LOCATION.-- Lat 41°58'27", long 87°42'21" (NAD of 1983), 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 (580.39 ft NAVD 1988). |
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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 2004 TO SEPTEMBER 2005 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 21 | 83 | 276 | 43 | 50 | 180 | 101 | 53 | 33 | 19 | 27 | 26 |
2 | 40 | 266 | 183 | 96 | 48 | 146 | 82 | 51 | 35 | 20 | 23 | 25 |
3 | 37 | 115 | 113 | 130 | 46 | 126 | 74 | 52 | 26 | 18 | 16 | 23 |
4 | 25 | 190 | 85 | 162 | 51 | 108 | 68 | 53 | 39 | 17 | 19 | 22 |
5 | 22 | 176 | 71 | 123 | 70 | 100 | 66 | 55 | 75 | 97 | 19 | 22 |
6 | 22 | 84 | 84 | 99 | 149 | 99 | 65 | 53 | 46 | 63 | 16 | 22 |
7 | 23 | 61 | 315 | 80 | 293 | 127 | 63 | 45 | 32 | 35 | 15 | 23 |
8 | 70 | 50 | 510 | 68 | 412 | 173 | 59 | 51 | 35 | 32 | 13 | 29 |
9 | 105 | 46 | 275 | 60 | 296 | 118 | 57 | 57 | 34 | 28 | 13 | 36 |
10 | 51 | 41 | 176 | 56 | 206 | 93 | 57 | 75 | 35 | 25 | 13 | 28 |
11 | 37 | 37 | 171 | 70 | 158 | 96 | 56 | 91 | 73 | 21 | 16 | 25 |
12 | 34 | 34 | 131 | 352 | 136 | 88 | 95 | 105 | 39 | 21 | 115 | 23 |
13 | 33 | 31 | 93 | 1070 | 160 | 78 | 103 | 75 | 31 | 23 | 86 | 23 |
14 | 30 | 27 | 72 | 997 | 472 | 70 | 70 | 75 | 34 | 29 | 35 | 28 |
15 | 32 | 26 | 62 | 627 | 528 | 67 | 55 | 66 | 39 | 23 | 25 | 30 |
16 | 30 | 29 | 58 | 452 | 439 | 64 | 57 | 60 | 25 | 21 | 22 | 57 |
17 | 26 | 28 | 53 | 340 | 301 | 67 | 56 | 53 | 27 | 18 | 16 | 50 |
18 | 23 | 28 | 49 | 317 | 210 | 76 | 54 | 55 | 26 | 18 | 25 | 33 |
19 | 23 | 70 | 46 | 282 | 172 | 83 | 56 | 223 | 23 | 18 | 76 | 59 |
20 | 24 | 95 | e42 | 182 | 184 | 94 | 56 | 207 | 21 | 71 | 343 | 57 |
21 | 25 | 62 | e38 | 114 | 224 | 89 | 58 | 104 | 21 | 168 | 180 | 33 |
22 | 23 | 47 | e35 | 101 | 193 | 82 | 92 | 75 | 21 | 59 | 64 | 66 |
23 | 182 | 42 | e32 | e96 | 162 | 80 | 126 | 68 | 21 | 37 | 48 | 233 |
24 | 152 | 55 | e30 | e88 | 137 | 79 | 78 | 56 | 19 | 35 | 36 | 74 |
25 | 63 | 140 | e28 | 84 | 118 | 89 | 65 | 45 | 19 | 34 | 38 | 58 |
26 | 50 | 97 | e26 | 74 | 103 | 91 | 62 | 45 | 18 | 119 | 34 | 79 |
27 | 43 | 185 | e23 | 66 | 89 | 78 | 57 | 41 | 18 | 115 | 32 | 88 |
28 | 38 | 290 | e22 | e66 | 153 | 74 | 57 | 40 | 19 | 49 | 32 | 69 |
29 | 58 | 140 | e19 | e62 | --- | 72 | 55 | 41 | 20 | 28 | 29 | 120 |
30 | 42 | 104 | e30 | 49 | --- | 102 | 55 | 34 | 20 | 28 | 27 | 68 |
31 | 36 | --- | 40 | 47 | --- | 191 | --- | 32 | --- | 25 | 27 | --- |
TOTAL | 1420 | 2679 | 3188 | 6453 | 5560 | 3080 | 2055 | 2136 | 924 | 1314 | 1480 | 1529 |
MEAN | 45.8 | 89.3 | 103 | 208 | 199 | 99.4 | 68.5 | 68.9 | 30.8 | 42.4 | 47.7 | 51.0 |
MAX | 182 | 290 | 510 | 1070 | 528 | 191 | 126 | 223 | 75 | 168 | 343 | 233 |
MIN | 21 | 26 | 19 | 43 | 46 | 64 | 54 | 32 | 18 | 17 | 13 | 22 |
CFSM | 0.41 | 0.79 | 0.91 | 1.84 | 1.76 | 0.88 | 0.61 | 0.61 | 0.27 | 0.38 | 0.42 | 0.45 |
IN. | 0.47 | 0.88 | 1.05 | 2.12 | 1.83 | 1.01 | 0.68 | 0.70 | 0.30 | 0.43 | 0.49 | 0.50 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2005, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 101 | 124 | 88.5 | 110 | 151 | 178 | 181 | 206 | 147 | 98.0 | 118 | 82.9 |
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 | 68.5 | 45.0 | 30.8 | 33.0 | 44.6 | 24.1 |
(WY) | 1995 | 2003 | 1990 | 2003 | 2003 | 2003 | 2005 | 1992 | 2005 | 2002 | 2003 | 1994 |
SUMMARY STATISTICS | FOR 2004 CALENDAR YEAR | FOR 2005 WATER YEAR | WATER YEARS 1990 - 2005 | |||
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ANNUAL TOTAL | 45306 | 31818 | ||||
ANNUAL MEAN | 124 | 87.2 | 131 | |||
HIGHEST ANNUAL MEAN | 201 | 1993 | ||||
LOWEST ANNUAL MEAN | 87.2 | 2005 | ||||
HIGHEST DAILY MEAN | 988 | May 23 | 1070 | Jan 13 | 1990 | Feb 22 1997 |
LOWEST DAILY MEAN | 19 | A | 13 | Aug 8-10 | 11 | Oct 11 1992 |
ANNUAL SEVEN-DAY MINIMUM | 21 | Sep 25 | 15 | Aug 5 | 14 | Sep 16 1994 |
MAXIMUM PEAK FLOW | 1200 | Jan 13 | 2360 | Feb 21 1997 | ||
MAXIMUM PEAK STAGE | 5.43 | Jan 13 | 6.81 | Feb 21 1997 | ||
INSTANTANEOUS LOW FLOW | 11 | Aug 8-10 | 3.6 | B | ||
ANNUAL RUNOFF (CFSM) | 1.10 | 0.771 | 1.16 | |||
ANNUAL RUNOFF (INCHES) | 14.91 | 10.47 | 15.79 | |||
10 PERCENT EXCEEDS | 286 | 181 | 304 | |||
50 PERCENT EXCEEDS | 64 | 56 | 68 | |||
90 PERCENT EXCEEDS | 28 | 22 | 27 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |