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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 05554500 VERMILION RIVER AT PONTIAC, IL


Livingston County, Illinois
Hydrologic Unit Code 07130002
Latitude  40°52'40.2", Longitude  88°38'09.6" NAD83
Drainage area 579  square miles
Gage datum 619.02 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 1942-10-01 -> 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
1 605 409 567 795 1,070 688 473 146 108 120 250 328
2 496 428 578 791 1,010 675 385 105 121 139 235 384
3 412 422 552 778 845 636 341 107 118 181 249 372
4 458 396 644 780 725 566 321 159 90 225 229 419
5 535 484 782 735 670 550 329 192 65 181 207 377
6 534 496 787 761 684 568 325 185 71 132 191 337
7 470 480 684 747 697 562 324 169 100 119 162 311
8 454 422 683 682 743 565 294 170 99 136 142 349
9 475 419 730 707 801 577 368 151 127 129 128 335
10 476 454 825 707 838 577 449 119 149 120 138 290
11 509 450 918 700 866 616 476 116 153 117 183 305
12 512 450 894 839 931 592 486 97 116 125 196 434
13 528 456 807 847 956 619 519 95 95 121 202 456
14 529 487 831 820 1,070 652 508 78 164 141 226 378
15 515 448 858 829 1,060 608 489 110 261 150 244 357
16 437 408 829 808 935 597 407 171 234 142 250 361
17 346 495 785 790 871 591 323 129 165 197 246 334
18 302 606 827 749 935 563 345 94 125 227 262 308
19 299 600 839 759 916 598 422 102 127 207 344 263
20 356 617 827 770 806 606 340 159 111 163 337 249
21 370 737 793 752 681 649 279 208 86 136 284 254
22 365 886 742 763 621 770 270 147 86 128 240 351
23 373 965 723 848 614 731 291 110 120 161 250 389
24 439 859 742 817 597 634 269 113 146 200 270 375
25 474 724 703 842 593 614 233 103 146 243 276 430
26 469 616 664 897 706 614 212 94 149 250 276 465
27 438 619 625 910 751 620 193 101 128 232 327 460
28 406 611 687 912 710 599 181 113 113 186 389 524
29 378 361 808 889 718 583 191 94 98 171 380 616
30 362   818 965 678 538 169 93 110 223 322 666
31 386   814   659   200 96   276   663