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USGS 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 05542000 MAZON RIVER NEAR COAL CITY, IL


Grundy County, Illinois
Hydrologic Unit Code 07120005
Latitude  41°17'10.3", Longitude  88°21'35.5" NAD83
Drainage area 455  square miles
Gage datum 527.21 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 1939-10-01 -> 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
1 503 319 450 674 861 534 392 74 171 146 243 312
2 390 339 465 729 786 561 287 65 258 146 230 342
3 334 306 437 726 593 456 240 55 190 142 227 425
4 419 322 598 708 470 377 229 58 102 204 214 464
5 510 390 765 673 465 347 193 52 70 153 212 320
6 416 450 695 688 454 444 179 48 88 151 193 260
7 325 484 580 623 510 476 163 89 151 210 174 251
8 343 325 615 538 614 503 148 144 175 174 140 335
9 394 365 684 558 562 507 253 93 214 150 123 287
10 307 409 707 544 589 451 249 50 229 157 171 241
11 333 336 951 624 733 369 290 45 182 151 189 249
12 343 375 793 821 885 340 242 69 120 133 173 341
13 423 497 726 663 818 591 333 69 144 123 193 334
14 468 429 726 632 879 713 399 44 299 174 237 276
15 381 345 766 610 999 621 395 59 456 151 214 281
16 298 338 788 623 796 584 262 77 327 127 223 274
17 249 457 703 661 655 472 190 53 184 178 190 241
18 254 516 691 661 799 478 299 47 163 216 180 225
19 247 595 859 654 732 538 446 66 183 149 329 187
20 334 591 805 591 535 542 300 118 110 118 309 190
21 296 638 649 565 521 548 241 237 84 111 208 229
22 274 614 556 607 487 567 256 153 90 98 183 348
23 290 730 565 725 476 600 253 203 106 117 213 302
24 338 703 605 633 440 435 173 233 133 130 224 253
25 373 517 595 767 464 438 133 206 149 199 209 313
26 407 432 526 788 535 544 127 160 162 211 220 388
27 348 466 479 731 483 537 165 173 140 222 285 423
28 332 541 542 776 457 411 140 300 153 199 481 562
29 287 231 616 705 469 429 107 238 142 161 424 526
30 289   652 884 488 394 92 162 153 239 295 568
31 322   667   520   101 127   305   549