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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 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
1 693 439 543 1,100 1,440 726 452 320 214 198 536 797
2 596 415 482 741 1,320 721 383 275 245 191 415 551
3 571 403 901 724 1,510 636 810 333 304 231 358 469
4 834 551 779 872 1,600 619 491 338 410 203 420 435
5 911 544 648 811 2,880 649 442 271 273 255 647 413
6 603 557 537 687 1,520 548 405 302 251 1,050 417 388
7 513 564 500 642 1,100 958 420 288 234 596 655 422
8 471 576 543 1,090 986 707 585 494 229 287 596 395
9 459 615 646 663 1,040 644 623 365 326 884 634 386
10 452 513 670 1,360 1,540 641 774 374 292 548 399 458
11 870 584 590 901 1,170 547 439 337 255 686 355 523
12 614 611 609 728 970 492 358 305 241 378 337 566
13 917 666 572 1,050 897 479 756 361 217 458 303 572
14 803 560 807 826 935 462 463 394 452 451 286 761
15 621 527 764 674 991 438 408 332 371 379 286 584
16 506 539 717 620 1,040 444 551 286 367 328 325 476
17 458 904 718 568 955 462 437 407 429 294 376 482
18 559 630 1,030 846 776 425 424 358 370 270 650 865
19 563 510 2,290 805 736 1,140 339 341 271 309 907 496
20 472 481 1,250 698 1,150 514 292 304 278 281 552 438
21 468 692 964 750 1,040 403 288 291 259 282 383 480
22 455 616 986 1,250 986 374 408 297 353 282 463 439
23 496 588 818 1,210 987 667 312 328 438 311 399 398
24 447 1,140 1,010 2,360 2,010 683 291 303 447 408 388 388
25 551 804 1,090 2,930 1,630 412 342 258 331 503 398 443
26 550 571 1,020 2,530 1,350 371 284 248 342 385 369 439
27 463 546 1,040 1,290 942 464 284 257 262 393 503 2,380
28 538 615 1,060 1,830 954 365 337 248 231 425 662 2,100
29 475 366 985 2,400 722 353 282 227 256 517 469 864
30 520   1,020 3,200 857 378 336 253 1,130 747 881 633
31 470   971   676   387 219   522   645