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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 05435500 PECATONICA RIVER AT FREEPORT, IL


Stephenson County, Illinois
Hydrologic Unit Code 07090003
Latitude  42°18'01", Longitude  89°36'55" NAD83
Drainage area 1,326.88  square miles
Gage datum 742.41 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 1913-10-01 -> 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
1 870 814 1,660 1,640 1,180 1,070 1,160 818 762 850 830 810
2 844 824 1,620 1,580 1,200 1,070 1,210 813 741 842 863 803
3 816 839 1,550 1,600 1,200 1,100 1,240 831 739 828 865 799
4 791 828 1,520 1,610 1,180 1,110 1,250 834 746 808 865 786
5 793 848 1,590 1,590 1,140 1,110 1,210 821 747 819 848 786
6 851 898 1,620 1,560 1,100 1,090 1,180 838 765 847 826 777
7 818 920 1,690 1,510 1,100 1,090 1,110 868 766 874 816 767
8 816 950 1,690 1,440 1,110 1,080 1,070 895 766 881 803 757
9 829 1,000 1,670 1,390 1,110 1,080 1,060 919 782 864 798 741
10 818 1,010 1,650 1,330 1,120 1,090 1,070 895 795 836 805 744
11 779 1,020 1,730 1,310 1,120 1,100 1,070 861 794 832 814 735
12 745 1,030 1,770 1,290 1,120 1,130 1,040 821 815 812 808 727
13 751 1,030 1,860 1,250 1,130 1,190 1,020 793 855 795 794 713
14 765 1,040 1,960 1,210 1,140 1,240 1,010 768 889 788 766 715
15 777 1,060 2,070 1,200 1,120 1,240 978 759 931 785 762 732
16 775 1,060 2,180 1,200 1,090 1,230 926 757 984 765 769 757
17 775 1,000 2,150 1,210 1,090 1,220 891 758 957 759 789 774
18 773 972 2,050 1,220 1,070 1,210 891 749 927 782 818 758
19 759 1,020 1,960 1,220 1,060 1,200 919 750 911 794 826 737
20 757 1,160 1,930 1,220 1,060 1,170 946 783 885 786 822 724
21 776 1,330 1,860 1,230 1,060 1,180 967 804 915 777 828 715
22 828 1,420 1,760 1,220 1,060 1,190 994 841 914 768 829 700
23 871 1,530 1,720 1,220 1,080 1,200 1,010 843 886 785 807 691
24 918 1,630 1,730 1,210 1,090 1,190 990 831 860 801 797 709
25 933 1,770 1,780 1,190 1,080 1,190 940 801 865 804 801 732
26 917 1,760 1,770 1,200 1,090 1,200 879 786 888 812 799 740
27 899 1,720 1,780 1,200 1,090 1,180 838 803 920 809 805 772
28 872 1,680 1,820 1,180 1,090 1,160 858 819 908 796 812 829
29 845 1,590 1,780 1,170 1,120 1,140 847 827 875 777 812 841
30 827   1,740 1,170 1,110 1,140 847 814 853 780 815 846
31 816   1,670   1,090   845 782   806   865