LOCATION.-- Lat 41°53'30", long 87°38'30" (NAD of 1927), in NW1/4SW1/4 sec.12, T.40 N., R.13 E., Cook County, Hydrologic Unit 07120003, on right upstream side of Grand Avenue bridge in Chicago, 0.6 mi upstream from the confluence with the main stem of the Chicago River and at mile 36.0. |
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DRAINAGE AREA.-- 180 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: July 2, 2002 to current year. |
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SURFACE-WATER QUALITY |
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PHYSICAL AND CHEMICAL: Water years 2002 to current year. |
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WATER TEMPERATURE: September 2002 to current year. |
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GAGE.-- Water-stage recorder, acoustic velocity meter and water-temperature sensor. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City datum). |
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REMARKS.-- This station provides data for a water-quality model. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum daily discharge, 4,430 ft3/s, Aug. 22, 2002, minimum daily discharge, -20 ft3/s, Jan. 31, 2004, due to regulation. |
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WATER TEMPERATURE: Maximum recorded, 25.6°C, Aug. 27, 2003; minimum recorded, 0.5°C, Jan. 31, 2004. |
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REMARKS FOR CURRENT YEAR.-- Records poor. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 344 | 323 | 418 | 344 | 172 | 645 | 617 | 376 | 1250 | 602 | 542 | 634 |
2 | 315 | 632 | 364 | 336 | 189 | 692 | 603 | 397 | 915 | 556 | 618 | 595 |
3 | 470 | 1210 | 321 | 339 | 394 | 574 | 484 | 402 | 816 | 918 | 648 | 600 |
4 | 352 | 1550 | 427 | 281 | 324 | 804 | 459 | 325 | 633 | 892 | 1260 | 575 |
5 | 394 | 1670 | 548 | 371 | 136 | 2000 | 473 | 373 | 725 | 724 | 885 | 591 |
6 | 326 | 893 | 377 | 421 | 235 | 1220 | 528 | 366 | 580 | 612 | 666 | 543 |
7 | 327 | 651 | 400 | 35 | 200 | 1050 | 404 | 369 | 638 | 642 | 656 | 545 |
8 | 363 | 398 | 402 | 67 | 187 | 697 | 487 | 387 | 623 | 666 | 668 | 597 |
9 | 361 | 447 | 478 | 319 | 299 | 613 | 410 | 347 | 630 | 709 | 581 | 602 |
10 | 357 | 474 | 973 | 290 | 333 | 665 | 395 | 445 | 1250 | 903 | 633 | 648 |
11 | 392 | 398 | 985 | 324 | 276 | 536 | 379 | 467 | 1840 | 871 | 596 | 577 |
12 | 331 | 497 | 658 | 359 | 344 | 442 | 426 | 527 | 1430 | 699 | 605 | 528 |
13 | 339 | 345 | 429 | 406 | 343 | 432 | 346 | 714 | 790 | 624 | 640 | 593 |
14 | 842 | 436 | 518 | 337 | 291 | 610 | 446 | 847 | 909 | 609 | 625 | 551 |
15 | 594 | 323 | 421 | 376 | 258 | 457 | 376 | 741 | 751 | 673 | 589 | 573 |
16 | 460 | 368 | 492 | 328 | 335 | 434 | 405 | 565 | 694 | 594 | 601 | 423 |
17 | 332 | 476 | 401 | 339 | 324 | 494 | 524 | 559 | 526 | 620 | 580 | 366 |
18 | 315 | 1520 | 431 | 331 | 358 | 519 | 378 | 788 | 680 | 647 | 565 | 317 |
19 | 326 | 922 | 364 | 259 | 376 | 442 | 429 | 840 | 536 | 631 | 609 | 285 |
20 | 407 | 700 | 344 | 108 | 641 | 599 | 519 | 858 | 605 | 598 | 480 | 360 |
21 | 305 | 517 | 395 | 322 | 570 | 418 | 518 | 1270 | 753 | 497 | 606 | 382 |
22 | 348 | 437 | 337 | 331 | 456 | 435 | 390 | 1780 | 712 | 656 | 503 | 325 |
23 | 297 | 633 | 326 | 302 | 485 | 379 | 478 | 1820 | 565 | 572 | 614 | 425 |
24 | 444 | 764 | 306 | 251 | 563 | 671 | 373 | 1310 | 574 | 624 | 848 | 363 |
25 | 413 | 596 | 302 | 397 | 548 | 610 | 552 | 1040 | 562 | 553 | 806 | 290 |
26 | 358 | 418 | 329 | 236 | 528 | 820 | 463 | 816 | 630 | 642 | 470 | 345 |
27 | 338 | 448 | 296 | 272 | 486 | 751 | 375 | 677 | 610 | 567 | 783 | 343 |
28 | 392 | 494 | 373 | 246 | 495 | 775 | 381 | 572 | 504 | 641 | 2760 | 295 |
29 | 295 | 457 | 372 | 261 | 429 | 1100 | 396 | 502 | 595 | 614 | 777 | 347 |
30 | 311 | 398 | 324 | 136 | --- | 1090 | 376 | 1470 | 608 | 460 | 753 | 322 |
31 | 289 | --- | 319 | -20 | --- | 710 | --- | 1610 | --- | 582 | 691 | --- |
TOTAL | 11737 | 19395 | 13430 | 8704 | 10575 | 21684 | 13390 | 23560 | 22934 | 20198 | 22658 | 13940 |
MEAN | 379 | 646 | 433 | 281 | 365 | 699 | 446 | 760 | 764 | 652 | 731 | 465 |
MAX | 842 | 1670 | 985 | 421 | 641 | 2000 | 617 | 1820 | 1840 | 918 | 2760 | 648 |
MIN | 289 | 323 | 296 | -20 | 136 | 379 | 346 | 325 | 504 | 460 | 470 | 285 |
CFSM | 2.11 | 3.60 | 2.41 | 1.56 | 2.03 | 3.90 | 2.49 | 4.24 | 4.26 | 3.63 | 4.07 | 2.59 |
IN. | 2.43 | 4.02 | 2.78 | 1.80 | 2.19 | 4.50 | 2.78 | 4.88 | 4.75 | 4.19 | 4.70 | 2.89 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 2002 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 394 | 504 | 408 | 301 | 335 | 542 | 500 | 902 | 764 | 652 | 775 | 466 |
MAX | 409 | 646 | 433 | 321 | 365 | 699 | 553 | 1045 | 764 | 652 | 820 | 467 |
(WY) | 2003 | 2004 | 2004 | 2003 | 2004 | 2004 | 2003 | 2003 | 2004 | 2004 | 2002 | 2003 |
MIN | 379 | 361 | 382 | 281 | 304 | 385 | 446 | 760 | 764 | 652 | 731 | 465 |
(WY) | 2004 | 2003 | 2003 | 2004 | 2003 | 2003 | 2004 | 2004 | 2004 | 2004 | 2004 | 2004 |
SUMMARY STATISTICS | FOR 2004 WATER YEAR | WATER YEARS 2002 - 2004 | ||||
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ANNUAL TOTAL | 202205 | |||||
ANNUAL MEAN | 552 | |||||
HIGHEST DAILY MEAN | 2760 | Aug 28 | 4430 | Aug 22 2002 | ||
LOWEST DAILY MEAN | -20 | Jan 31 | -20 | Jan 31 2004 | ||
ANNUAL SEVEN-DAY MINIMUM | 179 | Jan 27 | 179 | Jan 27 2004 | ||
MAXIMUM PEAK FLOW | 7550 | Aug 28 | 14100 | Aug 22 2002 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |