over a month ago
Winnebago River - 7/16/2008 - Environmental
over a month ago
Unnamed Tributary to North Fork Floyd River - 7/16/2008 - Pesticides/Herbicides
over a month ago
Private Pond - 9/19/2007 - Unknown - Natural Suspected
over a month ago
West Branch Little Floyd River - 8/19/2007 - Animal Waste
over a month ago
Private Lake - 8/6/2007 - Unknown
over a month ago
Unnamed Lake - 3/22/2007 - Environmental
over a month ago
Private Pond - 6/24/2015 - Environmental
2 months ago
Private Pond - 9/8/2018 - Environmental
2 months ago
Little Wapsipinicon River - 8/5/2006 - Unknown
2 months ago
Unnamed Creek and Private Gravel Pit - 9/20/2004 - Animal Waste
2 months ago
West Branch Floyd River - 8/10/2016 - Unknown
2 months ago
Soap Creek - 4/23/2004 - Petroleum Products
2 months ago
Chariton River - 3/4/2018 - Gas Bubble Disease
2 months ago
McLoud Run - 3/21/2018 - Environmental
2 months ago
Whitewater Creek - 5/3/2018 - Unknown - Anthropogenic Suspected
2 months ago
Unnamed Tributary to Feddeke Creek - 11/6/2017 - Animal Waste
2 months ago
Unnamed Tributary to Pine Hollow Creek - 7/5/2017 - Animal Waste
2 months ago
UT West Fork Floyd River - 7/27/2017 - Pesticides/Herbicides
2 months ago
Silver Lake - 7/22/2017 - Cyanobacteria Bloom
2 months ago
McLoud Run - 7/31/2017 - Chlorinated Water
2 months ago
Des Moines River - 8/4/2017 - Disease/Parasite/Stress
2 months ago
Linn Creek - 8/9/2017 - Environmental
2 months ago
Big Creek Lake - 8/25/2017 - Disease/Parasite/Stress
2 months ago
Great Western Park Pond - 8/5/2017 - Unknown
2 months ago
Unnamed Tributary to Hickory Creek - 10/9/2017 - Animal Waste
2 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 IDNR'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.