LOCATION.-- Lat 40°42'26", long 90°16'48" (NAD of 1927), in SW1/4NE1/4 sec.4, T.8 N., R.2 E., Fulton County, Hydrologic Unit 07130005, on left bank at downstream side of bridge on State Highway 116, 0.2 mi downstream from a railroad bridge, 0.5 mi west of London Mills, 0.5 mi upstream from Cedar Creek, 4.0 mi downstream from Littlers Creek, and at mile 69.2. |
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DRAINAGE AREA.-- 1,072 mi2. Area at site used prior to April 26, 1984, 1,062 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1942 to current year. |
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STAGE: Water years 1994-2002. |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1978-91. |
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MISCELLANEOUS: Water years 1998 and 2002. |
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REVISED RECORDS.-- WSP 1175: 1947. WDR IL-84-2: 1948(M), 1950(M), 1951, 1954(M), 1955, 1958, 1960, 1962, 1964, 1965, 1970, and drainage area. |
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GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, and crest-stage gage. Datum of gage is 508.97 ft above NGVD of 1929. Prior to July 13, 1945, nonrecording gage at same site and datum. July 14, 1945, to Apr. 26, 1984, at site 0.9 mi upstream at same datum. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 41,000 ft3/s, June 23, 1974, gage height, 28.03 ft, from graph based on gage readings; minimum, 2.6 ft3/s, Sept. 16, 1988. |
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EXTREMES OUTSIDE PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Flood of Aug. 26, 1924, reached a stage of 27.08 ft, from information by local residents. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for Mar. 14 to Sep. 10, and those for estimated daily discharges, which are poor. |
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 | 100 | 195 | 212 | e150 | 341 | 607 | 523 | 1710 | 1740 | 913 | 226 | 186 |
2 | 98 | 189 | 208 | e146 | 326 | 661 | 515 | 1710 | 1490 | 839 | 189 | 166 |
3 | 94 | 185 | 202 | e143 | 320 | 579 | 578 | 1520 | 1390 | 777 | 166 | 150 |
4 | 94 | 174 | 197 | e145 | 245 | 524 | 673 | 1290 | 1410 | 727 | 150 | 135 |
5 | 145 | 163 | 199 | 155 | 252 | 542 | 657 | 1170 | 4400 | 674 | 142 | 124 |
6 | 171 | 157 | 197 | 168 | 274 | 576 | 608 | 1130 | 4000 | 637 | 143 | 116 |
7 | 182 | 154 | 192 | 171 | 272 | 718 | 639 | 1100 | 2510 | 677 | 134 | 109 |
8 | 180 | 154 | 188 | 171 | 234 | 974 | 1210 | 1010 | 2020 | 656 | 129 | 104 |
9 | 154 | 143 | 181 | 174 | 237 | 1650 | 3300 | 1180 | 1770 | 574 | 122 | 99 |
10 | 143 | 140 | 175 | 180 | 576 | 1980 | 3400 | 1180 | 1610 | 526 | 112 | e94 |
11 | 136 | 135 | 167 | 187 | 906 | 1480 | 2500 | 3110 | 1780 | 562 | 106 | 88 |
12 | 154 | 135 | 171 | 189 | 948 | 1230 | 2010 | 10000 | 2970 | 744 | 100 | 86 |
13 | 227 | 132 | 201 | 186 | 848 | 1070 | 1690 | 11800 | 6180 | 516 | 100 | 83 |
14 | 414 | 132 | 272 | 186 | 777 | 956 | 1480 | 8900 | 9160 | 440 | 1470 | 82 |
15 | 493 | 131 | 312 | 176 | 759 | 865 | 1360 | 8110 | 7280 | 385 | 1130 | 84 |
16 | 370 | 130 | 291 | 170 | 706 | 766 | 1240 | 5560 | 3400 | 340 | 400 | 81 |
17 | 266 | 130 | 266 | 152 | 675 | 678 | 1130 | 3610 | 2450 | 306 | 248 | 78 |
18 | 213 | 131 | 263 | 153 | 634 | 645 | 1050 | 3100 | 2040 | 284 | 189 | 78 |
19 | 178 | 135 | 256 | 148 | 653 | 615 | 985 | 2650 | 1790 | 300 | 369 | 84 |
20 | 160 | 134 | 234 | e149 | 851 | 590 | 921 | 2340 | 1620 | 289 | 644 | 91 |
21 | 149 | 148 | 219 | 150 | e1060 | 568 | 965 | 2100 | 1470 | 255 | 446 | 90 |
22 | 161 | 171 | 221 | 148 | 1150 | 499 | 1060 | 1920 | 1360 | 223 | 258 | 85 |
23 | 301 | 169 | 266 | 162 | 1010 | 475 | 987 | 1810 | 1270 | 199 | 2610 | 82 |
24 | 409 | 187 | 283 | 164 | 922 | 509 | 934 | 2670 | 1180 | 180 | 4510 | 80 |
25 | 513 | 270 | e250 | 159 | 849 | 508 | 1230 | 2910 | 1090 | 168 | 1880 | 74 |
26 | 389 | 283 | e260 | 155 | 768 | 493 | 1170 | 3160 | 1050 | 162 | 885 | 70 |
27 | 299 | 276 | e280 | 146 | 665 | 487 | 1310 | 2530 | 1090 | 836 | 733 | 69 |
28 | 250 | 245 | e230 | 152 | 567 | 496 | 3160 | 2150 | 1420 | 1120 | 415 | 69 |
29 | 219 | 227 | e200 | 151 | --- | 532 | 2670 | 1940 | 1320 | 717 | 304 | 68 |
30 | 201 | 218 | e165 | 157 | --- | 597 | 2020 | 1740 | 1010 | 528 | 248 | 66 |
31 | 192 | --- | e155 | 195 | --- | 562 | --- | 1600 | --- | 311 | 211 | --- |
TOTAL | 7055 | 5173 | 6913 | 5038 | 17825 | 23432 | 41975 | 96710 | 73270 | 15865 | 18769 | 2871 |
MEAN | 227.6 | 172.4 | 223.0 | 162.5 | 636.6 | 755.9 | 1399 | 3120 | 2442 | 511.8 | 605.5 | 95.70 |
MAX | 513 | 283 | 312 | 195 | 1150 | 1980 | 3400 | 11800 | 9160 | 1120 | 4510 | 186 |
MIN | 94 | 130 | 155 | 143 | 234 | 475 | 515 | 1010 | 1010 | 162 | 100 | 66 |
CFSM | 0.21 | 0.16 | 0.21 | 0.15 | 0.59 | 0.71 | 1.31 | 2.91 | 2.28 | 0.48 | 0.56 | 0.09 |
IN. | 0.24 | 0.18 | 0.24 | 0.17 | 0.62 | 0.81 | 1.46 | 3.36 | 2.54 | 0.55 | 0.65 | 0.10 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 299.5 | 389.8 | 457.6 | 659.3 | 976.9 | 1192 | 1314 | 1260 | 1154 | 719.2 | 333.0 | 346.3 |
MAX | 3647 | 2196 | 3090 | 3262 | 3963 | 4185 | 3905 | 4793 | 6036 | 4654 | 2989 | 3715 |
(WY) | 1987 | 1986 | 1983 | 1974 | 2001 | 1979 | 1983 | 1995 | 1974 | 1993 | 1993 | 1970 |
MIN | 15.1 | 23.0 | 14.3 | 11.3 | 35.4 | 132 | 71.2 | 94.3 | 80.8 | 30.2 | 11.1 | 10.4 |
(WY) | 1964 | 1950 | 1964 | 1977 | 1989 | 1956 | 1956 | 1989 | 1963 | 1988 | 1989 | 1988 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1943 - 2002 | |||
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ANNUAL TOTAL | 356505 | 314896 | ||||
ANNUAL MEAN | 976.7 | 862.7 | 756.4 | |||
HIGHEST ANNUAL MEAN | 2205 | 1993 | ||||
LOWEST ANNUAL MEAN | 150 | 1989 | ||||
HIGHEST DAILY MEAN | 9840 | Feb 10 | 11800 | May 13 | 35100 | Jun 23 1974 |
LOWEST DAILY MEAN | 80 | Sep 17 | 66 | Sep 30 | 3.0 | Sep 15 1988 |
ANNUAL SEVEN-DAY MINIMUM | 86 | Sep 2 | 71 | Sep 24 | 3.3 | Sep 12 1988 |
MAXIMUM PEAK FLOW | 13200 | May 13 | 41000 | Jun 23 1974 | ||
MAXIMUM PEAK STAGE | 23.29 | May 13 | 28.03 A | Jun 23 1974 | ||
INSTANTANEOUS LOW FLOW | 63 | Sep 30 | 2.6 | Sep 16 1988 | ||
ANNUAL RUNOFF (CFSM) | 0.91 | 0.80 | 0.71 | |||
ANNUAL RUNOFF (INCHES) | 12.37 | 10.93 | 9.59 | |||
10 PERCENT EXCEEDS | 2250 | 1990 | 1740 | |||
50 PERCENT EXCEEDS | 307 | 312 | 329 | |||
90 PERCENT EXCEEDS | 128 | 130 | 45 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |