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.-- Two 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 two sewage-treatment plants 13-16 mi upstream averaged about 15.0 ft3/s. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 19 | e54 | 36 | 92 | e45 | 48 | 72 | 492 | 140 | 23 | 68 | 28 |
2 | 18 | e26 | 32 | 82 | e260 | 45 | 63 | 163 | 101 | 30 | 46 | 25 |
3 | 14 | 24 | 32 | 99 | e300 | 74 | 55 | 78 | 81 | 107 | 47 | 23 |
4 | 15 | 22 | 34 | 2290 | e100 | 474 | 51 | 56 | 67 | 93 | 37 | 20 |
5 | 15 | 22 | 40 | 1690 | e74 | 614 | 52 | 53 | 60 | 314 | 40 | 20 |
6 | 14 | 51 | 40 | 223 | e64 | 189 | 46 | 48 | 57 | 601 | 31 | 21 |
7 | 14 | 46 | 34 | 139 | e54 | 99 | 43 | 43 | 54 | 88 | 29 | 19 |
8 | 14 | 25 | 33 | 108 | e48 | 83 | 41 | 38 | 49 | 47 | 25 | 18 |
9 | 20 | 21 | 32 | 92 | e75 | 76 | 37 | 35 | 48 | 36 | 23 | 16 |
10 | 49 | 20 | 40 | 77 | e190 | 65 | 34 | 31 | 50 | 30 | 22 | 15 |
11 | 20 | 17 | 41 | 75 | 265 | 62 | 42 | 34 | 48 | 27 | 20 | 14 |
12 | 17 | 18 | 31 | 77 | 223 | 54 | 36 | 56 | 53 | 25 | 18 | 14 |
13 | 16 | 16 | 29 | 73 | 108 | 50 | 34 | 72 | 59 | 24 | 19 | 15 |
14 | 49 | 16 | 31 | 68 | 102 | 57 | 32 | 886 | 40 | 23 | 19 | 15 |
15 | 36 | 29 | 33 | 62 | 110 | 51 | 29 | 269 | 37 | 21 | 18 | 17 |
16 | 20 | 32 | 34 | 57 | 71 | 52 | 27 | 97 | 143 | 21 | 17 | 17 |
17 | 64 | 24 | 32 | 674 | 61 | 55 | 27 | 69 | 434 | 46 | 16 | 16 |
18 | 37 | 3320 | 33 | 947 | 69 | 57 | 29 | 156 | 341 | 21 | 17 | 13 |
19 | 23 | 1700 | 32 | 182 | 87 | 49 | 23 | 268 | 345 | 19 | 16 | 14 |
20 | 20 | 202 | 28 | 112 | 120 | 48 | 23 | 160 | 66 | 18 | 61 | 13 |
21 | 18 | 112 | 27 | 91 | 90 | e43 | 23 | 84 | 47 | 18 | 31 | 12 |
22 | 17 | 77 | 28 | e76 | 69 | 38 | 25 | 60 | 42 | 18 | 21 | 12 |
23 | 16 | 121 | 636 | e66 | 66 | 39 | 55 | 87 | 36 | 171 | 21 | 12 |
24 | 16 | 263 | 159 | e62 | 63 | e40 | 60 | 256 | 31 | 36 | 25 | 12 |
25 | 14 | 84 | 83 | e58 | 57 | 41 | 92 | 578 | 29 | 125 | 59 | 12 |
26 | 14 | 59 | 61 | e55 | 51 | 62 | 44 | 2300 | 25 | 62 | 628 | 12 |
27 | 14 | 52 | 54 | e52 | 46 | 184 | 34 | 1960 | 24 | 29 | 68 | 12 |
28 | 15 | 46 | 60 | e50 | 48 | 107 | 30 | 2190 | 24 | 25 | 107 | 11 |
29 | 17 | 38 | 1150 | e48 | 49 | 257 | 29 | 402 | 22 | 23 | 192 | 11 |
30 | e20 | 38 | 240 | e47 | --- | 138 | 30 | 334 | 23 | 806 | 52 | 11 |
31 | e30 | --- | 134 | e46 | --- | 92 | --- | 503 | --- | 345 | 34 | --- |
TOTAL | 685 | 6575 | 3309 | 7870 | 2965 | 3343 | 1218 | 11858 | 2576 | 3272 | 1827 | 470 |
MEAN | 22.1 | 219 | 107 | 254 | 102 | 108 | 40.6 | 383 | 85.9 | 106 | 58.9 | 15.7 |
MAX | 64 | 3320 | 1150 | 2290 | 300 | 614 | 92 | 2300 | 434 | 806 | 628 | 28 |
MIN | 14 | 16 | 27 | 46 | 45 | 38 | 23 | 31 | 22 | 18 | 16 | 11 |
CFSM | 0.17 | 1.70 | 0.83 | 1.97 | 0.79 | 0.84 | 0.31 | 2.97 | 0.67 | 0.82 | 0.46 | 0.12 |
IN. | 0.20 | 1.90 | 0.95 | 2.27 | 0.86 | 0.96 | 0.35 | 3.42 | 0.74 | 0.94 | 0.53 | 0.14 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 42.7 | 110 | 126 | 109 | 155 | 188 | 182 | 161 | 110 | 78.4 | 42.0 | 57.0 |
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 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1970 - 2004 | |||
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ANNUAL TOTAL | 45686 | 45968 | ||||
ANNUAL MEAN | 125 | 126 | 113 | |||
HIGHEST ANNUAL MEAN | 198 | 1973 | ||||
LOWEST ANNUAL MEAN | 23.5 | 1976 | ||||
HIGHEST DAILY MEAN | 3760 | Jun 12 | 3320 | Nov 18 | 13300 | May 17 1995 |
LOWEST DAILY MEAN | 12 A | B | 11 | Sep 28, 29, 30 | 4.2 | Oct 17 1976 |
ANNUAL SEVEN-DAY MINIMUM | 12 | Aug 15 | 12 | Sep 24 | 4.8 | Oct 12 1976 |
MAXIMUM PEAK FLOW | 5200 | Nov 18 | 23400 | Apr 29 1996 | ||
MAXIMUM PEAK STAGE | 40.50 | Nov 18 | 44.4 C | Apr 29 1996 | ||
INSTANTANEOUS LOW FLOW | 9.3 | Sep 29 | ||||
ANNUAL RUNOFF (CFSM) | 0.970 | 0.974 | 0.876 | |||
ANNUAL RUNOFF (INCHES) | 13.17 | 13.26 | 11.91 | |||
10 PERCENT EXCEEDS | 180 | 228 | 189 | |||
50 PERCENT EXCEEDS | 38 | 46 | 28 | |||
90 PERCENT EXCEEDS | 15 | 16 | 9.4 |
A - May have been less during period of estimated discharges in January. |
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Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |