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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
1 599 404 560 787 1,060 682 469 146 108 120 247 324
2 492 423 571 784 1,000 669 382 105 121 139 232 380
3 409 418 545 782 838 630 338 107 118 181 247 367
4 454 392 637 789 719 561 319 159 90 225 227 414
5 529 478 786 742 665 564 326 192 65 181 204 372
6 528 490 796 770 678 599 322 185 71 132 189 333
7 464 475 688 753 691 580 321 169 100 119 161 307
8 449 418 683 684 736 574 292 170 99 136 140 344
9 469 414 726 706 793 586 365 151 127 129 126 331
10 470 449 819 704 829 586 444 119 149 120 137 286
11 503 445 910 696 857 620 471 116 153 117 181 301
12 506 445 886 833 921 593 481 97 116 125 194 429
13 522 450 799 841 946 618 513 95 95 121 200 450
14 523 481 823 814 1,060 650 503 78 164 141 223 373
15 509 443 850 822 1,050 608 489 110 261 150 241 352
16 432 404 826 801 926 595 407 171 234 142 247 357
17 342 490 782 783 862 588 323 129 165 197 243 330
18 299 599 822 742 925 561 345 94 125 227 259 305
19 295 593 833 752 906 621 422 102 127 207 340 260
20 352 610 821 764 798 628 340 159 111 163 333 246
21 365 728 787 746 680 657 279 208 86 134 281 251
22 361 876 737 758 628 770 270 147 86 127 237 347
23 369 953 718 842 617 729 291 110 120 159 247 384
24 434 848 737 811 596 632 269 113 146 198 267 370
25 468 715 697 835 591 611 233 103 146 240 273 425
26 464 608 659 891 701 610 212 94 149 247 273 460
27 433 612 620 904 745 616 193 101 128 229 323 455
28 401 604 681 906 704 595 181 113 113 184 384 518
29 374 361 800 883 712 578 191 94 98 169 375 608
30 358   810 956 673 533 169 93 110 220 318 658
31 382   806   654   200 96   273   656