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USGS Surface-Water 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 07195400 Illinois River at Hwy. 16 near Siloam Springs AR


Benton County, Arkansas
Hydrologic Unit Code 11110103
Latitude  36°08'41", Longitude  94°29'41" NAD83
Drainage area 509  square miles
Gage datum 933.07 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 1978-10-01 -> 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
1 705 437 549 1,100 1,440 725 461 325 212 200 545 817
2 605 417 486 741 1,320 730 389 279 247 193 424 562
3 580 406 901 724 1,540 644 834 338 309 234 364 478
4 854 560 779 872 1,640 627 502 344 419 206 353 443
5 934 554 648 811 2,930 637 426 275 277 260 370 419
6 614 567 537 687 1,460 538 402 307 254 1,080 358 394
7 521 575 500 642 965 974 424 292 237 614 642 430
8 479 588 543 1,090 926 717 597 507 232 293 592 402
9 466 629 646 677 962 652 635 372 333 913 574 393
10 458 524 670 1,410 1,540 651 789 381 297 564 349 467
11 894 594 590 915 1,170 554 444 344 259 708 333 535
12 627 613 609 738 974 498 362 306 245 388 323 580
13 943 658 572 1,080 903 485 776 365 220 471 293 586
14 823 560 807 846 940 468 472 401 464 464 279 780
15 634 530 764 689 1,000 444 415 337 381 388 281 590
16 515 543 717 633 1,050 450 565 290 376 335 323 474
17 465 924 718 579 964 470 445 406 441 300 378 476
18 569 640 1,030 870 775 432 430 357 379 275 658 872
19 574 515 2,290 827 743 1,180 342 336 277 316 888 491
20 481 487 1,250 716 1,170 525 294 300 283 287 541 436
21 476 706 964 770 1,060 409 288 292 264 288 374 483
22 463 628 986 1,300 1,000 379 399 300 362 287 461 442
23 506 597 818 1,250 992 684 309 333 450 318 398 400
24 455 1,160 1,010 2,450 2,070 701 290 307 459 419 388 372
25 564 813 1,090 3,040 1,670 419 344 261 338 518 400 412
26 562 573 1,020 2,630 1,330 376 285 251 350 395 371 425
27 472 549 1,040 1,320 947 469 285 261 266 403 510 2,440
28 550 622 1,060 1,840 971 369 341 251 235 436 676 2,150
29 485 366 985 2,390 732 357 285 229 261 532 477 875
30 527   1,020 3,280 875 384 341 257 1,170 770 905 638
31 461   971   688   394 220   530   652