USGS 05587450 Mississippi River at Grafton, IL

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DESCRIPTION:: Latitude 38°58'04.7", Longitude 90°25'44.4" NAD83; Jersey County, Illinois, Hydrologic Unit 07110009; Drainage area: 171,300 square miles; Datum of gage: 403.32 feet above NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations (availability statement)	2007-10-01	2025-07-01
Daily Data
Discharge, cubic feet per second	1933-04-01	2025-06-30	32994
Gage height, feet	1986-11-14	2025-07-01	13968
Daily Statistics
Discharge, cubic feet per second	1933-04-01	2024-12-02	32785
Monthly Statistics
Discharge, cubic feet per second	1933-04	2024-12
Annual Statistics
Discharge, cubic feet per second	1933	2025
Peak streamflow	1844-06	2024-07-10	39
Field measurements	1988-02-19	2025-05-21	459
Field/Lab water-quality samples	1991-07-18	2011-06-08	4
Water-Year Summary	2006	2024	19
Revisions	Loading...

OPERATION:: Record for this site is maintained by the USGS Missouri Water Science Center; Email questions about this site to Missouri Water Science Center Water-Data Inquiries

U.S. Department of the Interior | U.S. Geological Survey
Title: NWIS Site Information for USA: Site Inventory
URL: https://nwis.waterdata.usgs.gov/nwis/inventory?

Page Contact Information: Missouri Water Data Support Team
Page Last Modified: 2025-07-01 18:11:25 EDT
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