LOCATION.-- Lat 38°19'26", long 89°58'15" (NAD of 1927), in SW1/4SE1/4 sec.27 projected, T.2 S., R.8 W., St. Clair County, Hydrologic Unit 07140204, on left bank at downstream side of bridge on State Highway 156, 2 mi northeast of Hecker, 5 mi west of New Athens, and at mile 17.3. |
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DRAINAGE AREA.-- 129 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1969 to current year. |
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STAGE: Water years 1995-2002. October 1980 to September 1994 (8 a.m. gage heights). |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1978-91. |
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REVISED RECORDS.-- WDR IL-75-1: Drainage area. |
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GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, phone telemeter, and crest-stage gage. Datum of gage is 375.00 ft above NGVD of 1929. June 28, 1976, to Nov. 9, 1978, nonrecording gage at same site and datum. |
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REMARKS.-- Three sewage-treatment plants 13-16 mi upstream. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 23,400 ft3/s, April 29, 1996, gage height, 44.4 ft, from floodmark; minimum daily discharge, 4.2 ft3/s, Oct. 17, 1976. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from three sewage-treatment plants 13-16 mi upstream averaged about 11.3 ft3/s. |
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 | 9.5 | 16 | 148 | e29 | 1120 | 51 | 91 | 89 | 51 | 25 | 15 | 11 |
2 | 7.0 | 24 | 70 | e27 | 176 | 93 | 80 | 78 | 49 | 23 | 13 | 10 |
3 | 6.9 | 24 | 52 | e26 | 122 | 137 | 81 | 62 | 46 | 22 | 13 | 11 |
4 | 6.7 | 19 | 42 | e25 | 88 | 71 | 71 | 56 | 43 | 22 | 13 | 11 |
5 | 21 | 17 | 37 | e25 | 68 | 61 | 61 | 56 | 42 | 22 | 14 | 11 |
6 | 31 | 16 | 38 | e26 | 67 | 74 | 58 | 275 | 43 | 21 | 195 | 10 |
7 | 16 | 16 | 37 | e27 | 70 | 59 | 58 | 1120 | 40 | 21 | 50 | 11 |
8 | 13 | 17 | 32 | e28 | 58 | 54 | 314 | 2100 | 38 | 20 | 23 | 12 |
9 | 11 | 17 | 30 | e30 | 52 | 1820 | 283 | 2310 | 38 | 19 | 16 | 12 |
10 | 14 | 17 | 28 | e31 | 49 | 490 | 121 | 533 | 84 | 18 | 14 | 11 |
11 | 20 | 15 | 26 | 33 | 46 | 151 | 86 | 171 | 602 | 18 | 15 | 10 |
12 | 125 | 15 | 89 | 32 | 45 | 130 | 77 | 215 | 2770 | 18 | 17 | 10 |
13 | 126 | 15 | 361 | 32 | 42 | 108 | 109 | 2290 | 379 | 18 | 16 | 10 |
14 | 164 | 12 | 717 | 32 | 40 | 88 | 92 | 491 | 121 | 17 | 15 | 11 |
15 | 34 | 11 | 171 | 29 | 39 | 459 | 76 | 175 | 81 | 17 | 13 | 15 |
16 | 137 | 14 | 1440 | 28 | 37 | 785 | 59 | 147 | 66 | 16 | 13 | 14 |
17 | 42 | 15 | 3290 | 28 | 36 | 184 | 54 | 548 | 56 | 17 | 12 | 70 |
18 | 26 | 16 | 698 | 25 | 35 | 136 | 60 | 629 | 50 | 113 | 15 | 184 |
19 | 21 | 16 | 169 | 28 | 126 | 406 | 50 | 176 | 46 | 129 | 22 | 140 |
20 | 17 | 16 | 110 | 32 | 229 | 385 | 107 | 131 | 42 | 24 | 41 | 216 |
21 | 18 | 14 | 83 | 30 | 86 | 152 | 214 | 110 | 40 | 20 | 24 | 72 |
22 | 16 | 13 | 74 | 30 | 59 | 102 | 186 | 88 | 37 | 18 | 14 | 24 |
23 | 17 | 13 | 76 | 33 | 51 | 91 | 78 | 79 | 35 | 49 | 13 | 18 |
24 | 88 | 91 | 58 | 86 | 48 | 81 | 65 | 83 | 33 | 23 | 14 | 15 |
25 | 127 | 59 | 48 | 48 | 46 | 1470 | 150 | 73 | 38 | 18 | 12 | 12 |
26 | 36 | 27 | 45 | 38 | 54 | 583 | 72 | 63 | 42 | 15 | 12 | 11 |
27 | 25 | 22 | e38 | 35 | 52 | 252 | 284 | 59 | 32 | 15 | 13 | 11 |
28 | 22 | 27 | e35 | 34 | 49 | 153 | 678 | 67 | 34 | 15 | 11 | 10 |
29 | 20 | 149 | e33 | 33 | --- | 255 | 149 | 160 | 28 | 15 | 12 | 11 |
30 | 19 | 1350 | e31 | 93 | --- | 183 | 106 | 72 | 26 | 15 | 12 | 10 |
31 | 18 | --- | e30 | 1110 | --- | 119 | --- | 57 | --- | 13 | 11 | --- |
TOTAL | 1254.1 | 2093 | 8136 | 2143 | 2990 | 9183 | 3970 | 12563 | 5032 | 816 | 693 | 984 |
MEAN | 40.45 | 69.77 | 262.5 | 69.13 | 106.8 | 296.2 | 132.3 | 405.3 | 167.7 | 26.32 | 22.35 | 32.80 |
MAX | 164 | 1350 | 3290 | 1110 | 1120 | 1820 | 678 | 2310 | 2770 | 129 | 195 | 216 |
MIN | 6.7 | 11 | 26 | 25 | 35 | 51 | 50 | 56 | 26 | 13 | 11 | 10 |
CFSM | 0.31 | 0.54 | 2.03 | 0.54 | 0.83 | 2.30 | 1.03 | 3.14 | 1.30 | 0.20 | 0.17 | 0.25 |
IN. | 0.36 | 0.60 | 2.35 | 0.62 | 0.86 | 2.65 | 1.14 | 3.62 | 1.45 | 0.24 | 0.20 | 0.28 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 41.90 | 109.0 | 128.6 | 106.5 | 158.8 | 192.9 | 189.2 | 153.3 | 98.48 | 78.32 | 42.04 | 58.40 |
MAX | 270 | 516 | 590 | 338 | 505 | 611 | 751 | 1306 | 430 | 322 | 271 | 471 |
(WY) | 1987 | 1986 | 1983 | 1974 | 1982 | 1984 | 1994 | 1995 | 2000 | 1981 | 1998 | 1993 |
MIN | 6.51 | 7.53 | 9.66 | 7.19 | 19.1 | 19.4 | 20.2 | 18.4 | 14.9 | 11.6 | 7.64 | 6.66 |
(WY) | 1972 | 1972 | 1977 | 1977 | 1978 | 1981 | 1981 | 1988 | 1972 | 1970 | 1971 | 1976 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1970 - 2002 | |||
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ANNUAL TOTAL | 33422.1 | 49857.1 | ||||
ANNUAL MEAN | 91.57 | 136.6 | 112.8 | |||
HIGHEST ANNUAL MEAN | 198 | 1973 | ||||
LOWEST ANNUAL MEAN | 23.5 | 1976 | ||||
HIGHEST DAILY MEAN | 3290 | Dec 17 | 3290 | Dec 17 | 13300 | May 17 1995 |
LOWEST DAILY MEAN | 6.7 | Oct 4 | 6.7 | Oct 4 | 4.2 | Oct 17 1976 |
ANNUAL SEVEN-DAY MINIMUM | 8.4 | Sep 28 | 11 | Aug 31 | 4.8 | Oct 12 1976 |
MAXIMUM PEAK FLOW | 4090 | Dec 17 | 23400 | Apr 29 1996 | ||
MAXIMUM PEAK STAGE | 39.86 | Dec 17 | 44.4 A | Apr 29 1996 | ||
INSTANTANEOUS LOW FLOW | 6.0 | Oct 4 | ||||
ANNUAL RUNOFF (CFSM) | 0.71 | 1.06 | 0.87 | |||
ANNUAL RUNOFF (INCHES) | 9.64 | 14.38 | 11.88 | |||
10 PERCENT EXCEEDS | 146 | 215 | 189 | |||
50 PERCENT EXCEEDS | 32 | 38 | 28 | |||
90 PERCENT EXCEEDS | 13 | 13 | 9.2 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |