Illinois Natural History Survey Aerial Waterfowl Inventory Data

Emiquon area continues to post impressive aerial waterfowl count numbers!

The Illinois Natural History Survey has been conducting waterfowl aerial inventories since 1948.  Approximately 214 miles of the Illinois River, from Spring Valley to Grafton, and 272 miles of the central Mississippi River, from Alton to Moline, are aerially inventoried for waterfowl weekly from September through early January.

The purpose of these aerial inventories is not to acquire complete counts of waterfowl numbers within specific geographic areas but to estimate the number of each species in order to provide an index of temporal changes within and among years and to document the distribution of the species throughout the monitored regions. Because of the efforts of the INHS with the long-term support of the Illinois Department of Natural Resources, the annual inventory data on numbers and distribution of migratory waterfowl in Illinois is unequaled.

The INHS inventories 20 locations on the Illinois River and 15 locations on the central Mississippi River weekly. Flights are generally scheduled for each Monday beginning in early September and once a flight is completed, results are posted as soon as possible.

Click here to go directly to the detailed species count inventories posted in the INHS Aerial Inventory Database.


INHS Aerial Survey Dates

Click on a date below to see how the Emiquon area waterfowl counts compare to the other regions surveyed.