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USGS Daily Statistics for Illinois

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 05558300 ILLINOIS RIVER AT HENRY, IL


Marshall County, Illinois
Hydrologic Unit Code 07130001
Latitude  41°06'26.2", Longitude  89°21'22.4" NAD83
Drainage area 13,544  square miles
Gage datum 425.85 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1981-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 16,200 14,100 22,600 22,100 24,300 21,500 17,400 10,400 9,320 8,820 12,300 13,900
2 15,900 14,100 22,300 22,900 25,700 21,500 16,900 9,700 9,030 8,300 12,400 14,500
3 15,500 14,500 21,800 23,200 25,200 21,000 16,300 9,590 9,350 8,330 12,100 14,800
4 14,800 14,600 21,600 23,300 23,800 20,000 16,300 9,560 9,160 9,230 11,600 15,000
5 15,400 14,500 22,400 22,900 22,300 19,200 15,500 9,920 8,710 9,110 11,500 14,800
6 15,800 14,500 22,300 22,400 20,800 18,900 14,900 9,830 8,350 9,090 11,500 15,200
7 15,300 14,800 21,500 22,600 20,700 18,300 14,500 9,340 8,170 8,970 11,400 14,800
8 14,500 14,700 21,600 22,400 20,800 17,900 14,100 8,990 8,780 8,730 11,000 14,700
9 14,500 15,000 22,300 21,900 21,800 17,900 13,400 9,040 8,900 8,770 10,800 14,300
10 15,200 15,000 23,200 21,800 22,500 18,600 13,200 8,950 8,950 8,480 10,700 14,200
11 15,200 15,100 24,900 21,900 22,700 19,000 13,400 8,740 9,700 8,170 10,900 14,000
12 15,400 15,400 25,100 21,500 22,900 19,000 13,500 8,410 9,380 8,290 10,800 13,900
13 15,200 15,000 24,600 22,100 23,300 18,500 13,800 8,420 9,760 8,360 11,000 14,500
14 15,800 14,700 24,200 21,600 23,800 19,000 14,000 8,260 10,600 8,850 11,000 14,000
15 16,100 15,000 24,900 21,900 24,200 19,200 13,800 8,310 11,300 9,300 10,700 14,200
16 15,700 15,400 24,500 22,700 23,700 19,300 13,200 8,110 11,600 9,660 10,600 14,500
17 15,200 15,300 23,800 23,100 23,100 19,100 12,700 8,360 11,100 9,470 10,400 13,900
18 14,500 16,100 23,300 22,900 22,500 18,800 12,800 8,500 10,200 9,880 10,500 13,500
19 14,200 16,700 23,300 24,300 22,400 18,500 13,700 8,430 9,970 10,200 11,400 12,800
20 13,500 17,500 24,500 23,900 22,000 18,100 14,900 8,700 9,750 10,000 12,000 12,500
21 13,500 18,800 24,700 23,200 20,800 18,600 14,500 8,640 9,370 9,470 13,100 12,300
22 13,700 20,700 23,900 22,400 20,100 18,400 14,100 9,160 9,090 9,470 12,400 12,300
23 13,800 21,800 23,500 22,100 20,000 18,900 14,300 9,130 9,010 9,510 12,300 12,900
24 14,400 22,500 23,400 21,900 19,700 19,000 14,200 9,550 8,820 9,920 12,100 13,400
25 14,700 22,600 23,500 21,200 19,600 18,600 14,000 10,100 8,430 10,700 12,200 13,600
26 14,800 22,700 22,500 20,500 19,600 18,400 13,600 10,300 8,180 11,100 11,900 13,800
27 14,800 22,700 21,800 20,900 20,100 18,000 13,000 10,300 8,290 11,300 12,300 14,300
28 14,500 22,800 21,300 20,800 20,600 18,100 12,300 10,600 8,640 11,500 13,300 15,000
29 14,000 13,600 21,000 21,100 21,300 17,900 11,600 10,600 9,040 11,400 13,700 15,900
30 13,900   21,300 22,100 21,500 17,600 11,200 10,100 8,850 11,300 14,100 16,500
31 13,800   21,300   21,700   10,800 9,770   11,900   16,600