LOCATION.-- Lat 38°19'26", long 89°58'14" (NAD of 1983), 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 to current year. 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 crest-stage gage. Datum of gage is 375.00 ft above NGVD of 1929 (374.50 ft NAVD 1988). 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 fair except those for estimated daily discharges, which are poor. Effluent from three sewage-treatment plants 13-16 mi upstream averaged about 14.2 ft3/s. |
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 | 11 | 263 | 650 | 44 | 87 | 70 | 59 | 65 | e18 | 12 | 12 | 12 |
2 | 11 | 391 | 186 | 54 | 85 | 63 | 57 | 54 | e17 | 11 | 12 | 11 |
3 | 12 | 114 | 136 | 892 | 106 | 61 | 54 | 49 | e18 | 10 | 11 | 10 |
4 | 12 | 284 | 114 | 633 | 105 | 61 | 56 | 48 | e16 | 270 | 11 | 10 |
5 | 11 | 95 | 100 | e4020 | 89 | 59 | 54 | 43 | e16 | 230 | 11 | 10 |
6 | 11 | 64 | 269 | e2170 | 84 | 55 | 52 | 40 | e18 | 34 | 12 | 11 |
7 | 11 | 54 | 1940 | e417 | 195 | 61 | 52 | 37 | 32 | 22 | 12 | 11 |
8 | 12 | 47 | 470 | 324 | 377 | 60 | 49 | 36 | e17 | 19 | 11 | 11 |
9 | 17 | 42 | 159 | 287 | 261 | 52 | 45 | 45 | e18 | 14 | 10 | 12 |
10 | 13 | 40 | 126 | 262 | 151 | 51 | 45 | 40 | 20 | 14 | 10 | 11 |
11 | 11 | 1640 | 109 | 222 | 107 | 52 | 44 | 35 | e17 | 37 | 10 | 10 |
12 | 15 | 718 | 88 | 223 | 99 | 49 | 240 | 32 | e16 | 435 | 10 | 11 |
13 | 53 | 136 | 73 | 3250 | 1120 | 46 | 619 | 31 | e30 | 99 | 12 | 10 |
14 | 18 | 92 | 58 | 1320 | 665 | 44 | 96 | 36 | 185 | 149 | 118 | 63 |
15 | 51 | 76 | 54 | 255 | 198 | 43 | 68 | 38 | 30 | 63 | 51 | 304 |
16 | 26 | 68 | 56 | 183 | 145 | 43 | 56 | 30 | 21 | 123 | 30 | 727 |
17 | 16 | 62 | 55 | 150 | 120 | 45 | 50 | 28 | e18 | 51 | 24 | 58 |
18 | 200 | 62 | 52 | 133 | 98 | 45 | 46 | 25 | e16 | 33 | 20 | 34 |
19 | 154 | 169 | 49 | 132 | 93 | 42 | 43 | 24 | e15 | 37 | 22 | 24 |
20 | 34 | 98 | 42 | 133 | 106 | 41 | 41 | 154 | e14 | 27 | 17 | 1160 |
21 | 25 | 71 | 43 | 135 | 94 | 40 | 53 | 38 | 14 | 22 | 12 | 121 |
22 | 24 | 68 | 39 | 115 | 83 | 388 | 619 | 30 | 13 | 19 | 12 | 46 |
23 | 121 | 70 | 37 | 95 | 77 | 526 | 137 | 29 | 13 | 16 | 11 | 31 |
24 | 65 | 1120 | e34 | 95 | 78 | 169 | 84 | 25 | 13 | 15 | 11 | 27 |
25 | 31 | 1130 | e32 | 95 | 76 | 228 | 65 | 22 | 13 | 14 | 13 | 413 |
26 | 125 | 176 | e31 | 105 | 78 | 136 | 120 | 23 | 13 | 14 | 142 | 409 |
27 | 223 | 152 | 30 | e93 | 75 | 156 | 80 | 21 | 12 | 21 | 112 | 74 |
28 | 53 | 156 | 31 | e72 | 75 | 122 | 69 | 21 | 11 | 18 | 26 | 260 |
29 | 35 | 189 | 35 | 86 | --- | 86 | 94 | 20 | 13 | 15 | 18 | 1110 |
30 | 39 | 767 | 37 | 115 | --- | 76 | 105 | 19 | 13 | 13 | 14 | 114 |
31 | 38 | --- | 44 | 99 | --- | 68 | --- | 19 | --- | 12 | 12 | --- |
TOTAL | 1478 | 8414 | 5179 | 16209 | 4927 | 3038 | 3252 | 1157 | 680 | 1869 | 809 | 5115 |
MEAN | 47.7 | 280 | 167 | 523 | 176 | 98.0 | 108 | 37.3 | 22.7 | 60.3 | 26.1 | 170 |
MAX | 223 | 1640 | 1940 | 4020 | 1120 | 526 | 619 | 154 | 185 | 435 | 142 | 1160 |
MIN | 11 | 40 | 30 | 44 | 75 | 40 | 41 | 19 | 11 | 10 | 10 | 10 |
CFSM | 0.37 | 2.17 | 1.30 | 4.05 | 1.36 | 0.76 | 0.84 | 0.29 | 0.18 | 0.47 | 0.20 | 1.32 |
IN. | 0.43 | 2.43 | 1.49 | 4.67 | 1.42 | 0.88 | 0.94 | 0.33 | 0.20 | 0.54 | 0.23 | 1.48 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 2005, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 42.9 | 115 | 127 | 120 | 156 | 186 | 180 | 158 | 108 | 77.9 | 41.5 | 60.2 |
MAX | 270 | 516 | 590 | 523 | 505 | 611 | 751 | 1306 | 513 | 322 | 271 | 471 |
(WY) | 1987 | 1986 | 1983 | 2005 | 1982 | 1984 | 1994 | 1995 | 2003 | 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 2004 CALENDAR YEAR | FOR 2005 WATER YEAR | WATER YEARS 1970 - 2005 | |||
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ANNUAL TOTAL | 50470 | 52127 | ||||
ANNUAL MEAN | 138 | 143 | 114 | |||
HIGHEST ANNUAL MEAN | 198 | 1973 | ||||
LOWEST ANNUAL MEAN | 23.5 | 1976 | ||||
HIGHEST DAILY MEAN | 2300 | May 26 | 4020 A | Jan 5 | 13300 | May 17 1995 |
LOWEST DAILY MEAN | 11 | Several days | 10 | Several days | 4.2 | Oct 17 1976 |
ANNUAL SEVEN-DAY MINIMUM | 11 | Sep 26 | 11 | Sep 2 | 4.8 | Oct 12 1976 |
MAXIMUM PEAK FLOW | 6580 | Jan 5 | 23400 | Apr 29 1996 | ||
MAXIMUM PEAK STAGE | 41.09 | Jan 5 | 44.4 B | Apr 29 1996 | ||
INSTANTANEOUS LOW FLOW | 8.0 C | |||||
ANNUAL RUNOFF (CFSM) | 1.07 | 1.11 | 0.883 | |||
ANNUAL RUNOFF (INCHES) | 14.55 | 15.03 | 11.99 | |||
10 PERCENT EXCEEDS | 268 | 262 | 191 | |||
50 PERCENT EXCEEDS | 52 | 51 | 29 | |||
90 PERCENT EXCEEDS | 17 | 12 | 9.4 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |