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USGS Daily Statistics for Arkansas

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 -> 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
1 705 437 549 1,100 1,440 726 452 320 214 198 545 817
2 605 417 486 741 1,320 721 383 275 245 191 424 562
3 580 406 901 724 1,510 636 810 333 304 231 364 478
4 854 560 779 872 1,600 619 491 338 410 203 353 443
5 934 554 648 811 2,880 649 442 271 273 255 370 419
6 614 567 537 687 1,520 548 405 302 251 1,050 358 394
7 521 575 500 642 1,100 958 420 288 234 596 642 430
8 479 588 543 1,090 986 707 585 494 229 293 592 402
9 466 629 646 663 1,040 644 623 365 326 913 574 393
10 458 524 670 1,360 1,540 641 774 374 292 564 349 467
11 894 594 590 901 1,170 547 439 337 255 708 333 535
12 627 613 609 728 970 492 358 305 241 388 323 580
13 943 658 572 1,050 897 479 756 361 217 471 293 586
14 823 560 807 826 935 462 463 394 452 464 279 780
15 634 530 764 674 991 438 408 332 371 388 281 590
16 515 543 717 620 1,040 444 551 286 367 335 323 474
17 465 924 718 568 955 462 437 407 429 300 378 476
18 569 640 1,030 846 776 425 424 358 370 275 658 872
19 574 515 2,290 805 736 1,140 339 341 271 316 888 491
20 481 487 1,250 698 1,150 514 292 304 278 287 541 436
21 476 706 964 750 1,040 403 288 291 259 288 374 483
22 463 628 986 1,250 986 374 408 297 353 287 461 442
23 506 597 818 1,210 987 667 312 328 438 318 398 400
24 455 1,160 1,010 2,360 2,010 683 291 303 447 419 388 372
25 564 813 1,090 2,930 1,630 412 342 258 331 518 400 412
26 562 573 1,020 2,530 1,350 371 284 248 342 395 371 425
27 472 549 1,040 1,290 942 464 284 257 262 403 510 2,440
28 550 622 1,060 1,830 954 365 337 248 231 436 676 2,150
29 485 366 985 2,400 722 353 282 227 256 532 477 875
30 527   1,020 3,200 857 378 336 253 1,130 770 905 638
31 461   971   676   387 219   530   652