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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
1 602 398 572 802 1,050 691 478 148 109 122 250 328
2 494 418 583 788 1,000 678 389 106 122 140 235 384
3 411 413 556 761 840 639 344 108 119 184 249 372
4 458 388 650 768 722 568 325 160 91 228 229 419
5 537 479 789 727 668 552 332 194 66 183 207 377
6 536 493 795 756 684 570 328 187 71 134 191 337
7 471 478 690 744 698 564 327 171 102 120 162 311
8 456 420 690 674 744 568 298 172 100 138 142 349
9 475 417 732 701 804 580 373 152 128 131 128 335
10 456 454 822 703 842 581 453 120 150 122 138 290
11 488 450 920 699 871 621 479 117 155 119 183 305
12 501 451 899 841 938 597 489 98 118 127 196 434
13 502 457 811 848 963 624 523 96 96 122 202 456
14 504 489 836 822 1,050 658 514 79 166 142 226 378
15 506 450 862 832 1,030 613 494 111 264 152 244 357
16 433 410 834 811 919 602 411 172 237 144 250 361
17 343 498 790 794 862 596 327 130 167 200 246 334
18 300 611 833 753 931 568 348 95 126 230 262 308
19 298 604 846 762 915 604 426 103 128 209 344 260
20 356 621 834 771 806 612 344 160 113 165 337 248
21 370 743 799 754 681 656 283 211 87 136 284 254
22 366 894 748 766 622 778 273 149 87 128 240 353
23 374 973 730 853 615 739 294 111 122 161 250 389
24 438 866 749 820 599 641 272 114 148 200 270 370
25 451 729 709 844 595 620 236 104 148 243 276 427
26 403 620 670 902 707 620 214 95 150 250 276 461
27 375 624 630 910 736 626 195 102 129 232 327 454
28 368 616 693 904 701 605 183 114 114 186 389 522
29 351 368 816 857 715 589 193 95 99 171 380 613
30 345   826 920 679 543 171 94 112 223 322 655
31 373   822   661   203 97   276   656