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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EXTREMES FOR CURRENT YEAR.--Maximum daily discharge, 1,370 ft3/s, Aug. 6, minimum daily, -2,450 ft3/s, Feb. 21, 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 1996 TO SEPTEMBER 1997 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | e371 | e197 | e102 | 244 | 450 | 794 | 93 | 372 | 386 | 878 | 910 | 843 |
2 | e354 | e244 | e220 | 193 | 430 | 342 | 178 | 517 | 344 | 873 | 881 | 839 |
3 | e314 | e259 | 231 | 176 | 349 | 217 | 223 | 533 | 372 | 908 | 737 | 830 |
4 | e352 | e237 | 552 | 233 | 117 | 304 | 155 | 387 | 385 | 862 | 986 | 793 |
5 | e470 | e251 | 800 | 264 | 358 | 452 | 181 | 442 | 425 | 842 | 1150 | 836 |
6 | e726 | e669 | 347 | 306 | 583 | 341 | 141 | 386 | 554 | 846 | 1370 | 852 |
7 | e311 | e709 | 340 | 342 | 546 | 261 | 149 | 318 | 391 | 754 | 886 | 833 |
8 | e347 | e205 | 434 | 216 | 416 | 454 | 178 | 539 | 351 | 768 | 856 | 791 |
9 | e343 | e237 | 226 | 224 | 277 | 348 | 249 | 362 | 427 | 864 | 906 | 771 |
10 | e311 | e213 | 164 | 326 | 368 | 429 | 231 | 369 | 373 | 852 | 897 | 885 |
11 | e336 | e205 | 137 | 260 | 554 | 282 | 220 | 400 | 453 | 846 | 785 | 796 |
12 | e371 | e188 | 281 | 512 | 263 | 257 | 389 | 374 | 547 | 883 | 684 | 919 |
13 | e378 | e229 | 354 | 466 | 110 | 228 | 266 | 335 | 520 | 901 | 901 | 905 |
14 | e349 | e205 | 184 | 411 | 320 | 348 | 270 | 359 | 429 | 975 | 874 | 856 |
15 | e378 | e152 | 272 | 394 | 502 | 304 | 316 | 344 | 444 | 964 | 804 | 757 |
16 | e585 | e213 | 170 | 551 | 509 | 379 | 295 | 394 | 462 | 950 | -711 | 1130 |
17 | e437 | e171 | 323 | 567 | 401 | 371 | 300 | 375 | 328 | 915 | 595 | 804 |
18 | e326 | e188 | 228 | 423 | 315 | 236 | 260 | 492 | 378 | 957 | 564 | 1250 |
19 | e376 | e152 | 362 | 333 | 430 | 219 | 292 | 749 | 408 | 998 | 534 | 909 |
20 | e361 | e123 | 334 | 555 | 449 | 123 | 257 | 354 | 706 | 1040 | 745 | 977 |
21 | e295 | e180 | 182 | 393 | -2450 | 163 | 267 | 360 | 1310 | 777 | 925 | 904 |
22 | e595 | e143 | 273 | 386 | 124 | 138 | 323 | 361 | 785 | 829 | 895 | 678 |
23 | e264 | e171 | 302 | 215 | 338 | 74 | 340 | 403 | 963 | 873 | 802 | 616 |
24 | e298 | e133 | 311 | 80 | 383 | 328 | 297 | 366 | 1190 | 868 | 808 | 586 |
25 | e311 | e162 | 292 | 306 | 340 | 377 | 293 | 402 | 709 | 873 | 842 | 780 |
26 | e358 | e162 | 251 | 292 | 141 | 119 | 335 | 340 | 930 | 836 | 836 | 850 |
27 | e365 | e229 | 319 | 418 | 365 | 137 | 326 | 275 | 853 | 830 | 807 | 843 |
28 | e309 | e309 | 376 | 537 | 360 | 96 | 269 | 305 | 838 | 1020 | 836 | 785 |
29 | e338 | e112 | 328 | 460 | --- | 189 | 413 | 450 | 841 | 857 | 851 | 851 |
30 | e245 | e102 | 385 | 450 | --- | 98 | 359 | 511 | 676 | 851 | 774 | 731 |
31 | e267 | --- | 301 | 372 | --- | 129 | --- | 418 | --- | 894 | 855 | --- |
TOTAL | 11441 | 6750 | 9381 | 10905 | 7348 | 8537 | 7865 | 12592 | 17778 | 27384 | 24585 | 25200 |
MEAN | 369 | 225 | 303 | 352 | 262 | 275 | 262 | 406 | 593 | 883 | 793 | 840 |
MAX | 726 | 709 | 800 | 567 | 583 | 794 | 413 | 749 | 1310 | 1040 | 1370 | 1250 |
MIN | 245 | 102 | 102 | 80 | -2450 | 74 | 93 | 275 | 328 | 754 | -711 | 586 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 1997, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 369 | 225 | 303 | 352 | 262 | 275 | 262 | 406 | 593 | 883 | 793 | 840 |
MAX | 369 | 225 | 303 | 352 | 262 | 275 | 262 | 406 | 593 | 883 | 793 | 840 |
(WY) | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 |
MIN | 369 | 225 | 303 | 352 | 262 | 275 | 262 | 406 | 593 | 883 | 793 | 840 |
(WY) | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 | 1997 |
SUMMARY STATISTICS | FOR 1997 WATER YEAR | |||||
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ANNUAL TOTAL | 169766 | |||||
ANNUAL MEAN | 465 | |||||
HIGHEST DAILY MEAN | 1370 | Aug 6 | ||||
LOWEST DAILY MEAN | -2450 A | Feb 21 | ||||
ANNUAL SEVEN-DAY MINIMUM | -108 A | Feb 21 | ||||
10 PERCENT EXCEEDS | 876 | |||||
50 PERCENT EXCEEDS | 373 | |||||
90 PERCENT EXCEEDS | 177 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |