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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 -> 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
1 834 697 1,020 1,140 1,100 873 732 208 185 205 276 525
2 803 691 992 1,140 1,090 875 681 187 199 203 294 523
3 803 679 970 1,140 1,050 854 650 181 202 203 316 523
4 807 673 996 1,170 987 786 616 177 187 219 315 513
5 811 715 1,100 1,160 932 754 582 170 173 214 310 501
6 811 735 1,100 1,150 864 770 535 178 165 209 307 487
7 791 704 1,080 1,140 826 779 489 190 163 206 296 486
8 784 667 1,070 1,100 820 792 482 197 156 201 278 498
9 774 666 1,080 1,060 816 820 562 183 161 204 263 490
10 733 710 1,110 1,020 822 845 604 179 169 212 250 477
11 715 718 1,180 1,020 828 855 615 171 175 220 259 482
12 717 726 1,180 1,060 859 872 638 160 177 238 276 514
13 730 726 1,170 1,070 923 947 661 159 181 238 280 527
14 736 741 1,170 1,070 968 976 677 154 215 239 290 518
15 716 769 1,150 1,080 980 1,000 652 142 253 238 312 551
16 699 768 1,130 1,080 979 988 591 136 254 242 334 581
17 657 808 1,100 1,080 980 949 525 138 242 274 363 570
18 623 862 1,100 1,060 977 916 488 149 232 301 382 548
19 611 905 1,120 1,040 960 880 468 161 223 300 414 522
20 606 930 1,150 1,040 935 848 461 177 207 291 431 496
21 607 1,050 1,150 1,030 909 815 465 185 192 279 429 497
22 618 1,120 1,120 1,010 867 784 483 183 189 283 417 555
23 646 1,170 1,080 1,010 838 755 468 180 196 298 415 580
24 701 1,210 1,060 987 801 731 446 162 205 331 427 588
25 707 1,170 1,030 988 778 720 418 149 204 351 422 616
26 699 1,110 1,020 987 789 720 381 155 200 362 428 627
27 696 1,070 1,020 999 791 731 346 154 196 359 447 645
28 705 1,070 1,070 1,020 801 794 317 149 203 343 479 672
29 705 657 1,100 1,030 813 787 278 160 210 321 501 735
30 715   1,110 1,060 822 761 249 168 206 299 519 786
31 715   1,120   861   235 165   289   834