USGS 05558300 ILLINOIS RIVER AT HENRY, IL

PROVISIONAL DATA SUBJECT TO REVISION

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This site is operated in cooperation with the

Cooperator logo U.S. Army Corps of Engineers
Rock Island District - Rock Island, Illinois

and

Cooperator logo Illinois Environmental Protection Agency




NWS River Forecasts
This station managed by the Urbana Field Office.

Available Parameters Available Period
  
2018-06-06  2026-05-19
1990-08-30  2026-05-19
2007-10-01  2026-05-19
2018-06-06  2026-05-19
2018-06-06  2026-05-19
2026-01-19  2026-05-19
2018-06-06  2026-05-19
2018-06-06  2026-05-19
2020-10-28  2026-05-19
2022-08-03  2026-05-19
2007-10-01  2026-05-19
2026-04-23  2026-05-19







 (7)
 
  -- or --

 

 
Summary of all available data for this site
Instantaneous-data availability statement

Temperature, water, degrees Celsius, YSI
Most recent instantaneous value: 21.6 05-19-2026   16:45 CST
Graph of Temperature, water, degrees Celsius

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Discharge, cubic feet per second
Most recent instantaneous value: 13000 05-19-2026   16:45 CST
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for May 19 based on 44 water years of record more
Min
(2025)		 25th
percen-
tile		 Most Recent
Instantaneous
Value May 19		 Median Mean 75th
percen-
tile		 Max
(2020)
6140 11900 13000 20100 22100 26000 109000

Gage height, feet
Most recent instantaneous value: 15.43 05-19-2026   16:45 CST
Graph of Gage height, feet

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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, YSI
Most recent instantaneous value: 818 05-19-2026   16:45 CST
Graph of Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

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Dissolved oxygen, water, unfiltered, milligrams per liter, YSI
Most recent instantaneous value: 9.7 05-19-2026   16:45 CST
Graph of Dissolved oxygen, water, unfiltered, milligrams per liter

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Dissolved oxygen, water, unfiltered, percent of saturation, YSI
Most recent instantaneous value: 11 05-19-2026   16:45 CST
Graph of Dissolved oxygen, water, unfiltered, percent of saturation

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pH, water, unfiltered, field, standard units, YSI
Most recent instantaneous value: 8.4 05-19-2026   16:45 CST
Graph of pH, water, unfiltered, field, standard units

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Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll, YSI
Most recent instantaneous value: 41.82 05-19-2026   16:45 CST
Graph of Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll

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Phycocyanin fluorescence (fPC), water, in situ, concentration estimated from reference material, micrograms per liter as phycocyanin, YSI
Most recent instantaneous value: 2.17 05-19-2026   16:45 CST
Graph of Phycocyanin fluorescence (fPC), water, in situ, concentration estimated from reference material, micrograms per liter as phycocyanin

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Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), YSI
Most recent instantaneous value: 52.6 05-19-2026   16:45 CST
Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)

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Water velocity reading from field sensor, feet per second
Most recent instantaneous value: 1.70 05-19-2026   16:45 CST
Graph of Water velocity reading from field sensor, feet per second

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