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USGS Daily Statistics for the Nation

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
1 599 404 560 795 1,070 688 473 146 108 120 247 324
2 492 423 571 791 1,010 675 385 105 121 139 232 380
3 409 418 545 778 845 636 341 107 118 181 247 367
4 454 392 637 780 725 566 321 159 90 225 227 414
5 529 478 786 735 670 550 329 192 65 181 204 372
6 528 490 796 761 684 568 325 185 71 132 189 333
7 464 475 688 747 697 562 324 169 100 119 161 307
8 449 418 683 682 743 565 294 170 99 136 140 344
9 469 414 726 707 801 577 368 151 127 129 126 331
10 470 449 819 707 838 577 449 119 149 120 137 286
11 503 445 910 700 866 616 476 116 153 117 181 301
12 506 445 886 839 931 592 486 97 116 125 194 429
13 522 450 799 847 956 619 519 95 95 121 200 450
14 523 481 823 820 1,070 652 508 78 164 141 223 373
15 509 443 850 829 1,060 608 489 110 261 150 241 352
16 432 404 826 808 935 597 407 171 234 142 247 357
17 342 490 782 790 871 591 323 129 165 197 243 330
18 299 599 822 749 935 563 345 94 125 227 259 305
19 295 593 833 759 916 598 422 102 127 207 340 260
20 352 610 821 770 806 606 340 159 111 163 333 246
21 365 728 787 752 681 649 279 208 86 134 281 251
22 361 876 737 763 621 770 270 147 86 127 237 347
23 369 953 718 848 614 731 291 110 120 159 247 384
24 434 848 742 817 597 634 269 113 146 198 267 370
25 468 715 703 842 593 614 233 103 146 240 273 425
26 464 608 664 897 706 614 212 94 149 247 273 460
27 433 612 625 910 751 620 193 101 128 229 323 455
28 401 604 687 912 710 599 181 113 113 184 384 518
29 374 361 808 889 718 583 191 94 98 169 375 608
30 358   818 965 678 538 169 93 110 220 318 658
31 382   814   659   200 96   273   656