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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
1 693 439 543 1,100 1,440 725 452 320 214 198 536 797
2 596 415 482 741 1,320 720 383 275 245 191 415 551
3 571 403 901 724 1,510 635 810 333 304 231 358 469
4 834 551 779 872 1,600 618 491 338 410 203 419 435
5 911 544 648 811 2,880 648 442 271 273 255 645 413
6 603 557 537 687 1,520 547 405 302 251 1,050 417 388
7 513 564 500 642 1,100 957 420 287 233 596 655 422
8 471 576 543 1,090 985 707 584 494 229 287 596 395
9 459 615 646 663 1,040 643 623 365 326 884 633 386
10 452 513 670 1,360 1,540 640 774 373 292 548 399 458
11 870 584 590 901 1,170 546 439 337 255 686 355 524
12 614 611 609 728 969 491 358 305 241 378 337 566
13 917 666 572 1,050 896 479 756 360 217 458 303 572
14 803 560 807 826 934 461 463 394 452 451 286 761
15 621 527 764 674 991 437 408 332 371 378 286 584
16 506 539 717 620 1,040 443 551 286 367 328 325 476
17 458 904 718 568 954 462 437 407 429 294 376 482
18 559 630 1,030 846 775 425 424 357 370 270 650 865
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 1,040 403 287 291 259 282 383 480
22 455 616 986 1,250 985 374 407 297 353 281 463 439
23 496 588 818 1,210 986 666 312 328 437 311 399 398
24 448 1,140 1,010 2,360 2,010 683 291 303 447 408 388 388
25 551 804 1,090 2,930 1,630 411 341 258 331 503 398 443
26 550 571 1,020 2,530 1,350 371 283 248 342 385 369 440
27 463 546 1,040 1,290 941 464 283 257 262 393 503 2,380
28 538 615 1,060 1,830 953 365 336 248 231 425 662 2,100
29 475 367 985 2,400 721 353 282 227 256 517 469 864
30 520   1,020 3,200 857 378 336 253 1,130 746 881 633
31 470   971   676   387 218   522   645