LOCATION.-- Lat 41°44'20", long 87°53'47" (NAD of 1927), in SE1/4NE1/4 sec.31, T.38 N., R.12 E., Cook County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on German Church Road, 1.1 mi northwest of Willow Springs, and at mile 2.2. |
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DRAINAGE AREA.-- 16.5 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: July 1951 to current year. |
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STAGE: Water years 1994 to current year. |
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SURFACE-WATER QUALITY |
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MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000. |
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BIOLOGICAL |
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BENTHIC MACROINVERTEBRATES: Water year 2000. |
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FISH: Water year 2001. |
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HABITAT: Water year 2000. |
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REVISED RECORDS.-- WDR IL-75-1: Drainage area. |
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GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 606.36 ft above NGVD of 1929. Prior to June 17, 1963, water-stage recorder at same site at datum 3.73 ft higher. June 17, 1963, to June 26, 1964, nonrecording gage at site 0.5 mi upstream at datum 4.82 ft higher. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,680 ft3/s, Sept. 14, 1961, gage height, 13.71 ft, present datum; minimum daily, 0.1 ft3/s, Dec. 9, 1957. |
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REMARKS FOR CURRENT YEAR.-- Records good except those greater than 100 ft3/s, which are fair. Effluent from sewage-treatment plant 2 mi. upstream averaged 16.8 ft3/s during the year. The maximum monthly average was 30.2 ft3/s in May, and the minimum was 13.3 ft3/s in January and February. |
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 | 16 | 14 | 13 | 12 | 15 | 12 | 18 | 240 | 29 | 13 | 51 | 58 |
2 | 22 | 14 | 13 | 12 | 14 | 12 | 17 | 96 | 23 | 13 | 35 | 28 |
3 | 16 | 13 | 13 | 13 | 17 | 12 | 16 | 54 | 33 | 13 | 45 | 18 |
4 | 57 | 13 | 15 | 12 | 17 | 13 | 152 | 55 | 22 | 12 | 45 | 15 |
5 | 28 | 15 | 13 | 12 | 14 | 13 | 99 | 194 | 19 | 48 | 24 | 14 |
6 | 18 | 14 | 13 | 13 | 14 | 13 | 46 | 67 | 19 | 67 | 39 | 12 |
7 | 17 | 15 | 13 | 13 | 13 | 14 | 43 | 45 | 17 | 43 | 34 | 12 |
8 | 15 | 14 | 13 | 13 | 12 | 15 | 35 | 35 | 29 | 43 | 21 | 12 |
9 | 15 | 14 | 14 | 13 | 12 | 16 | 31 | 283 | 25 | 35 | 17 | 12 |
10 | 15 | 15 | 13 | 13 | 12 | 15 | 29 | 116 | 20 | 31 | 15 | 12 |
11 | 14 | 14 | 13 | 12 | 13 | 15 | 25 | 215 | 18 | 20 | 18 | 11 |
12 | 14 | 14 | 14 | 12 | 12 | 36 | 23 | 72 | 17 | 16 | 16 | 13 |
13 | 14 | 14 | 14 | 13 | 12 | 39 | 21 | 43 | 17 | 14 | 14 | 12 |
14 | 14 | 15 | 13 | 13 | 12 | 26 | 21 | 45 | 15 | 15 | 14 | 29 |
15 | 15 | 20 | 13 | 13 | 12 | 23 | 20 | 34 | 14 | 119 | 14 | 16 |
16 | 13 | 15 | 13 | 13 | 12 | 22 | 20 | 29 | 15 | 33 | 13 | 13 |
17 | 15 | 14 | 14 | 13 | 14 | 22 | 19 | 24 | 14 | 50 | 14 | 13 |
18 | 15 | 14 | 107 | 13 | 12 | 20 | 19 | 21 | 21 | 83 | 13 | 11 |
19 | 14 | 17 | 81 | 13 | 13 | 21 | 18 | 21 | 20 | 30 | 12 | 12 |
20 | 13 | 13 | 32 | 13 | 13 | 30 | 20 | 56 | 15 | 26 | 12 | 11 |
21 | 14 | 18 | 22 | 9.8 | 14 | 24 | 18 | 24 | 14 | 177 | 13 | 11 |
22 | 13 | 17 | 18 | 13 | 13 | 20 | 17 | 20 | 14 | 47 | 13 | 21 |
23 | 13 | 13 | 17 | 12 | 12 | 18 | 17 | 18 | 14 | 28 | 12 | 14 |
24 | 14 | 13 | 15 | 12 | 12 | 18 | 17 | 17 | 13 | 21 | 11 | 13 |
25 | 18 | 13 | 14 | 12 | 12 | 20 | 18 | 16 | 12 | 18 | 12 | 12 |
26 | 15 | 13 | 14 | 12 | 12 | 18 | 16 | 16 | 13 | 16 | 13 | 33 |
27 | 14 | 13 | 14 | 12 | 12 | 18 | 16 | 17 | 13 | 15 | 12 | 24 |
28 | 15 | 13 | 13 | 12 | 13 | 35 | 17 | 35 | 13 | 18 | 11 | 15 |
29 | 13 | 13 | 12 | 12 | --- | 28 | 17 | 26 | 14 | 16 | 21 | 15 |
30 | 14 | 14 | 15 | 13 | --- | 21 | 59 | 49 | 12 | 14 | 14 | 13 |
31 | 14 | --- | 14 | 13 | --- | 20 | --- | 73 | --- | 14 | 15 | --- |
TOTAL | 517 | 431 | 615 | 386.8 | 365 | 629 | 904 | 2056 | 534 | 1108 | 613 | 505 |
MEAN | 16.7 | 14.4 | 19.8 | 12.5 | 13.0 | 20.3 | 30.1 | 66.3 | 17.8 | 35.7 | 19.8 | 16.8 |
MAX | 57 | 20 | 107 | 13 | 17 | 39 | 152 | 283 | 33 | 177 | 51 | 58 |
MIN | 13 | 13 | 12 | 9.8 | 12 | 12 | 16 | 16 | 12 | 12 | 11 | 11 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 16.0 | 19.2 | 19.2 | 18.3 | 22.4 | 31.7 | 35.7 | 27.7 | 21.4 | 18.3 | 17.7 | 17.2 |
MAX | 100 | 69.6 | 86.6 | 59.8 | 98.8 | 110 | 95.0 | 90.9 | 68.1 | 67.7 | 66.8 | 106 |
(WY) | 1955 | 1991 | 1983 | 1993 | 1997 | 1979 | 1983 | 1996 | 1993 | 1996 | 1987 | 1961 |
MIN | 2.30 | 2.37 | 2.83 | 2.44 | 4.05 | 5.88 | 7.00 | 4.94 | 5.64 | 4.94 | 4.65 | 3.01 |
(WY) | 1954 | 1954 | 1959 | 1956 | 1963 | 1957 | 1971 | 1958 | 1956 | 1952 | 1953 | 1954 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1951 - 2003 | |||
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ANNUAL TOTAL | 10266 | 8663.8 | ||||
ANNUAL MEAN | 28.1 | 23.7 | 22.0 | |||
HIGHEST ANNUAL MEAN | 39.6 | 1983 | ||||
LOWEST ANNUAL MEAN | 7.79 | 1953 | ||||
HIGHEST DAILY MEAN | 397 | May 12 | 283 | May 9 | 1040 | Jul 18 1996 |
LOWEST DAILY MEAN | 12 | Dec 29 | 9.8 | Jan 21 | 0.10 | Dec 9 1957 |
ANNUAL SEVEN-DAY MINIMUM | 13 | Nov 23 | 12 | Jan 21 | 1.0 | Feb 3 1959 |
MAXIMUM PEAK FLOW | 600 | May 9 | 2680 | Sep 14 1961 | ||
MAXIMUM PEAK STAGE | 7.16 | May 9 | 13.71 A | Sep 14 1961 | ||
INSTANTANEOUS LOW FLOW | 2.4 | Jan 21 | ||||
10 PERCENT EXCEEDS | 49 | 43 | 41 | |||
50 PERCENT EXCEEDS | 17 | 15 | 14 | |||
90 PERCENT EXCEEDS | 14 | 12 | 4.5 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |