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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 14,300 23,000 22,300 24,300 21,500 17,400 10,400 9,320 8,820 12,500 14,200
2 15,900 14,200 22,700 23,100 25,700 21,500 16,900 9,700 9,030 8,300 12,600 14,700
3 15,500 14,500 22,200 23,200 25,200 21,000 16,300 9,590 9,350 8,330 12,300 15,100
4 14,800 14,700 21,900 23,100 23,800 20,000 16,300 9,560 9,160 9,230 11,800 15,200
5 15,400 14,700 22,600 22,700 22,300 19,200 15,500 9,920 8,710 9,110 11,600 15,100
6 15,900 14,700 22,200 22,300 20,800 18,900 14,900 9,830 8,350 9,090 11,500 15,500
7 15,500 15,000 21,400 22,500 20,700 18,300 14,500 9,340 8,170 8,970 11,400 15,100
8 14,700 14,900 21,600 22,300 20,800 17,900 14,100 8,990 8,780 8,730 11,000 14,900
9 14,600 15,200 22,300 21,800 21,800 17,900 13,400 9,040 8,900 8,770 10,900 14,600
10 15,400 15,200 23,300 21,700 22,500 18,600 13,200 8,950 8,950 8,480 10,800 14,500
11 15,500 15,300 25,000 21,900 22,700 19,000 13,400 8,740 9,700 8,170 11,000 14,200
12 15,600 15,600 25,300 21,500 22,900 19,000 13,500 8,410 9,380 8,290 10,900 14,100
13 15,500 15,200 24,800 22,200 23,300 18,500 13,800 8,420 9,760 8,360 11,200 14,800
14 16,100 15,000 24,500 21,700 23,800 19,000 14,000 8,260 10,600 8,850 11,200 14,300
15 16,400 15,200 25,100 22,000 24,200 19,200 13,800 8,310 11,300 9,300 10,900 14,400
16 16,000 15,600 24,700 22,900 23,700 19,300 13,200 8,110 11,600 9,660 10,700 14,700
17 15,400 15,600 24,000 23,300 23,100 19,100 12,700 8,360 11,100 9,470 10,500 14,100
18 14,700 16,400 23,500 23,200 22,500 18,800 12,800 8,500 10,200 9,880 10,600 13,700
19 14,500 17,100 23,400 24,600 22,400 18,500 13,700 8,430 9,970 10,200 11,500 13,100
20 13,800 17,800 24,600 24,300 22,000 18,100 14,900 8,700 9,750 10,000 12,100 12,600
21 13,700 19,200 24,700 23,400 20,800 18,600 14,500 8,640 9,370 9,470 13,200 12,500
22 13,900 21,100 23,900 22,600 20,100 18,400 14,100 9,160 9,090 9,470 12,500 12,500
23 14,000 22,300 23,600 22,300 20,000 18,900 14,300 9,130 9,010 9,510 12,400 13,000
24 14,700 22,900 23,500 22,100 19,700 19,000 14,200 9,550 8,820 9,920 12,200 13,600
25 14,900 23,000 23,600 21,300 19,600 18,600 14,000 10,100 8,430 10,700 12,400 13,800
26 15,000 23,100 22,600 20,700 19,600 18,400 13,600 10,300 8,180 11,100 12,000 14,100
27 15,100 23,100 22,000 21,000 20,100 18,000 13,000 10,300 8,290 11,300 12,400 14,600
28 14,800 23,200 21,500 21,000 20,600 18,100 12,300 10,600 8,640 11,500 13,500 15,200
29 14,300 13,600 21,100 21,100 21,300 17,900 11,600 10,600 9,040 11,400 13,900 16,100
30 14,100   21,500 22,100 21,500 17,600 11,200 10,100 8,850 11,300 14,300 16,700
31 14,000   21,500   21,700   10,800 9,770   11,900   16,700