The DNR’s geographic services develop maps ranging from locations of known confinement feeding operations to vulnerability to pollution from surface contaminants. Maps can also be used to locate well drilling logs, counties requiring the master matrix for construction permits or watersheds that have impaired waters. Other maps can provide insight into conservation or watershed planning, as well as information on everything from manure spills to alluvial soils. Check out the sites below for information specific to animal feeding operations. Then try Mapping (GIS Interactive) and Geology on the DNR homepage for everything from 2002 color infrared aerial photography to topographic maps.
The AFO Siting Atlas
can be used to determine if a potential building or expansion location is in karst terrain or alluvial soils, or near a major water source. Instructions for using the site are available.
Counties using Master Matrix
DNR’s Interactive Mapping Website
This site has interactive maps that provide a way to readily obtain information and Geographic Information Systems (GIS) data without having specialized GIS software. Map coverages include the 2002 color infrared air photography, soil erodibility, corn suitability ratings, land cover, etc.
DNR’s Geographic Information Systems Library (requires GIS software)
This site requires the use of GIS software and is for downloading data files from the GIS library
on the web. Its purpose is to allow GIS users to download data files and save them to a location on their computer. Then the file can be opened using ArcView. The files do not open directly from the site.
Additional Links to Geographic Information Systems – GIS
This site provided by Iowa State University for free access to Iowa geographic map data
through an on-line map viewer, ArcIMS map services, or through GIS software extensions.
Animal Feeding Operation Maps
The DNR map files listed below show data information from location of permitted sites to impaired waters.
Note: The following map files have been offered in three formats:
All Maps - Low-Resolution
- Low-resolution: These maps are lower quality, but they will download faster than the high-resolution maps.
- High-resolution: These are high quality maps, but they are large files and may cause problems when downloading.
- .zip files: These include all maps of a chosen resolution.
All Maps - High-Resolution (*.zip file) Size: 11,358KB
Animal Feeding Operations In Iowa
This map shows known animal feeding operations in Iowa greater than 200,000 lbs. live weight. They are broken out into permitted facilities – those with a construction permit; non-permitted facilities – those facilities required to submit a manure management plan exclusive of those with a construction permit; and registered open feedlots. Low-Res
Size: 197KB High-Res
Animal Feeding Operations in Iowa and Groundwater Vulnerability - Aquifers and Wells
The animal feeding operations are laid over groundwater vulnerability regions. The correspondence between the feeding operations and aquifers or wells is visible. The various background colors indicate the level of vulnerability to pollution from surface contaminants. Low-Res
Size: 231KB High-Res
Animal Feeding Operations in Iowa and Groundwater Vulnerability - Special Areas
Animal feeding operations are here shown against locations of sinkholes and agricultural drainage wells. Because sinkholes and drainage wells are more direct conduits to groundwater, surface pollutants may reach groundwater more rapidly and at higher concentrations. Low-Res
Size: 223KB High-Res
Animal Feeding Operations in Iowa and Distribution of Reported Manure Spills
The animal feeding operations are here shown in conjunction with human-caused spills. The spills are broken down by type, and manure spills for the 2000-2001 period are shown with circles of increasing size to indicate the number of spills at a location. The insets show a 3.5 mile radius around fishkill locations. These illustrate the relationship between AFOs, human-caused spills, and fishkills. Low-Res
Size: 223KB High-Res
Animal Feeding Operations in Iowa and Impaired Waters (TMDL Program)
This map was designed to show the distribution of animal feeding operation and human-caused spills among impaired watersheds (as designated by the Total Daily Maximum Load program). A discussion of the watershed boundaries is included on the map. Low-Res
Size: 269KB High-Res
Animal Confinements in Iowa by Number of Animal Units
This image shows the locations of known confinement feeding operations by the size of operation measured in animal units. Animal units are determined by multiplying a factor times the number of animals. For example, the factor is 1 for beef cattle and immature dairy cattle, so a confinement with 500 beef cattle would have 500 animal units. The factor is 0.4 for swine that weigh more than 55 pounds, so a confinement with 4,000 finishing swine would have 1600 animal units. Turkeys weighing less than 7 pounds have a factor of 0.0085, so 100,000 turkeys would have 850 animal units. Low-Res
Animal Feeding Operations in Iowa and Reported Fish Kills Attributed to Human Causes
In this map, the distribution of AFOs and fishkills is shown on the largest map with a 3.5 mile radius around human-caused fishkills. The percentage of the total number of fish killed between January 1981 and November 2001 attributed to certain causes is broken out in an inset. According to records kept by the DNR, the number of fish killed for the stated period as a result of manure spills is far higher than any other category (61%). Low-Res
Size: 257KB High-Res
Non-Permitted Animal Feeding Operations in Iowa
This image shows the locations of known animal feeding operations required to submit manure management plans to the DNR, exclusive of permitted operations. A confinement is required to submit a manure management plan if it has a live weight over 200,000 pounds. The data is current as of December, 2001. Low-Res
Permitted Animal Feeding Operations in Iowa
In this image, the locations of those animal feeding operations requiring a permit are shown. Facilities requiring a permit are those with certain waste control structures, and those over a designated live weight. The data is current as of April 2001. Low-Res
Registered Feedlots in Iowa
Those feedlots registered with the DNR are shown here. To date, this has been a voluntary process, so the distribution does not reflect the complete distribution of feedlots. The data is current as of June 2001. Low-Res