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USGS Daily Statistics for the Nation

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 05586100 ILLINOIS RIVER AT VALLEY CITY, IL


Scott County, Illinois
Hydrologic Unit Code 07130011
Latitude  39°42'11.5", Longitude  90°38'35.1" NAD83
Drainage area 26,743  square miles
Gage datum 417.68 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 1938-10-01 -> 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 20,500 22,500 31,400 37,100 38,900 35,600 30,500 17,800 11,900 12,900 13,700 17,200
2 21,100 22,500 31,500 37,200 38,800 35,500 30,300 17,100 11,700 12,800 14,100 17,500
3 21,500 22,500 31,800 37,200 39,100 35,300 30,000 16,400 11,900 12,800 14,500 17,700
4 21,900 22,600 32,000 37,100 39,100 34,900 29,200 15,900 12,000 13,000 14,800 17,800
5 22,200 22,900 32,400 37,300 39,600 34,500 28,500 15,600 11,800 13,300 15,000 17,800
6 22,300 23,100 32,600 37,400 39,600 34,000 27,900 15,600 11,600 13,300 15,200 18,200
7 22,200 23,300 32,800 37,400 39,300 33,400 27,300 15,700 11,400 13,200 15,200 18,400
8 22,200 23,300 32,800 37,400 39,100 33,000 26,800 15,500 11,300 13,300 15,200 18,600
9 22,100 23,500 32,800 37,200 38,900 32,400 26,300 15,200 11,200 13,200 15,000 18,700
10 22,200 23,900 33,200 37,000 39,000 32,000 25,900 14,900 11,300 13,100 14,800 18,500
11 22,400 24,100 33,500 37,100 39,000 31,900 25,400 14,700 11,200 13,100 14,900 18,600
12 22,300 24,200 33,900 37,200 38,900 31,600 24,700 14,300 11,100 13,200 15,000 18,600
13 22,100 24,500 34,400 37,100 38,700 31,700 23,900 14,100 11,100 13,100 15,000 18,600
14 22,200 24,600 34,800 37,200 38,400 31,500 23,300 13,600 11,500 13,100 15,000 18,500
15 22,300 24,800 35,300 37,300 38,400 31,400 22,900 13,200 11,600 13,100 14,800 18,700
16 22,300 25,000 35,800 37,200 38,500 31,500 22,500 13,000 11,900 13,300 14,600 18,800
17 22,300 25,300 36,200 37,300 38,800 31,700 22,100 12,700 12,200 13,200 14,500 19,100
18 22,200 25,600 36,500 37,400 39,200 31,600 21,400 12,500 12,300 13,100 14,500 19,100
19 22,200 25,900 36,700 37,700 39,700 31,500 21,000 12,400 12,400 12,900 14,700 19,000
20 22,000 26,500 36,900 37,900 39,800 31,600 20,700 12,400 12,600 12,900 14,900 18,800
21 21,500 27,200 37,100 38,100 39,800 31,600 20,600 12,400 12,800 12,700 15,500 18,600
22 21,600 28,100 37,000 38,300 39,600 31,700 20,700 12,200 12,900 12,500 15,800 18,400
23 21,800 29,000 37,100 38,600 39,200 31,400 20,400 12,200 13,000 12,700 15,800 18,200
24 22,100 29,700 37,200 38,700 38,800 31,200 20,500 12,100 12,900 12,800 15,700 18,100
25 22,200 30,300 37,100 38,800 38,300 31,300 20,500 11,800 12,800 13,000 15,700 18,200
26 22,500 30,900 37,300 38,700 37,800 31,200 20,400 11,900 13,000 13,200 15,800 18,400
27 22,500 31,200 37,300 38,700 37,300 31,200 20,200 11,800 12,700 13,300 15,900 18,600
28 22,400 31,100 37,300 38,700 36,900 31,000 19,800 11,600 12,600 13,200 16,300 18,800
29 22,300 24,900 37,200 38,800 36,600 30,700 19,400 11,700 12,700 13,300 16,600 19,200
30 22,500   37,200 38,900 36,200 30,700 18,800 11,800 12,800 13,300 16,700 19,700
31 22,600   37,100   35,800   18,300 11,700   13,400   20,000