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USGS Surface-Water 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 05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL


Tazewell County, Illinois
Hydrologic Unit Code 07130004
Latitude  40°27'16.8", Longitude  89°36'22.2" NAD83
Drainage area 1,073  square miles
Gage datum 476.67 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 1920-10-01 -> 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
1 789 735 1,110 1,450 1,630 1,200 914 278 263 310 450 552
2 702 710 983 1,400 1,620 1,170 786 256 324 283 489 594
3 698 731 968 1,300 1,470 1,080 759 254 369 328 501 582
4 701 783 944 1,210 1,380 1,020 675 318 346 373 418 516
5 817 854 927 1,150 1,340 944 610 369 387 450 407 469
6 889 955 909 1,200 1,220 900 779 374 416 410 367 441
7 875 1,060 906 1,300 1,160 877 670 315 382 410 344 463
8 818 1,090 923 1,290 1,190 971 637 240 329 367 331 512
9 785 1,070 1,000 1,220 1,320 899 687 254 398 329 306 504
10 776 952 1,160 1,210 1,420 821 945 228 396 301 331 487
11 876 815 1,300 1,350 1,530 846 980 214 354 265 309 447
12 810 804 1,320 1,470 1,660 1,000 886 199 314 266 299 438
13 826 818 1,300 1,520 1,670 1,070 703 227 281 241 344 510
14 869 850 1,210 1,440 1,660 1,060 612 224 506 228 413 530
15 928 814 1,210 1,410 1,610 1,090 510 204 581 224 414 544
16 912 782 1,250 1,430 1,510 1,130 584 247 585 225 407 516
17 755 831 1,240 1,460 1,530 984 667 238 593 269 418 528
18 639 895 1,210 1,440 1,730 909 642 221 497 284 464 502
19 638 939 1,230 1,410 1,900 1,010 533 198 291 287 469 466
20 642 984 1,270 1,520 1,770 1,140 482 239 274 293 473 437
21 652 1,190 1,200 1,420 1,500 1,260 476 281 244 243 470 447
22 657 1,260 1,120 1,290 1,290 1,150 496 444 259 264 456 492
23 694 1,190 1,180 1,420 1,080 994 488 334 210 304 483 523
24 900 1,160 1,200 1,470 1,100 902 508 342 211 307 476 596
25 959 1,250 1,200 1,470 1,130 850 412 265 230 383 467 629
26 899 1,270 1,190 1,420 1,170 955 412 220 250 356 478 578
27 779 1,380 1,120 1,400 1,330 859 374 220 289 321 531 677
28 748 1,270 1,050 1,370 1,320 939 316 212 271 334 637 796
29 656 1,140 1,090 1,330 1,320 991 283 212 297 300 639 814
30 612   1,180 1,430 1,240 991 316 234 295 415 612 864
31 716   1,320   1,270   296 283   436   919