LOCATION.-- Lat 41°58'27", long 87°42'22" (NAD of 1927), in NW1/4SW1/4 sec.12, T.40 N., R.13 E., Cook County, Hydrologic Unit 07120003, on right downstream side of bridge in West River Park in Chicago, 0.1 mi upstream from North Shore Channel, and at mile 43.4. |
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DRAINAGE AREA.-- 113 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1989 to September 1998; June 2000 to current year. |
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STAGE: October 1994 to September 1998, June 2000 to current year. |
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GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 580.67 ft above NGVD of 1929. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,360 ft3/s, Feb. 21, 1997, gage height 6.81 ft; minimum discharge, 3.6 ft3/s, Aug. 5,6, 1993. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are 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 | 28 | 23 | 63 | 43 | e50 | 162 | 245 | 79 | 737 | 69 | 37 | 48 |
2 | 27 | 69 | 56 | 40 | e55 | 266 | 198 | 79 | 585 | 63 | 34 | 39 |
3 | 36 | 438 | 46 | 43 | e58 | 203 | 163 | 68 | 342 | 152 | 38 | 40 |
4 | 61 | 504 | 40 | 45 | e60 | 173 | 132 | 66 | 241 | 292 | 455 | 37 |
5 | 39 | 615 | 94 | 46 | e58 | 744 | 113 | 55 | 212 | 199 | 220 | 33 |
6 | 30 | 448 | 84 | 37 | e60 | 799 | 102 | 62 | 177 | 117 | 80 | 30 |
7 | 28 | 213 | 56 | 68 | e62 | 557 | 89 | 57 | 154 | 98 | 62 | 30 |
8 | 27 | 147 | 49 | 72 | e54 | 399 | 78 | 47 | 171 | 83 | 56 | 30 |
9 | 25 | 101 | 50 | 52 | e48 | 285 | 73 | 44 | 178 | 92 | 50 | 27 |
10 | 25 | 85 | 314 | 46 | e41 | 212 | 69 | 50 | 409 | 429 | 46 | 26 |
11 | 26 | 78 | 509 | e42 | e34 | 168 | 61 | 71 | 653 | 318 | 42 | 27 |
12 | 23 | 75 | 317 | 39 | e29 | 141 | 57 | 60 | 615 | 152 | 41 | 29 |
13 | 25 | 62 | 193 | e37 | e28 | 122 | 57 | 156 | 430 | 114 | 43 | 26 |
14 | 169 | 51 | 147 | 39 | e27 | 121 | 58 | 261 | 319 | 97 | 40 | 26 |
15 | 193 | 50 | 111 | 38 | e29 | 111 | 52 | 347 | 253 | 77 | 37 | 27 |
16 | 70 | 50 | 89 | e37 | e33 | 102 | 56 | 198 | 191 | 72 | 35 | 35 |
17 | 49 | 48 | 73 | 36 | e31 | 99 | 78 | 130 | 155 | 66 | 47 | 33 |
18 | 43 | 337 | 64 | e36 | 65 | 104 | 87 | 327 | 128 | 58 | 50 | 29 |
19 | 38 | 472 | 56 | e36 | 88 | 97 | 74 | 445 | 116 | 54 | 79 | 26 |
20 | 34 | 237 | 49 | e37 | 136 | 95 | 74 | 333 | 101 | 52 | 46 | 25 |
21 | 34 | 155 | 50 | e36 | 237 | 75 | 138 | 575 | 168 | 49 | 37 | 27 |
22 | 33 | 103 | 44 | e34 | 135 | 64 | 112 | 894 | 270 | 99 | 38 | 26 |
23 | 32 | 116 | 43 | e34 | 140 | 62 | 87 | 988 | 202 | 76 | 36 | 24 |
24 | 31 | 231 | 42 | e35 | 196 | 100 | 85 | 729 | 144 | 76 | 157 | 24 |
25 | 53 | 189 | 39 | e38 | 214 | 144 | 158 | 559 | 123 | 60 | 200 | 22 |
26 | 43 | 153 | 36 | e41 | 191 | 225 | 128 | 380 | 100 | 56 | 70 | 19 |
27 | 31 | 128 | 35 | e45 | 169 | 325 | 103 | 240 | 85 | 48 | 80 | 20 |
28 | 28 | 114 | 43 | e46 | 147 | 272 | 90 | 187 | 81 | 41 | 561 | 21 |
29 | 26 | 95 | 48 | e47 | 137 | 530 | 83 | 153 | 75 | 42 | 227 | 21 |
30 | 25 | 77 | 46 | e48 | --- | 533 | 79 | 368 | 70 | 42 | 87 | 20 |
31 | 23 | --- | 46 | e49 | --- | 361 | --- | 741 | --- | 40 | 60 | --- |
TOTAL | 1355 | 5464 | 2932 | 1322 | 2612 | 7651 | 2979 | 8749 | 7485 | 3283 | 3091 | 847 |
MEAN | 43.7 | 182 | 94.6 | 42.6 | 90.1 | 247 | 99.3 | 282 | 250 | 106 | 99.7 | 28.2 |
MAX | 193 | 615 | 509 | 72 | 237 | 799 | 245 | 988 | 737 | 429 | 561 | 48 |
MIN | 23 | 23 | 35 | 34 | 27 | 62 | 52 | 44 | 70 | 40 | 34 | 19 |
CFSM | 0.39 | 1.61 | 0.84 | 0.38 | 0.80 | 2.18 | 0.88 | 2.50 | 2.21 | 0.94 | 0.88 | 0.25 |
IN. | 0.45 | 1.80 | 0.97 | 0.44 | 0.86 | 2.52 | 0.98 | 2.88 | 2.46 | 1.08 | 1.02 | 0.28 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 108 | 125 | 86.6 | 102 | 147 | 184 | 189 | 217 | 156 | 102 | 123 | 85.1 |
MAX | 488 | 266 | 175 | 280 | 394 | 288 | 514 | 446 | 332 | 189 | 342 | 247 |
(WY) | 2002 | 1991 | 1992 | 1993 | 1997 | 1993 | 1993 | 1996 | 1996 | 1993 | 1990 | 2001 |
MIN | 38.7 | 38.3 | 31.3 | 28.7 | 31.7 | 62.7 | 84.1 | 45.0 | 46.0 | 33.0 | 44.6 | 24.1 |
(WY) | 1995 | 2003 | 1990 | 2003 | 2003 | 2003 | 1994 | 1992 | 1992 | 2002 | 2003 | 1994 |
SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1990 - 2004 | |||
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ANNUAL TOTAL | 38081 | 47770 | ||||
ANNUAL MEAN | 104 | 131 | 135 | |||
HIGHEST ANNUAL MEAN | 201 | 1993 | ||||
LOWEST ANNUAL MEAN | 90.0 | 2003 | ||||
HIGHEST DAILY MEAN | 994 | May 1 | 988 | May 23 | 1990 | Feb 22 1997 |
LOWEST DAILY MEAN | 17 | Sep 12 | 19 | Sep 26 | 11 | Oct 11 1992 |
ANNUAL SEVEN-DAY MINIMUM | 19 | Sep 6 | 21 | Sep 24 | 14 | Sep 16 1994 |
MAXIMUM PEAK FLOW | 1030 | May 23 | 2360 | Feb 21 1997 | ||
MAXIMUM PEAK STAGE | 5.12 | May 23 | 6.81 | Feb 21 1997 | ||
INSTANTANEOUS LOW FLOW | 17 | Sep 26 | 3.6 | A | ||
ANNUAL RUNOFF (CFSM) | 0.923 | 1.16 | 1.19 | |||
ANNUAL RUNOFF (INCHES) | 12.54 | 15.73 | 16.20 | |||
10 PERCENT EXCEEDS | 278 | 326 | 319 | |||
50 PERCENT EXCEEDS | 48 | 68 | 69 | |||
90 PERCENT EXCEEDS | 24 | 29 | 28 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |