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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", Longitude  89°21'22" NAD83
Drainage area 13,544  square miles
Gage datum 425.88 feet above NGVD29
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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 -> 2022-09-30)

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 16,300 13,600 22,800 21,700 24,100 22,100 18,100 10,500 9,730 9,180 12,800 14,600
2 16,100 13,500 22,600 22,000 25,700 22,200 17,700 9,870 9,500 8,630 12,900 15,200
3 15,500 14,000 22,200 22,000 25,300 21,600 17,000 9,810 9,750 8,740 12,700 15,300
4 14,800 14,400 21,900 22,000 23,800 20,600 16,900 9,820 9,610 9,670 12,100 15,500
5 15,500 14,300 22,600 21,600 22,100 19,800 16,000 10,300 9,160 9,560 11,900 15,300
6 16,000 14,400 22,000 21,300 20,600 19,300 15,200 10,100 8,760 9,480 11,800 15,800
7 15,600 14,800 21,100 21,400 20,500 18,700 14,900 9,500 8,490 9,430 11,600 15,500
8 14,800 14,800 21,300 21,200 20,400 18,300 14,300 9,000 9,160 9,180 11,300 15,300
9 14,800 15,000 22,000 20,800 21,500 18,300 13,700 9,050 9,270 9,180 11,200 14,900
10 15,500 15,000 23,000 20,900 22,300 19,100 13,400 8,950 9,350 8,920 11,100 14,800
11 15,400 15,100 25,000 21,300 22,500 19,600 13,700 8,780 10,100 8,590 11,200 14,500
12 15,500 15,400 25,400 21,100 23,000 19,600 13,800 8,470 9,690 8,540 11,300 14,500
13 15,400 15,100 25,000 21,900 23,500 19,100 14,000 8,500 10,100 8,630 11,500 15,200
14 16,000 14,900 24,700 21,500 24,000 19,600 14,200 8,400 11,000 9,060 11,500 14,700
15 16,300 15,100 25,400 21,800 24,300 20,000 13,900 8,430 11,700 9,450 11,100 14,700
16 16,000 15,500 25,000 22,900 23,900 20,000 13,100 8,230 12,100 9,830 11,100 14,900
17 15,500 15,700 24,300 23,300 23,300 20,000 12,400 8,470 11,600 9,690 10,800 14,100
18 14,800 16,500 23,800 23,300 22,800 19,600 12,600 8,630 10,600 10,200 10,900 13,700
19 14,600 17,200 23,800 25,000 22,900 19,300 13,700 8,680 10,200 10,600 11,800 13,100
20 13,800 18,000 25,000 24,700 22,500 18,900 15,100 8,870 10,100 10,400 12,500 12,600
21 13,800 19,500 25,200 23,800 21,300 19,500 14,700 8,910 9,780 9,810 13,600 12,600
22 14,000 21,500 24,200 23,000 20,400 19,400 14,300 9,460 9,420 9,820 12,900 12,700
23 14,100 22,600 24,000 22,700 20,400 19,800 14,700 9,500 9,330 9,940 12,700 13,300
24 14,800 23,100 23,800 22,300 20,100 19,900 14,400 9,950 9,060 10,400 12,500 13,900
25 15,000 23,100 23,800 21,500 20,000 19,500 14,100 10,600 8,630 11,000 12,700 14,100
26 14,800 23,100 22,500 20,900 20,100 19,000 13,700 10,700 8,410 11,600 12,300 14,200
27 14,200 23,200 21,800 21,300 20,600 18,700 13,100 10,900 8,470 11,700 12,800 14,700
28 13,500 23,200 21,400 21,200 21,000 18,900 12,400 11,100 8,950 11,900 13,900 15,400
29 13,000 13,900 21,100 21,100 21,700 18,700 11,800 11,100 9,370 11,800 14,400 16,300
30 13,000   21,500 22,000 22,100 18,300 11,300 10,400 9,180 11,700 14,700 16,800
31 13,200   21,300   22,300   10,900 10,200   12,300   16,800