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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 05440700 ROCK RIVER AT BYRON, IL


Ogle County, Illinois
Hydrologic Unit Code 07090005
Latitude  42°07'19.88", Longitude  89°15'19.31" NAD83
Drainage area 7,990  square miles
Contributing drainage area 7,990.00  square miles
Gage datum 666.00 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 1999-10-01 -> 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 6,890 6,000 8,450 11,200 10,800 9,500 9,850 6,350 5,230 5,240 6,070 6,250
2 6,760 5,890 8,600 11,200 10,600 9,590 9,430 6,120 5,240 5,470 5,990 6,310
3 6,570 5,890 8,590 11,300 10,400 9,410 9,330 5,850 5,410 5,740 5,930 6,350
4 6,460 5,860 8,550 11,300 10,200 9,730 8,940 5,740 5,490 5,840 5,950 6,250
5 6,260 5,820 8,580 11,400 10,000 10,100 8,610 5,640 5,570 5,920 5,970 6,090
6 6,160 5,750 8,630 11,300 9,760 9,780 8,470 5,570 5,430 6,120 5,970 5,870
7 6,160 5,830 8,590 11,200 9,590 9,450 8,250 5,720 5,260 6,190 5,940 5,710
8 6,210 6,230 8,740 11,100 9,420 9,210 8,070 5,980 5,230 6,160 5,870 5,620
9 6,260 6,470 9,090 11,100 9,440 9,380 7,820 6,010 5,260 5,980 5,940 5,610
10 6,230 6,710 9,930 11,200 9,440 9,530 7,600 5,840 5,260 5,840 6,080 5,670
11 6,210 6,860 10,900 11,300 9,520 9,530 7,510 5,720 5,340 5,890 6,050 5,620
12 6,270 6,780 11,500 11,400 9,610 9,710 7,450 5,630 5,790 5,840 6,020 5,490
13 6,300 6,730 12,100 11,300 9,910 10,200 7,580 5,430 6,250 5,730 5,900 5,540
14 6,220 6,700 12,300 11,200 10,100 10,300 7,660 5,420 6,410 5,760 5,770 5,780
15 6,040 6,720 12,200 11,100 10,200 10,300 7,630 5,290 6,350 5,900 5,740 6,030
16 5,920 6,780 12,100 11,100 10,200 10,200 7,600 5,080 6,000 5,960 5,670 6,150
17 6,060 6,880 11,800 11,100 9,920 9,910 7,410 4,950 5,810 5,930 5,640 5,970
18 6,170 7,080 11,600 11,400 9,890 9,660 7,180 4,780 5,670 5,930 5,680 5,880
19 6,000 7,180 11,400 11,400 9,930 10,100 6,920 4,840 5,590 5,800 5,770 5,780
20 5,770 7,490 11,300 11,300 9,630 10,500 7,030 5,190 5,560 5,690 5,730 5,670
21 5,690 8,020 11,300 11,200 9,370 10,300 7,090 5,420 5,470 5,530 5,700 5,780
22 5,710 7,990 11,100 10,800 9,280 10,200 7,270 5,690 5,580 5,480 5,730 5,890
23 5,740 7,840 10,900 10,600 9,430 10,200 7,400 5,730 5,890 5,660 5,670 5,970
24 5,890 8,180 10,800 10,400 9,570 10,100 7,970 5,720 5,830 5,910 5,620 6,250
25 6,010 8,610 11,000 10,200 9,490 9,890 7,970 5,830 5,590 6,040 5,610 6,340
26 6,020 8,420 11,200 10,200 9,320 10,000 7,440 5,890 5,520 6,140 5,710 6,320
27 5,960 8,510 11,100 10,300 9,230 10,300 7,260 5,880 5,480 6,320 6,010 6,400
28 5,930 8,620 11,100 10,200 9,290 10,100 7,200 5,820 5,330 6,420 6,190 6,830
29 5,910 7,180 11,100 10,200 9,220 10,200 7,160 5,800 5,250 6,280 6,230 7,110
30 5,770   11,000 10,500 9,260 10,100 6,900 5,640 5,240 6,230 6,250 7,130
31 5,940   11,100   9,410   6,630 5,430   6,210   6,950