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 1994-2002. |
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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. Effluent from sewage-treatment plant 2 mi. upstream averaged 20.0 ft3/s during the year. The maximum monthly average was 27.3 ft3/s in April, and the minimum was 15.0 ft3/s in January and 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 | 18 | 22 | 27 | 15 | 28 | 20 | 27 | 28 | 18 | 16 | 16 | 14 |
2 | 17 | 22 | 21 | 15 | 22 | 26 | 60 | 41 | 17 | 16 | 16 | 24 |
3 | 16 | 20 | 19 | 15 | 20 | 29 | 38 | 28 | 19 | 16 | 14 | 19 |
4 | 34 | 19 | 18 | 15 | 19 | 25 | 31 | 26 | 90 | 16 | 19 | 16 |
5 | 133 | 19 | 18 | 15 | 16 | 23 | 28 | 24 | 53 | 16 | 51 | 15 |
6 | 39 | 19 | 17 | 15 | 18 | 34 | 26 | 33 | 34 | 15 | 20 | 16 |
7 | 26 | 18 | 16 | 15 | 18 | 56 | 42 | 26 | 23 | 15 | 17 | 15 |
8 | 24 | 19 | 15 | 14 | 21 | 155 | 138 | 30 | 18 | 15 | 16 | 14 |
9 | 21 | 18 | 15 | 14 | 34 | 163 | 189 | 49 | 16 | 95 | 15 | 15 |
10 | 20 | 17 | 15 | 14 | 63 | 84 | 78 | 27 | 36 | 27 | 14 | 15 |
11 | 20 | 17 | 15 | 14 | 41 | 54 | 49 | 184 | 51 | 21 | 14 | 15 |
12 | 63 | 17 | 15 | 14 | 31 | 42 | 40 | 397 | 29 | 18 | 15 | 15 |
13 | 316 | 17 | 27 | 14 | 27 | 35 | 34 | 135 | 26 | 17 | 32 | 15 |
14 | 325 | 21 | 22 | 15 | 24 | 28 | 30 | 72 | 66 | 16 | 25 | 14 |
15 | 113 | 17 | 19 | 14 | 24 | 30 | 29 | 47 | 43 | 17 | 18 | 14 |
16 | 72 | 16 | 18 | 15 | 22 | 27 | 24 | 85 | 26 | 17 | 17 | 13 |
17 | 40 | 16 | 28 | 15 | 20 | 25 | 38 | 70 | 23 | 15 | 16 | 14 |
18 | 34 | 15 | 23 | 15 | 20 | 24 | 28 | 44 | 22 | 16 | 14 | 25 |
19 | 29 | 18 | 23 | 14 | 39 | 23 | 27 | 38 | 20 | 16 | 18 | 22 |
20 | 25 | 17 | 21 | 14 | 90 | 24 | 98 | 34 | 17 | 15 | 16 | 26 |
21 | 24 | 16 | 19 | 15 | 61 | 22 | 64 | 25 | 17 | 16 | 15 | 18 |
22 | 23 | 15 | 20 | 15 | 38 | 21 | 46 | 25 | 17 | 15 | 256 | 20 |
23 | 102 | 15 | 24 | 17 | 30 | 20 | 36 | 24 | 17 | 15 | 178 | 17 |
24 | 79 | 19 | 19 | 17 | 27 | 19 | 50 | 27 | 18 | 14 | 79 | 16 |
25 | 78 | 31 | 17 | 16 | 25 | 22 | 45 | 31 | 18 | 14 | 34 | 15 |
26 | 42 | 22 | 17 | 15 | 22 | 22 | 30 | 23 | 19 | 16 | 25 | 14 |
27 | 32 | 22 | 17 | 15 | 23 | 22 | 63 | 21 | 18 | 21 | 21 | 14 |
28 | 28 | 19 | 17 | 16 | 21 | 18 | 83 | 21 | 17 | 16 | 18 | 14 |
29 | 28 | 24 | 16 | 16 | --- | 44 | 45 | 21 | 16 | 18 | 18 | 16 |
30 | 22 | 47 | 15 | 17 | --- | 33 | 34 | 20 | 16 | 17 | 15 | 15 |
31 | 23 | --- | 16 | 22 | --- | 26 | --- | 20 | --- | 16 | 15 | --- |
TOTAL | 1866 | 594 | 589 | 472 | 844 | 1196 | 1550 | 1676 | 820 | 593 | 1057 | 495 |
MEAN | 60.19 | 19.80 | 19.00 | 15.23 | 30.14 | 38.58 | 51.67 | 54.06 | 27.33 | 19.13 | 34.10 | 16.50 |
MAX | 325 | 47 | 28 | 22 | 90 | 163 | 189 | 397 | 90 | 95 | 256 | 26 |
MIN | 16 | 15 | 15 | 14 | 16 | 18 | 24 | 20 | 16 | 14 | 14 | 13 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 15.95 | 19.29 | 19.15 | 18.46 | 22.55 | 31.91 | 35.77 | 26.99 | 21.52 | 17.97 | 17.66 | 17.16 |
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 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1951 - 2002 | |||
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ANNUAL TOTAL | 12355 | 11752 | ||||
ANNUAL MEAN | 33.85 | 32.20 | 22.02 | |||
HIGHEST ANNUAL MEAN | 39.6 | 1983 | ||||
LOWEST ANNUAL MEAN | 7.79 | 1953 | ||||
HIGHEST DAILY MEAN | 374 | Feb 9 | 397 | May 12 | 1040 | Jul 18 1996 |
LOWEST DAILY MEAN | 13 | Jul 14 | 13 | Sep 16 | 0.10 | Dec 9 1957 |
ANNUAL SEVEN-DAY MINIMUM | 14 | Jul 8 | 14 | Jan 7 | 1.0 | Feb 3 1959 |
MAXIMUM PEAK FLOW | 962 | Oct 13 | 2680 | Sep 14 1961 | ||
MAXIMUM PEAK STAGE | 8.30 | Oct 13 | 13.71 A | Sep 14 1961 | ||
INSTANTANEOUS LOW FLOW | 5.2 | Feb 5 | ||||
10 PERCENT EXCEEDS | 62 | 55 | 41 | |||
50 PERCENT EXCEEDS | 22 | 20 | 13 | |||
90 PERCENT EXCEEDS | 16 | 15 | 4.4 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |