LOCATION.-- Lat 41°53'18", long 87°37'16" (NAD of 1927), in NE1/4SW1/4 sec.10, T.39 N., R.14 E., Cook County, Hydrologic Unit 07120003, on left downstream side of bridge within the Columbus Drive bridge structure in Chicago, 0.5 mi downstream from Chicago River Lock and Dam. |
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DRAINAGE AREA.-- Indeterminate. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1996 to current year. |
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GAGE.-- Water-stage recorder, acoustical flowmeter and phone telemeter. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City datum). |
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REMARKS.-- This gaging station provides flow data to determine Illinois' diversion of Lake Michigan water. A U.S. Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft3/s. Illinois' diversion includes water diverted from the lake for domestic water supply, for navigation, and water-quality improvement in the Chicago Sanitary and Ship Canal system, and stormwater runoff from a 673 mi2 diverted watershed area. Estimated daily discharges determined from regression relations between this site and flow data from the Metropolitan Water Reclamation District of Greater Chicago-Chicago River Controlling Works. |
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EXTREMES FOR PERIOD OF RECORD.-- Maximum daily discharge, 1,370 ft3/s, Aug. 6, 1997, minimum daily, -2,450 ft3/s, Feb. 21, 1997, due to regulation to prevent flooding. |
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REMARKS FOR CURRENT YEAR.--Records good except those for estimated daily discharges, which are fair. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 577 | 430 | 54 | -2.8 | 157 | 91 | 154 | 288 | 448 | 658 | 672 | 729 |
2 | 636 | 298 | 9.0 | 60 | 62 | 151 | 164 | 230 | 533 | 648 | 659 | 820 |
3 | 715 | 303 | 61 | 161 | -61 | 72 | 120 | 224 | 397 | 527 | 616 | 691 |
4 | 759 | 303 | 115 | 165 | 81 | -44 | 160 | 272 | 376 | 600 | 316 | 622 |
5 | 628 | 230 | 207 | 372 | 96 | -41 | 119 | 261 | 377 | 580 | 1000 | 652 |
6 | 753 | 214 | 180 | 236 | -89 | 73 | 76 | 330 | 409 | 560 | 1160 | 606 |
7 | 899 | 243 | 159 | 624 | 112 | 91 | 70 | 242 | 395 | 840 | 440 | -87 |
8 | 873 | 289 | 3.5 | 571 | 140 | 212 | 93 | 408 | 347 | 726 | 746 | 466 |
9 | 974 | 313 | 61 | 491 | 42 | 109 | 422 | 285 | 325 | 657 | 720 | 522 |
10 | 791 | 358 | 98 | 94 | 79 | 171 | 104 | 205 | 475 | 738 | 872 | 417 |
11 | 775 | 307 | 187 | -135 | 422 | -72 | 296 | 304 | 530 | 779 | 902 | 536 |
12 | 767 | 299 | 221 | 101 | 295 | 349 | 162 | 285 | 561 | 808 | 826 | 505 |
13 | 586 | 233 | -162 | 236 | 225 | 58 | 360 | 243 | 613 | 990 | 877 | 629 |
14 | 358 | 239 | -168 | -40 | 174 | 282 | 150 | 141 | 424 | 987 | 822 | 611 |
15 | 365 | 250 | 156 | 153 | -0.19 | 173 | 31 | 138 | 619 | 981 | 819 | 449 |
16 | 367 | 309 | 178 | 38 | -59 | 24 | 348 | 301 | 579 | 1010 | 841 | 470 |
17 | 365 | 262 | 50 | 120 | 101 | 18 | 254 | 254 | 572 | 965 | 806 | 499 |
18 | 386 | 102 | 129 | 268 | 129 | 192 | 157 | 553 | 501 | 990 | 891 | 459 |
19 | 381 | 162 | e103 | 129 | -25 | 35 | 90 | 389 | 692 | 860 | 820 | 525 |
20 | 360 | 57 | e78 | -73 | -2.4 | 243 | 188 | 332 | 501 | 912 | 853 | 450 |
21 | 334 | -22 | e52 | 112 | 57 | 1.5 | 192 | 278 | 536 | 873 | 872 | 520 |
22 | 323 | 75 | e27 | 9.3 | 17 | 193 | 188 | 355 | 579 | 904 | 804 | 508 |
23 | 301 | 144 | e1 | 106 | 117 | 141 | 211 | 212 | 581 | 1010 | 791 | 464 |
24 | 283 | 110 | e-25 | 137 | 130 | 67 | 173 | 251 | 556 | 790 | 1030 | 465 |
25 | 284 | 65 | e-50 | 176 | 137 | 92 | 188 | 273 | 669 | 696 | 896 | 490 |
26 | 325 | 88 | e-76 | 148 | 123 | 189 | 280 | 303 | 510 | 693 | 855 | 421 |
27 | 353 | 90 | e-101 | 81 | 136 | 213 | 207 | 308 | 476 | 837 | 743 | 460 |
28 | 326 | 44 | -127 | 53 | 121 | 122 | 144 | 400 | 766 | 858 | e378 | 707 |
29 | 339 | 72 | 80 | 258 | --- | 120 | 89 | 639 | 660 | 660 | e780 | 840 |
30 | 314 | 231 | 41 | -7.3 | --- | 221 | 228 | 282 | 778 | 730 | e815 | 600 |
31 | 387 | --- | -20 | 51 | --- | 491 | --- | 383 | --- | 693 | e613 | --- |
TOTAL | 15884 | 6098 | 1521.5 | 4692.2 | 2716.41 | 4037.5 | 5418 | 9369 | 15785 | 24560 | 24235 | 16046 |
MEAN | 512 | 203 | 49.1 | 151 | 97.0 | 130 | 181 | 302 | 526 | 792 | 782 | 535 |
MAX | 974 | 430 | 221 | 624 | 422 | 491 | 422 | 639 | 778 | 1010 | 1160 | 840 |
MIN | 283 | -22 | -168 | -135 | -89 | -72 | 31 | 138 | 325 | 527 | 316 | -87 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 1998, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 441 | 214 | 176 | 252 | 180 | 203 | 221 | 354 | 559 | 838 | 787 | 687 |
MAX | 512 | 225 | 303 | 352 | 262 | 275 | 262 | 406 | 593 | 883 | 793 | 840 |
(WY) | 1998 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 |
MIN | 369 | 203 | 49.1 | 151 | 97.0 | 130 | 181 | 302 | 526 | 792 | 782 | 535 |
(WY) | 1997 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 | 1998 |
SUMMARY STATISTICS | FOR 1997 CALENDAR YEAR | FOR 1998 WATER YEAR | WATER YEARS 1997 - 1998 | |||
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ANNUAL TOTAL | 165697.5 | 130362.61 | ||||
ANNUAL MEAN | 454 | 357 | ||||
HIGHEST ANNUAL MEAN | ||||||
LOWEST ANNUAL MEAN | ||||||
HIGHEST DAILY MEAN | 1370 | Aug 6 | 1160 | Aug 6 | 1370 | Aug 6 1997 |
LOWEST DAILY MEAN | -2450 A | Feb 21 | -168 | Dec 14 | -2450 A | Feb 21 1997 |
ANNUAL SEVEN-DAY MINIMUM | -108 | Feb 21 | -50 B | Dec 22 | -108 A | Feb 21 1997 |
10 PERCENT EXCEEDS | 882 | 811 | 853 | |||
50 PERCENT EXCEEDS | 375 | 296 | 352 | |||
90 PERCENT EXCEEDS | 100 | 40 | 91 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |