LOCATION.-- Lat 42°20'39", long 87°56'18" (NAD of 1927), in SE1/4SW1/4 sec.27, T.45 N., R.11 E., Lake County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on State Highway 120, 2.5 mi southwest of Gurnee, and at mile 94.2. |
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DRAINAGE AREA.-- 232 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1945 to September 1958, October 1968 to current year. |
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STAGE: Water years 1994-2002. |
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PARTIAL RECORD: Annual maximum, water years 1960-68. |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1977-91. |
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PRECIPITATION: October 1999 to current year. |
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REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-76-1: 1960(M), 1962(M). WDR IL-77-1: 1971. |
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GAGE.-- Water-stage recorder, phone telemeter, and rain gage. Datum of gage is 650.30 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark). Prior to May 26, 1946, nonrecording gage. May 27, 1946, to Sept. 30, 1958, water-stage recorder. Dec. 17, 1959, to September 1968, crest-stage gage. October 1968 to September 1998, water stage recorder at site 800 ft upstream at same datum. |
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REMARKS.-- Effluent from sewage-treatment plants, 0.5 mi upstream. Collection, computation, and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Precipitation data could be subject to error for days with freezing and/or thawing of precipitation. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,530 ft3/s, Sept. 27, 1986, gage height, 11.95 ft; no flow Sept. 26 to Oct. 19, 1956, and part of each day Aug. 27-30, Sept. 1, 2, 1970. |
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PRECIPITATION: Maximum daily total, 2.76 in., Oct. 13, 2001. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plants averaged 57.2 ft3/s. The maximum monthly effluent was 73.4 ft3/s in October, and the minimum was 44.3 ft3/s in September. |
DISCHARGE, 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 | 115 | 716 | 203 | e76 | 88 | 208 | 144 | 234 | 93 | 52 | 27 | 38 |
2 | 104 | 650 | 211 | e76 | 95 | 193 | 154 | 240 | 82 | 44 | 27 | 77 |
3 | 94 | 563 | 213 | e77 | 96 | 172 | 156 | 209 | 89 | 41 | 26 | 95 |
4 | 90 | 482 | 212 | 78 | 86 | 159 | 159 | 186 | 326 | 37 | 27 | 129 |
5 | 101 | 400 | 198 | 78 | 90 | 172 | 158 | 168 | 531 | 34 | 28 | 124 |
6 | 88 | 298 | 185 | 79 | 93 | 168 | 153 | 159 | 644 | 34 | 26 | 96 |
7 | 80 | 226 | 170 | 80 | 83 | 164 | 155 | 148 | 663 | 34 | 26 | 72 |
8 | 76 | 197 | 159 | 78 | 88 | 240 | 243 | 141 | 669 | 34 | 25 | 59 |
9 | 70 | 180 | 148 | 78 | 97 | 399 | 482 | 150 | 669 | 50 | 24 | 51 |
10 | 73 | 171 | 141 | 81 | 130 | 463 | 617 | 138 | 656 | 43 | 25 | 42 |
11 | 81 | 159 | 135 | 83 | 167 | 493 | 683 | 149 | 632 | 51 | 25 | 39 |
12 | 121 | 148 | 133 | 83 | 202 | 497 | 705 | 333 | 602 | 45 | 26 | 37 |
13 | 322 | 135 | 175 | 82 | 206 | 492 | 726 | 337 | 561 | 39 | 58 | 38 |
14 | 777 | 143 | 181 | 83 | 192 | 483 | 729 | 336 | 504 | 34 | 56 | 38 |
15 | 767 | 178 | 186 | 84 | 172 | 472 | 705 | 313 | 441 | 32 | 44 | 35 |
16 | 680 | 212 | 179 | 85 | 158 | 451 | 651 | 287 | 355 | 30 | 43 | 34 |
17 | 610 | 237 | 178 | 81 | 146 | 419 | 580 | 274 | 261 | 29 | 38 | 32 |
18 | 570 | 229 | 183 | 80 | 136 | 377 | 510 | 256 | 192 | 27 | 33 | 39 |
19 | 535 | 212 | 176 | 82 | 140 | 320 | 468 | 237 | 160 | 27 | 33 | 59 |
20 | 489 | 192 | 171 | 78 | 191 | 261 | 458 | 211 | 152 | 27 | 30 | 73 |
21 | 438 | 174 | 161 | 63 | 277 | 216 | 441 | 187 | 145 | 29 | 33 | 85 |
22 | 389 | 161 | 155 | 61 | 313 | 193 | 408 | 166 | 128 | 29 | 162 | 82 |
23 | 675 | 148 | 154 | 64 | 325 | 173 | 366 | 146 | 109 | 27 | 97 | 65 |
24 | 835 | 148 | 146 | 66 | 325 | 159 | 327 | 138 | 95 | 27 | 94 | 54 |
25 | 951 | 153 | 120 | 66 | 317 | 148 | 300 | 148 | 81 | 26 | 83 | 47 |
26 | 976 | 144 | e110 | 70 | 305 | 136 | 271 | 135 | 93 | 28 | 78 | 42 |
27 | 929 | 134 | e100 | 71 | 282 | 141 | 241 | 128 | 76 | 31 | 64 | 38 |
28 | 887 | 140 | e94 | 73 | 243 | 126 | 237 | 122 | 67 | 31 | 49 | 35 |
29 | 856 | 135 | e90 | 74 | --- | 142 | 231 | 121 | 64 | 32 | 47 | 74 |
30 | 813 | 174 | e84 | 74 | --- | 149 | 227 | 115 | 61 | 30 | 43 | 57 |
31 | 769 | --- | e81 | 72 | --- | 146 | --- | 104 | --- | 28 | 41 | --- |
TOTAL | 14361 | 7239 | 4832 | 2356 | 5043 | 8332 | 11685 | 6016 | 9201 | 1062 | 1438 | 1786 |
MEAN | 463.3 | 241.3 | 155.9 | 76.00 | 180.1 | 268.8 | 389.5 | 194.1 | 306.7 | 34.26 | 46.39 | 59.53 |
MAX | 976 | 716 | 213 | 85 | 325 | 497 | 729 | 337 | 669 | 52 | 162 | 129 |
MIN | 70 | 134 | 81 | 61 | 83 | 126 | 144 | 104 | 61 | 26 | 24 | 32 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1977 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 137.3 | 184.2 | 232.2 | 165.7 | 261.1 | 437.3 | 500.8 | 302.7 | 234.7 | 146.9 | 126.9 | 133.7 |
MAX | 1011 | 785 | 865 | 514 | 626 | 1510 | 1395 | 847 | 1123 | 599 | 648 | 756 |
(WY) | 1987 | 1986 | 1983 | 1993 | 2001 | 1979 | 1993 | 1996 | 2000 | 1993 | 1978 | 1986 |
MIN | 16.6 | 16.5 | 12.7 | 10.6 | 11.9 | 61.8 | 79.9 | 31.3 | 23.1 | 23.9 | 15.0 | 18.3 |
(WY) | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1977 - 2002 | |||
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ANNUAL TOTAL | 104802.0 | 73351 | ||||
ANNUAL MEAN | 287.1 | 201.0 | 238.2 | |||
HIGHEST ANNUAL MEAN | 428 | 1993 | ||||
LOWEST ANNUAL MEAN | 26.8 | 1977 | ||||
HIGHEST DAILY MEAN | 1120 | Feb 14 | 976 | Oct 26 | 3470 | Sep 27 1986 |
LOWEST DAILY MEAN | 38 A | Aug 13 | 24 | Aug 9 | 7.5 | Feb 6 1977 |
ANNUAL SEVEN-DAY MINIMUM | 49 | Aug 9 | 25 | Aug 6 | 7.9 | Jan 31 1977 |
MAXIMUM PEAK FLOW | 989 | Oct 26 | 3530 | Sep 27 1986 | ||
MAXIMUM PEAK STAGE | 6.61 | Oct 26 | 11.95 | Sep 27 1986 | ||
INSTANTANEOUS LOW FLOW | 17 | Aug 11 | ||||
10 PERCENT EXCEEDS | 644 | 506 | 578 | |||
50 PERCENT EXCEEDS | 205 | 141 | 125 | |||
90 PERCENT EXCEEDS | 64 | 34 | 43 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |