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USGS Surface-Water 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 -> 2024-09-30)

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
1 605 409 567 802 1,050 691 478 148 109 122 250 328
2 496 428 578 788 1,000 678 389 106 122 140 235 384
3 412 422 552 761 840 639 344 108 119 184 249 372
4 458 396 644 768 722 568 325 160 91 228 229 419
5 535 484 782 727 668 552 332 194 66 183 207 377
6 534 496 787 756 684 570 328 187 71 134 191 337
7 470 480 684 744 698 564 327 171 102 120 162 311
8 454 422 683 674 744 568 298 172 100 138 142 349
9 475 419 730 701 804 580 373 152 128 131 128 335
10 476 454 825 703 842 581 453 120 150 122 138 290
11 509 450 918 699 871 621 479 117 155 119 183 305
12 512 450 894 841 938 597 489 98 118 127 196 434
13 528 456 807 848 963 624 523 96 96 122 202 456
14 529 487 831 822 1,050 658 514 79 166 142 226 378
15 515 448 858 832 1,030 613 494 111 264 152 244 357
16 437 408 829 811 919 602 411 172 237 144 250 361
17 346 495 785 794 862 596 327 130 167 200 246 334
18 302 606 827 753 931 568 348 95 126 230 262 308
19 299 600 839 762 915 604 426 103 128 209 344 263
20 356 617 827 771 806 612 344 160 113 165 337 249
21 370 737 793 754 681 656 283 211 87 136 284 254
22 365 886 742 766 622 778 273 149 87 128 240 351
23 373 965 723 853 615 739 294 111 122 161 250 389
24 439 859 742 820 599 641 272 114 148 200 270 375
25 474 724 703 844 595 620 236 104 148 243 276 430
26 469 616 664 902 707 620 214 95 150 250 276 465
27 438 619 625 910 736 626 195 102 129 232 327 460
28 406 611 687 904 701 605 183 114 114 186 389 524
29 378 361 808 857 715 589 193 95 99 171 380 616
30 362   818 920 679 543 171 94 112 223 322 666
31 386   814   661   203 97   276   663