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 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. 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 11.0 ft3/s. |
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 | 9.8 | 37 | 13 | e120 | e21 | e80 | 52 | 53 | 38 | 86 | 16 | 392 |
2 | 9.8 | 28 | 14 | e450 | e23 | 142 | 46 | 47 | 36 | 73 | 16 | 382 |
3 | 10 | 29 | 14 | 61 | e26 | 78 | 43 | 40 | 69 | 64 | 25 | 154 |
4 | 11 | 36 | 14 | 51 | 29 | 65 | 55 | 506 | 47 | 55 | 69 | 43 |
5 | 16 | 80 | 15 | 50 | 22 | 69 | 144 | 1520 | 39 | 50 | 34 | 30 |
6 | 12 | 80 | 14 | 54 | 21 | 53 | 61 | 301 | 39 | 44 | 22 | 25 |
7 | 11 | 34 | e13 | 44 | 20 | 45 | 86 | 900 | 55 | 39 | 18 | 22 |
8 | 10 | 27 | e13 | 38 | 21 | 43 | 57 | 574 | 39 | 35 | 16 | 20 |
9 | 10 | 25 | e13 | 35 | 19 | 40 | 47 | 333 | 32 | 32 | 15 | 19 |
10 | 9.6 | 60 | e13 | 31 | e18 | 35 | 44 | 146 | 419 | 71 | 15 | 18 |
11 | 9.6 | 34 | 16 | 27 | e17 | 34 | 42 | 261 | 3200 | 45 | 14 | 18 |
12 | 9.1 | 23 | 14 | 27 | e17 | 288 | 41 | 99 | 3760 | 35 | 14 | 17 |
13 | 9.2 | 20 | 15 | e25 | e17 | 286 | 39 | 73 | 1430 | 31 | 13 | 18 |
14 | 9.2 | 20 | 18 | e23 | e45 | 136 | 37 | 66 | 451 | 31 | 13 | 19 |
15 | 9.4 | 25 | 19 | e21 | 107 | 89 | 33 | 71 | 161 | 29 | 14 | 19 |
16 | 9.4 | 29 | 17 | e20 | 88 | 71 | 34 | 61 | 113 | 25 | 13 | 17 |
17 | 9.5 | 23 | 16 | e19 | 56 | 62 | 76 | 55 | 83 | 24 | 12 | 16 |
18 | 11 | 21 | 33 | e18 | 50 | 58 | 45 | 53 | 71 | 408 | 12 | 16 |
19 | 81 | 19 | 115 | e17 | 334 | 476 | 39 | 49 | 67 | 149 | 12 | 14 |
20 | 32 | 19 | 64 | e16 | 424 | 308 | 38 | 58 | 65 | 50 | 12 | 12 |
21 | 17 | 18 | 37 | e15 | 249 | 178 | 37 | 49 | 55 | 36 | 12 | 12 |
22 | 14 | 17 | 24 | e14 | 355 | 102 | 33 | 37 | 51 | 29 | 14 | 14 |
23 | 11 | 17 | 24 | e13 | 152 | 77 | 30 | 33 | 47 | 25 | 14 | 13 |
24 | 11 | 17 | e24 | e12 | 102 | 77 | 123 | 32 | 43 | 23 | 14 | 12 |
25 | 658 | 17 | 24 | e12 | 74 | 80 | 184 | 627 | 39 | 21 | 14 | 12 |
26 | 151 | 14 | e20 | e12 | 60 | 91 | 146 | 137 | 3670 | 20 | 15 | 19 |
27 | 33 | 14 | e19 | e13 | e54 | 67 | 61 | 73 | 887 | 19 | 17 | 178 |
28 | 23 | 15 | e18 | e14 | e56 | 77 | 203 | 56 | 176 | 18 | 18 | 40 |
29 | 1270 | 14 | e24 | e15 | --- | 116 | 151 | 46 | 120 | 19 | 84 | 22 |
30 | 257 | 13 | e45 | e16 | --- | 69 | 70 | 42 | 98 | 18 | 41 | 17 |
31 | 58 | --- | e700 | e18 | --- | 58 | --- | 46 | --- | 17 | 99 | --- |
TOTAL | 2801.6 | 825 | 1422 | 1301 | 2477 | 3450 | 2097 | 6444 | 15400 | 1621 | 717 | 1610 |
MEAN | 90.4 | 27.5 | 45.9 | 42.0 | 88.5 | 111 | 69.9 | 208 | 513 | 52.3 | 23.1 | 53.7 |
MAX | 1270 | 80 | 700 | 450 | 424 | 476 | 203 | 1520 | 3760 | 408 | 99 | 392 |
MIN | 9.1 | 13 | 13 | 12 | 17 | 34 | 30 | 32 | 32 | 17 | 12 | 12 |
CFSM | 0.70 | 0.21 | 0.36 | 0.33 | 0.69 | 0.86 | 0.54 | 1.61 | 3.98 | 0.41 | 0.18 | 0.42 |
IN. | 0.81 | 0.24 | 0.41 | 0.38 | 0.71 | 0.99 | 0.60 | 1.86 | 4.44 | 0.47 | 0.21 | 0.46 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 43.3 | 107 | 126 | 105 | 157 | 190 | 186 | 155 | 111 | 77.6 | 41.5 | 58.3 |
MAX | 270 | 516 | 590 | 338 | 505 | 611 | 751 | 1306 | 513 | 322 | 271 | 471 |
(WY) | 1987 | 1986 | 1983 | 1974 | 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 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1970 - 2003 | |||
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ANNUAL TOTAL | 43422.6 | 40165.6 | ||||
ANNUAL MEAN | 119 | 110 | 113 | |||
HIGHEST ANNUAL MEAN | 198 | 1973 | ||||
LOWEST ANNUAL MEAN | 23.5 | 1976 | ||||
HIGHEST DAILY MEAN | 2770 | Jun 12 | 3760 | Jun 12 | 13300 | May 17 1995 |
LOWEST DAILY MEAN | 9.1 | Oct 12 | 9.1 | Oct 12 | 4.2 | Oct 17 1976 |
ANNUAL SEVEN-DAY MINIMUM | 9.3 | Oct 11 | 9.3 | Oct 11 | 4.8 | Oct 12 1976 |
MAXIMUM PEAK FLOW | 6420 | Jun 26 | 23400 | Apr 29 1996 | ||
MAXIMUM PEAK STAGE | 41.04 | Jun 26 | 44.4 A | Apr 29 1996 | ||
INSTANTANEOUS LOW FLOW | 6.7 | Oct 13 | ||||
ANNUAL RUNOFF (CFSM) | 0.92 | 0.85 | 0.87 | |||
ANNUAL RUNOFF (INCHES) | 12.52 | 11.58 | 11.87 | |||
10 PERCENT EXCEEDS | 203 | 167 | 187 | |||
50 PERCENT EXCEEDS | 33 | 34 | 28 | |||
90 PERCENT EXCEEDS | 11 | 13 | 9.3 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |