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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 05525000 IROQUOIS RIVER AT IROQUOIS, IL


Iroquois County, Illinois
Hydrologic Unit Code 07120002
Latitude  40°49'23", Longitude  87°34'54" NAD83
Drainage area 686  square miles
Gage datum 614.13 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 1944-10-01 -> 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
1 831 684 1,010 1,120 1,100 895 756 212 185 211 281 536
2 801 683 978 1,120 1,090 898 702 190 202 210 299 535
3 805 674 960 1,110 1,050 876 669 185 206 209 322 535
4 808 672 984 1,150 989 807 635 180 191 226 322 525
5 816 722 1,070 1,140 936 774 600 172 177 221 316 513
6 821 747 1,070 1,130 864 790 552 165 169 215 314 499
7 804 719 1,050 1,120 822 794 504 171 167 212 301 498
8 799 682 1,040 1,090 807 797 498 172 160 207 283 510
9 788 682 1,050 1,040 800 820 580 159 165 210 268 503
10 735 722 1,090 1,020 811 845 619 159 174 219 255 490
11 715 728 1,170 1,010 825 855 618 156 180 227 265 494
12 717 727 1,180 1,050 864 874 639 153 182 246 282 528
13 724 727 1,180 1,060 936 954 661 157 184 245 286 541
14 730 745 1,190 1,060 980 987 678 154 220 246 297 532
15 715 778 1,170 1,070 991 1,020 653 142 260 245 320 563
16 704 779 1,150 1,080 992 1,010 589 136 262 249 342 588
17 664 802 1,120 1,080 995 971 521 139 250 282 373 577
18 632 849 1,120 1,060 994 940 480 150 239 311 392 555
19 618 893 1,140 1,050 978 904 461 163 229 310 426 531
20 607 921 1,170 1,050 954 873 456 180 213 300 444 505
21 608 1,050 1,170 1,040 926 839 466 189 197 288 442 508
22 621 1,120 1,140 1,020 881 808 490 187 194 292 429 568
23 653 1,140 1,090 1,020 854 778 478 184 202 308 427 594
24 711 1,170 1,060 997 817 754 443 166 211 342 439 600
25 716 1,140 1,020 993 794 742 407 153 210 362 434 628
26 702 1,080 1,010 991 806 742 369 158 206 373 440 640
27 685 1,050 1,020 1,000 805 754 338 157 202 365 459 658
28 678 1,050 1,070 1,020 814 819 314 153 209 348 484 686
29 674 670 1,110 1,030 827 812 280 164 217 326 506 746
30 687   1,120 1,050 838 786 252 170 212 305 526 791
31 691   1,120   882   239 163   295   834