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 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 68 | 27 | 36 | 28 | e40 | e23 | 58 | 994 | 148 | 32 | 51 | 56 |
2 | 80 | 26 | 33 | 26 | e48 | e23 | 52 | 972 | 100 | 30 | 73 | 43 |
3 | 84 | 28 | 36 | 27 | e50 | e25 | 51 | 614 | 94 | 29 | 296 | 28 |
4 | 150 | 27 | 38 | 26 | e52 | e27 | 333 | 439 | 75 | 30 | 151 | 22 |
5 | 265 | 26 | 36 | 26 | e49 | e28 | 624 | 808 | 58 | 123 | 57 | 21 |
6 | 101 | 32 | 46 | 27 | e45 | e29 | 377 | 738 | 62 | 195 | 45 | 19 |
7 | 70 | 36 | 48 | 29 | e43 | e31 | 245 | 508 | 59 | 432 | 42 | 19 |
8 | 66 | 29 | 42 | 28 | e41 | e32 | 243 | 280 | 75 | 399 | 41 | 19 |
9 | 58 | 29 | 46 | 29 | e37 | e31 | 215 | 802 | 112 | 342 | 59 | 19 |
10 | 63 | 32 | 63 | 28 | e27 | e30 | 260 | 754 | 71 | 286 | 39 | 19 |
11 | 58 | 30 | 49 | 30 | e29 | e34 | 204 | 713 | 61 | 198 | 36 | 19 |
12 | 49 | 37 | 34 | e34 | e28 | e48 | 148 | 714 | 52 | 148 | 33 | 17 |
13 | 41 | 36 | 30 | e28 | e29 | e60 | 110 | 554 | 53 | 95 | 29 | 20 |
14 | 38 | 32 | 27 | e26 | e28 | e70 | 88 | 410 | 52 | 73 | 28 | 59 |
15 | 39 | 39 | 28 | e32 | e27 | 101 | 76 | 445 | 48 | 330 | 29 | 116 |
16 | 45 | 35 | 27 | e30 | e26 | 106 | 66 | 291 | 47 | 276 | 30 | 54 |
17 | 31 | 34 | 27 | e29 | e26 | 93 | 59 | 208 | 49 | 230 | 34 | 41 |
18 | 41 | 37 | 156 | e31 | e26 | 79 | 54 | 170 | 64 | 303 | 24 | 31 |
19 | 33 | 52 | 242 | e30 | e26 | 68 | 49 | 135 | 93 | 140 | 24 | 27 |
20 | 28 | 60 | 118 | e29 | e25 | 82 | 49 | 117 | 67 | 93 | 24 | 23 |
21 | 25 | 55 | 77 | e29 | e25 | 102 | 45 | 109 | 54 | 213 | 25 | 20 |
22 | 25 | 73 | 59 | e30 | e25 | 92 | 43 | 90 | 47 | 99 | 23 | 36 |
23 | 25 | 57 | 45 | e31 | e24 | 74 | 40 | 74 | 43 | 76 | 21 | 34 |
24 | 26 | 48 | 41 | e30 | e23 | 65 | 32 | 67 | 50 | 63 | 19 | 29 |
25 | 43 | 42 | 38 | e29 | e23 | 73 | 37 | e64 | 41 | 56 | 19 | 24 |
26 | 50 | 39 | 33 | e28 | e22 | 79 | 35 | e63 | 47 | 49 | 25 | 38 |
27 | 37 | 39 | 39 | e27 | e22 | 67 | 33 | 62 | 31 | 43 | 24 | 79 |
28 | 32 | 39 | 30 | e26 | e22 | 87 | 33 | 93 | 31 | 39 | 21 | 47 |
29 | 30 | 37 | 28 | e24 | --- | 135 | 35 | 314 | 31 | 38 | 21 | 34 |
30 | 29 | 37 | 28 | e30 | --- | 85 | 150 | 179 | 35 | 36 | 20 | 30 |
31 | 29 | --- | 30 | e34 | --- | 65 | --- | 178 | --- | 32 | 20 | --- |
TOTAL | 1759 | 1150 | 1610 | 891 | 888 | 1944 | 3844 | 11959 | 1850 | 4528 | 1383 | 1043 |
MEAN | 56.7 | 38.3 | 51.9 | 28.7 | 31.7 | 62.7 | 128 | 386 | 61.7 | 146 | 44.6 | 34.8 |
MAX | 265 | 73 | 242 | 34 | 52 | 135 | 624 | 994 | 148 | 432 | 296 | 116 |
MIN | 25 | 26 | 27 | 24 | 22 | 23 | 32 | 62 | 31 | 29 | 19 | 17 |
CFSM | 0.50 | 0.34 | 0.46 | 0.25 | 0.28 | 0.55 | 1.13 | 3.41 | 0.55 | 1.29 | 0.39 | 0.31 |
IN. | 0.58 | 0.38 | 0.53 | 0.29 | 0.29 | 0.64 | 1.27 | 3.94 | 0.61 | 1.49 | 0.46 | 0.34 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 113 | 121 | 86.0 | 107 | 152 | 179 | 197 | 211 | 148 | 102 | 125 | 89.5 |
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 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1990 - 2003 | |||
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ANNUAL TOTAL | 41940 | 32849 | ||||
ANNUAL MEAN | 115 | 90.0 | 135 | |||
HIGHEST ANNUAL MEAN | 201 | 1993 | ||||
LOWEST ANNUAL MEAN | 90.0 | 2003 | ||||
HIGHEST DAILY MEAN | 1490 | Aug 23 | 994 | May 1 | 1990 | Feb 22 1997 |
LOWEST DAILY MEAN | 16 | Aug 12 | 17 | Sep 12 | 11 | Oct 11 1992 |
ANNUAL SEVEN-DAY MINIMUM | 20 | Jul 18 | 19 | Sep 6 | 14 | Sep 16 1994 |
MAXIMUM PEAK FLOW | 1130 | May 1 | 2360 | Feb 21 1997 | ||
MAXIMUM PEAK STAGE | 5.31 | May 1 | 6.81 | Feb 21 1997 | ||
INSTANTANEOUS LOW FLOW | 15 | A | 3.6 | B | ||
ANNUAL RUNOFF (CFSM) | 1.02 | 0.80 | 1.20 | |||
ANNUAL RUNOFF (INCHES) | 13.81 | 10.81 | 16.24 | |||
10 PERCENT EXCEEDS | 253 | 210 | 319 | |||
50 PERCENT EXCEEDS | 55 | 41 | 69 | |||
90 PERCENT EXCEEDS | 27 | 25 | 28 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |