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 (CR10), in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 100 | 286 | 144 | e32 | 73 | 59 | 93 | 96 | 50 | 34 | 22 | 119 |
2 | 82 | 156 | 96 | e31 | 79 | 71 | 111 | 445 | 45 | 33 | 30 | 173 |
3 | 58 | 140 | 83 | e30 | 60 | 91 | 100 | 428 | 49 | 31 | 20 | 358 |
4 | 63 | 122 | 68 | e29 | 51 | 83 | 89 | 221 | 717 | 32 | 26 | 170 |
5 | 264 | 96 | 61 | e28 | 53 | 76 | 80 | 129 | 956 | 26 | 58 | 116 |
6 | 114 | 107 | 58 | e27 | 58 | 77 | 78 | 110 | 660 | 30 | 33 | 94 |
7 | 64 | 89 | 54 | e27 | 46 | 96 | 92 | 102 | 402 | 34 | 18 | 67 |
8 | 52 | 75 | 48 | e27 | 52 | 277 | 221 | 116 | 281 | 24 | 20 | 51 |
9 | 47 | 61 | 43 | e28 | 63 | 681 | 632 | 177 | 235 | 165 | 20 | 42 |
10 | 47 | 57 | 39 | e28 | 135 | 573 | 571 | 128 | 256 | 72 | 19 | 43 |
11 | 59 | 52 | 39 | e28 | 174 | 319 | 384 | 258 | 265 | 44 | 21 | 45 |
12 | 340 | 49 | 39 | 29 | 126 | 238 | 264 | 1180 | 230 | 35 | 16 | 36 |
13 | 721 | 48 | 116 | 28 | 101 | 196 | 200 | 939 | 142 | 30 | 109 | 33 |
14 | 1600 | 46 | 109 | 28 | 84 | 157 | 163 | 501 | 195 | 21 | 460 | 31 |
15 | 1280 | 45 | 88 | 31 | 75 | 139 | 132 | 347 | 218 | 23 | 241 | 28 |
16 | 936 | 44 | 68 | 33 | 71 | 108 | 116 | 518 | 145 | 23 | 89 | 26 |
17 | 619 | 43 | 84 | 36 | 64 | 88 | 116 | 705 | 119 | 23 | 57 | 29 |
18 | 523 | 41 | 80 | 40 | 57 | 83 | 109 | 418 | 96 | 20 | 37 | 58 |
19 | 488 | 45 | 74 | 48 | 74 | 76 | 99 | 251 | 60 | 22 | 42 | 55 |
20 | 498 | 43 | 78 | 41 | 215 | 72 | 109 | 195 | 61 | 21 | 55 | 137 |
21 | 487 | 41 | 78 | 28 | 283 | 64 | 122 | 140 | 55 | 19 | 32 | 163 |
22 | 370 | 39 | 59 | 29 | 211 | 60 | 168 | 120 | 48 | 19 | 1350 | 118 |
23 | 802 | 35 | 60 | 30 | 150 | 56 | 111 | 92 | 41 | 21 | 1490 | 123 |
24 | 1130 | 40 | 56 | 32 | 119 | 52 | 102 | 74 | 39 | 20 | 833 | 72 |
25 | 1120 | 64 | 51 | 33 | 97 | 49 | 114 | 69 | 61 | 20 | 385 | 55 |
26 | 808 | 54 | e49 | 33 | 84 | 53 | 88 | 71 | 44 | 22 | 262 | 52 |
27 | 573 | 48 | e45 | 31 | 76 | 49 | 110 | 59 | 40 | 43 | 388 | 46 |
28 | 483 | 44 | e43 | 31 | 65 | 45 | 199 | 55 | 37 | 36 | 320 | 39 |
29 | 491 | 53 | e39 | 33 | --- | 99 | 141 | 56 | 38 | 33 | 216 | 79 |
30 | 478 | 134 | e36 | 35 | --- | 178 | 108 | 56 | 36 | 28 | 111 | 104 |
31 | 425 | --- | e34 | 40 | --- | 107 | --- | 53 | --- | 20 | 151 | --- |
TOTAL | 15122 | 2197 | 2019 | 984 | 2796 | 4372 | 5022 | 8109 | 5621 | 1024 | 6931 | 2562 |
MEAN | 487.8 | 73.23 | 65.13 | 31.74 | 99.86 | 141.0 | 167.4 | 261.6 | 187.4 | 33.03 | 223.6 | 85.40 |
MAX | 1600 | 286 | 144 | 48 | 283 | 681 | 632 | 1180 | 956 | 165 | 1490 | 358 |
MIN | 47 | 35 | 34 | 27 | 46 | 45 | 78 | 53 | 36 | 19 | 16 | 26 |
CFSM | 4.32 | 0.65 | 0.58 | 0.28 | 0.88 | 1.25 | 1.48 | 2.31 | 1.66 | 0.29 | 1.98 | 0.76 |
IN. | 4.98 | 0.72 | 0.66 | 0.32 | 0.92 | 1.44 | 1.65 | 2.67 | 1.85 | 0.34 | 2.28 | 0.84 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 117.6 | 128.0 | 88.85 | 114.1 | 162.8 | 189.3 | 203.0 | 195.2 | 156.2 | 97.91 | 131.2 | 94.09 |
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 | 46.9 | 31.3 | 31.7 | 50.3 | 69.9 | 84.1 | 45.0 | 46.0 | 33.0 | 48.3 | 24.1 |
(WY) | 1995 | 1997 | 1990 | 2002 | 1995 | 1996 | 1994 | 1992 | 1992 | 2002 | 1996 | 1994 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1990 - 2002 | |||
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ANNUAL TOTAL | 66927 | 56759 | ||||
ANNUAL MEAN | 183.4 | 155.5 | 139.1 | |||
HIGHEST ANNUAL MEAN | 201 | 1993 | ||||
LOWEST ANNUAL MEAN | 95.2 | 1994 | ||||
HIGHEST DAILY MEAN | 1600 | Oct 14 | 1600 | Oct 14 | 1990 | Feb 22 1997 |
LOWEST DAILY MEAN | 15 | Jul 31,Aug 1 | 16 | Aug 12 | 11 | Oct 11 1992 |
ANNUAL SEVEN-DAY MINIMUM | 30 | Jun 30 | 20 | Jul 18 | 14 | Sep 16 1994 |
MAXIMUM PEAK FLOW | 1800 | Aug 22 | 2360 | Feb 21 1997 | ||
MAXIMUM PEAK STAGE | 6.24 | Aug 22 | 6.81 | Feb 21 1997 | ||
INSTANTANEOUS LOW FLOW | 12 | Aug 12 | 3.6 | A | ||
ANNUAL RUNOFF (CFSM) | 1.62 | 1.38 | 1.23 | |||
ANNUAL RUNOFF (INCHES) | 22.03 | 18.69 | 16.73 | |||
10 PERCENT EXCEEDS | 473 | 421 | 325 | |||
50 PERCENT EXCEEDS | 90 | 71 | 71 | |||
90 PERCENT EXCEEDS | 38 | 28 | 28 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |