LOCATION.-- Lat 42°20'39", long 87°56'18" (NAD of 1983), 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 to current year. |
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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) (650.00 ft NAVD 1988). 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, 3,890 ft3/s, May 25, 2004, gage height, 11.76 ft; maximum gage height, 11.95 ft, Sept. 27, 1986; 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 discharges, which are poor. Effluent from sewage-treatment plants averaged 50.2 ft3/s. The maximum monthly effluent was 64.2 ft3/s in February, and the minimum was 41.1 ft3/s in September. |
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 | 42 | 93 | 156 | 83 | 136 | 365 | 239 | 93 | 75 | 33 | 36 | 41 |
2 | 48 | 129 | 144 | 121 | 132 | 338 | 239 | 90 | 70 | 31 | 34 | 40 |
3 | 45 | 128 | 136 | 135 | 128 | 308 | 257 | 84 | 65 | 31 | 33 | 40 |
4 | 44 | 143 | 126 | 144 | 134 | 286 | 278 | 82 | 69 | 47 | 34 | 40 |
5 | 44 | 123 | 120 | 136 | 153 | 281 | 295 | 78 | 76 | 45 | 33 | 41 |
6 | 42 | 108 | 142 | 104 | 198 | 300 | 306 | 76 | 75 | 35 | 32 | 41 |
7 | 41 | 94 | 258 | e95 | 323 | 382 | 307 | 87 | 78 | 34 | 33 | 41 |
8 | 50 | 85 | 364 | e90 | 453 | 475 | 300 | 78 | 76 | 33 | 34 | 42 |
9 | 46 | 78 | 397 | e90 | 504 | 530 | 281 | 83 | 71 | 33 | 34 | 40 |
10 | 44 | 73 | 398 | e94 | 504 | 548 | 255 | 96 | 65 | 39 | 35 | 40 |
11 | 45 | 68 | 393 | 120 | 493 | 548 | 235 | 120 | 59 | 34 | 33 | 40 |
12 | 44 | 63 | 363 | 218 | 478 | 513 | 240 | 115 | 55 | 33 | 92 | 41 |
13 | 44 | 59 | 325 | 625 | 490 | 459 | 226 | 198 | 54 | 32 | 48 | 38 |
14 | 43 | 55 | 265 | 686 | 688 | 395 | 198 | 243 | 53 | 34 | 39 | 41 |
15 | 47 | 56 | 208 | 663 | 896 | 327 | 182 | 213 | 49 | 33 | 38 | 38 |
16 | 47 | 57 | 188 | 645 | 1040 | 269 | 167 | 170 | 48 | 32 | 37 | 45 |
17 | 48 | 55 | 161 | 583 | 1090 | 242 | 150 | 139 | 46 | 33 | 35 | 40 |
18 | 49 | 58 | 147 | 520 | 1030 | 239 | 139 | 121 | 44 | 33 | 86 | 40 |
19 | 48 | 88 | 114 | 463 | 1000 | 256 | 133 | 156 | 43 | 33 | 82 | 48 |
20 | 48 | 91 | e108 | 384 | 927 | 282 | 128 | 172 | 44 | 49 | 98 | 43 |
21 | 46 | 97 | e100 | 302 | 843 | 309 | 132 | 188 | 40 | 41 | 83 | 40 |
22 | 45 | 91 | 95 | 234 | 749 | 333 | 142 | 173 | 37 | 36 | 79 | 49 |
23 | 98 | 86 | 87 | 212 | 658 | 344 | 147 | 152 | 35 | 38 | 69 | 56 |
24 | 77 | 87 | 80 | 207 | 577 | 338 | 143 | 130 | 35 | 44 | 59 | 46 |
25 | 76 | 97 | 71 | 195 | 511 | 324 | 137 | 112 | 35 | 38 | 53 | 59 |
26 | 64 | 90 | 67 | 183 | 446 | 308 | 126 | 101 | 35 | 38 | 49 | 80 |
27 | 57 | 135 | 66 | 167 | 389 | 289 | 116 | 92 | 36 | 41 | 49 | 63 |
28 | 51 | 134 | 65 | 154 | 385 | 273 | 110 | 85 | 35 | 35 | 47 | 60 |
29 | 51 | 129 | 66 | 153 | --- | 257 | 103 | 82 | 35 | 34 | 55 | 61 |
30 | 58 | 130 | 67 | 147 | --- | 245 | 97 | 81 | 34 | 34 | 45 | 50 |
31 | 60 | --- | 81 | 141 | --- | 247 | --- | 79 | --- | 34 | 43 | --- |
TOTAL | 1592 | 2780 | 5358 | 8094 | 15355 | 10610 | 5808 | 3769 | 1572 | 1120 | 1557 | 1384 |
MEAN | 51.4 | 92.7 | 173 | 261 | 548 | 342 | 194 | 122 | 52.4 | 36.1 | 50.2 | 46.1 |
MAX | 98 | 143 | 398 | 686 | 1090 | 548 | 307 | 243 | 78 | 49 | 98 | 80 |
MIN | 41 | 55 | 65 | 83 | 128 | 239 | 97 | 76 | 34 | 31 | 32 | 38 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1977 - 2005, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 128 | 175 | 223 | 162 | 257 | 427 | 471 | 324 | 243 | 147 | 120 | 125 |
MAX | 1011 | 785 | 865 | 514 | 626 | 1510 | 1395 | 1136 | 1123 | 599 | 648 | 756 |
(WY) | 1987 | 1986 | 1983 | 1993 | 2001 | 1979 | 1993 | 2004 | 2000 | 1993 | 1978 | 1986 |
MIN | 16.6 | 16.5 | 12.7 | 10.6 | 11.9 | 59.8 | 79.9 | 31.3 | 23.1 | 23.9 | 15.0 | 18.3 |
(WY) | 1977 | 1977 | 1977 | 1977 | 1977 | 2003 | 1977 | 1977 | 1977 | 1977 | 1977 | 1977 |
SUMMARY STATISTICS | FOR 2004 CALENDAR YEAR | FOR 2005 WATER YEAR | WATER YEARS 1977 - 2005 | |||
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ANNUAL TOTAL | 115676 | 58999 | ||||
ANNUAL MEAN | 316 | 162 | 233 | |||
HIGHEST ANNUAL MEAN | 428 | 1993 | ||||
LOWEST ANNUAL MEAN | 26.8 | 1977 | ||||
HIGHEST DAILY MEAN | 3810 | May 25 | 1090 | Feb 17 | 3810 | May 25 2004 |
LOWEST DAILY MEAN | 40 | Sep 8,22 | 31 | Jul 2,3 | 7.5 | Feb 6 1977 |
ANNUAL SEVEN-DAY MINIMUM | 44 | Oct 1 | 33 | Jul 12 | 7.9 | Jan 31 1977 |
MAXIMUM PEAK FLOW | 1090 | Feb 16,17 | 3890 A | May 25 2004 | ||
MAXIMUM PEAK STAGE | 6.88 | Feb 17 | 11.95 B | Sep 27 1986 | ||
INSTANTANEOUS LOW FLOW | 23 | C | ||||
10 PERCENT EXCEEDS | 817 | 391 | 569 | |||
50 PERCENT EXCEEDS | 108 | 87 | 120 | |||
90 PERCENT EXCEEDS | 48 | 35 | 41 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |