LOCATION.-- Lat 40°06'54", long 89°02'57" (NAD of 1927), in NE1/4SE1/4 sec.11, T.19 N., R.1 E., De Witt County, Hydrologic Unit 07130009, on right bank at downstream side of bridge on County Road 490 E, 0.5 mi upstream from State Highway 54, 0.8 mi upstream from a railroad bridge and Ten Mile Creek, 3.2 mi northwest of Rowell, and at mile 65.3. |
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DRAINAGE AREA.-- 335 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 to current year. |
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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. WDR IL-04: 2003 |
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GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 610.00 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark). |
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REMARKS.-- Flow partially regulated due to storage at Clinton Reservoir, 11 mi upstream from gage since Oct. 12, 1977. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 24,500 ft3/s, May 16, 1968, gage height, 29.21 ft; maximum discharge after Clinton Reservoir, 7,810 ft3/s, Apr. 13, 1994, gage height 24.04 ft; minimum daily discharge, 0.7 ft3/s, Oct. 4, 1954. |
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REMARKS FOR CURRENT YEAR.-- Records poor. |
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 | 9.9 | 13 | 15 | 18 | e17 | e46 | 120 | 116 | 198 | 67 | 69 | 155 |
2 | 9.9 | 13 | 15 | 25 | e19 | e44 | 109 | 126 | 165 | 63 | 62 | 101 |
3 | 9.8 | 13 | 15 | 18 | e21 | e41 | 109 | 120 | 166 | 58 | 62 | 100 |
4 | 13 | 14 | 15 | 17 | e20 | e40 | 118 | 116 | 147 | 49 | 61 | 94 |
5 | 14 | 15 | 14 | 16 | e19 | e40 | 201 | 206 | 130 | 42 | 52 | 85 |
6 | 11 | 18 | 14 | 16 | e18 | e40 | 251 | 212 | 126 | 42 | 46 | 73 |
7 | 11 | 16 | 14 | 16 | e17 | e41 | 342 | 235 | 132 | 35 | 41 | 62 |
8 | 11 | 14 | 14 | 15 | e16 | e42 | 355 | 229 | 119 | 29 | 39 | 54 |
9 | 10 | 14 | 14 | 15 | e15 | e43 | 378 | 246 | 101 | 60 | 35 | 47 |
10 | 10 | 16 | 14 | 15 | e15 | e42 | 370 | 356 | 106 | 772 | 30 | 42 |
11 | 10 | 16 | 14 | e15 | e14 | e41 | 346 | 416 | 127 | 784 | 26 | 36 |
12 | 10 | 15 | 13 | e15 | e14 | e50 | 331 | 430 | 156 | 817 | 23 | 34 |
13 | 10 | 15 | 13 | e15 | e14 | e70 | 303 | 444 | 161 | 763 | 22 | 28 |
14 | 10 | 15 | 14 | e15 | e14 | 100 | 268 | 423 | 232 | 643 | 22 | 26 |
15 | 11 | 16 | 13 | e15 | e14 | 92 | 234 | 449 | 325 | 533 | 19 | 23 |
16 | 10 | 17 | 13 | e15 | e14 | 91 | 214 | 502 | 331 | 458 | 18 | 20 |
17 | 10 | 16 | 15 | e16 | e15 | 92 | 222 | 486 | 306 | 396 | 18 | 19 |
18 | 10 | 15 | 21 | e18 | e15 | 93 | 206 | 446 | 271 | 365 | 19 | 19 |
19 | 15 | 15 | 26 | e17 | e18 | 122 | 190 | 397 | 252 | 350 | 18 | 18 |
20 | 12 | 16 | 17 | e16 | e30 | 151 | 184 | 358 | 219 | 296 | 17 | 17 |
21 | 11 | 16 | 15 | e15 | e50 | 179 | 176 | 319 | 181 | 372 | 17 | 17 |
22 | 11 | 17 | e14 | e14 | e90 | 179 | 169 | 278 | 160 | 341 | 17 | 17 |
23 | 10 | 16 | e13 | e14 | e80 | 190 | 160 | 240 | 141 | 290 | 16 | 17 |
24 | 10 | 15 | e13 | e13 | e65 | 190 | 151 | 210 | 124 | 242 | 16 | 17 |
25 | 12 | 15 | e13 | e12 | e55 | 190 | 167 | 192 | 108 | 204 | 16 | 18 |
26 | 13 | 15 | e13 | e12 | e52 | 181 | 156 | 180 | 97 | 167 | 16 | 19 |
27 | 11 | 15 | 14 | e12 | e50 | 172 | 132 | 162 | 90 | 135 | 16 | 28 |
28 | 11 | 15 | 14 | e12 | e48 | 164 | 121 | 154 | 77 | 128 | 15 | 17 |
29 | 14 | 15 | 14 | e13 | --- | 161 | 118 | 173 | 69 | 118 | 67 | 16 |
30 | 21 | 15 | 16 | e14 | --- | 153 | 119 | 150 | 71 | 96 | 52 | 15 |
31 | 14 | --- | 19 | e15 | --- | 140 | --- | 235 | --- | 79 | 35 | --- |
TOTAL | 355.6 | 456 | 461 | 474 | 829 | 3220 | 6320 | 8606 | 4888 | 8794 | 982 | 1234 |
MEAN | 11.5 | 15.2 | 14.9 | 15.3 | 29.6 | 104 | 211 | 278 | 163 | 284 | 31.7 | 41.1 |
MAX | 21 | 18 | 26 | 25 | 90 | 190 | 378 | 502 | 331 | 817 | 69 | 155 |
MIN | 9.8 | 13 | 13 | 12 | 14 | 40 | 109 | 116 | 69 | 29 | 15 | 15 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 109 | 154 | 226 | 205 | 329 | 535 | 480 | 517 | 341 | 225 | 134 | 57.8 |
MAX | 1069 | 1236 | 1268 | 1316 | 975 | 2129 | 1704 | 1648 | 850 | 1370 | 1576 | 658 |
(WY) | 1994 | 1986 | 1983 | 1993 | 1982 | 1982 | 1979 | 1995 | 1999 | 1981 | 1981 | 1993 |
MIN | 8.31 | 9.77 | 12.1 | 11.0 | 14.9 | 22.3 | 54.8 | 45.2 | 13.7 | 8.51 | 6.57 | 5.46 |
(WY) | 1989 | 1989 | 1996 | 1980 | 1989 | 2000 | 2000 | 1988 | 1988 | 1988 | 1988 | 1988 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1978 - 2003 | |||
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ANNUAL TOTAL | 106746.6 | 36619.6 | ||||
ANNUAL MEAN | 292 | 100 | 276 | |||
HIGHEST ANNUAL MEAN | 601 | 1993 | ||||
LOWEST ANNUAL MEAN | 56.3 | 2000 | ||||
HIGHEST DAILY MEAN | 3020 | May 14 | 817 | Jul 12 | 6960 | Apr 13 1994 |
LOWEST DAILY MEAN | 9.8 | Oct 3 | 9.8 | Oct 3 | 3.7 | Sep 8 1988 |
ANNUAL SEVEN-DAY MINIMUM | 10 | Oct 8 | 10 | Oct 8 | 4.1 | Sep 4 1988 |
MAXIMUM PEAK FLOW | 876 | Jul 10 | 7810 | Apr 13 1994 | ||
MAXIMUM PEAK STAGE | 16.18 | Jul 10 | 24.04 | Apr 13 1994 | ||
INSTANTANEOUS LOW FLOW | 9.7 | A | ||||
10 PERCENT EXCEEDS | 756 | 283 | 700 | |||
50 PERCENT EXCEEDS | 80 | 35 | 108 | |||
90 PERCENT EXCEEDS | 13 | 13 | 11 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |