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) (609.75 ft NAVD 1988). |
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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 fair except those for estimated daily discharges, which are poor. |
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 | 481 | 1620 | e170 | 287 | 379 | 270 | 103 | 37 | 14 | 11 | 10 |
2 | 11 | 725 | 1620 | e180 | 269 | 360 | 277 | 91 | 38 | 14 | 10 | 9.8 |
3 | 11 | 733 | 1590 | e190 | 245 | 347 | 253 | 89 | 33 | 13 | 10 | 9.4 |
4 | 10 | 847 | 1360 | 603 | 232 | 326 | 241 | 87 | 31 | 14 | 10 | 9.3 |
5 | 10 | 803 | 1050 | 1370 | 239 | 304 | 224 | 86 | 29 | 21 | 10 | 9.0 |
6 | 10 | 741 | 887 | 2200 | 259 | 281 | 212 | 82 | 26 | 14 | 10 | 8.9 |
7 | 10 | 670 | 1320 | 2430 | 330 | 256 | 218 | 77 | 25 | 13 | 9.9 | 8.9 |
8 | 11 | 594 | 1750 | 2390 | 472 | 263 | 211 | 77 | 24 | 14 | 9.7 | 8.4 |
9 | 11 | 518 | 2070 | 2040 | 561 | 246 | 186 | 76 | 24 | 13 | 9.7 | 8.2 |
10 | 10 | 457 | 2050 | 1710 | 579 | 229 | 170 | 77 | 23 | 12 | 9.6 | 8.2 |
11 | 10 | 430 | 1740 | 1550 | 569 | 214 | 162 | 79 | 24 | 12 | 9.7 | 8.2 |
12 | 12 | 402 | 1350 | 1880 | 552 | 207 | 176 | 110 | 23 | 18 | 10 | 8.3 |
13 | 19 | 345 | 928 | 4720 | 665 | 208 | 198 | 87 | 24 | 22 | 14 | 7.8 |
14 | 12 | 307 | 751 | e7050 | 1200 | 193 | 174 | 64 | 32 | 14 | 14 | 8.4 |
15 | 14 | 266 | 633 | e5430 | 1260 | 181 | 152 | 59 | 29 | 13 | 14 | 9.4 |
16 | 12 | 241 | 545 | e3840 | 1500 | 177 | 139 | 58 | 25 | 16 | 11 | 9.9 |
17 | 11 | 224 | 502 | e2990 | 1370 | 168 | 129 | 58 | 25 | 13 | 10 | 8.9 |
18 | 54 | 214 | 457 | e2300 | 1120 | 159 | 127 | 53 | 26 | 24 | 11 | 8.5 |
19 | 95 | 237 | 422 | e1710 | 890 | 152 | 121 | 56 | 24 | 27 | e83 | 15 |
20 | 57 | 244 | 380 | 1260 | 769 | 147 | 109 | 75 | 21 | 15 | e42 | 20 |
21 | 39 | 237 | 347 | 877 | 691 | 153 | 135 | 76 | 18 | 13 | e20 | 11 |
22 | 34 | 228 | 328 | 666 | 629 | 160 | 152 | 72 | 17 | 13 | e16 | 8.9 |
23 | 33 | 216 | 297 | 540 | 584 | 206 | 154 | 61 | 17 | 12 | 13 | 8.6 |
24 | 29 | 279 | 267 | 471 | 547 | 201 | 129 | 61 | 16 | 12 | 12 | 9.0 |
25 | 25 | 386 | e240 | 439 | 504 | 260 | 119 | 60 | 16 | 12 | 11 | 12 |
26 | 28 | 437 | e220 | 420 | 477 | 306 | 113 | 51 | 16 | 11 | 11 | 14 |
27 | 143 | 591 | e200 | 405 | 451 | 305 | 117 | 44 | 16 | 12 | 11 | 10 |
28 | 170 | 826 | e190 | 375 | 415 | 310 | 112 | 38 | 15 | 11 | 10 | 9.6 |
29 | 244 | 988 | e180 | 345 | --- | 290 | 115 | 36 | 15 | 11 | 10 | 13 |
30 | 277 | 1300 | e170 | 334 | --- | 276 | 117 | 36 | 15 | 11 | 10 | 10 |
31 | 306 | --- | e165 | 314 | --- | 253 | --- | 39 | --- | 11 | 10 | --- |
TOTAL | 1729 | 14967 | 25629 | 51199 | 17666 | 7517 | 5012 | 2118 | 704 | 445 | 452.6 | 300.6 |
MEAN | 55.8 | 499 | 827 | 1652 | 631 | 242 | 167 | 68.3 | 23.5 | 14.4 | 14.6 | 10.0 |
MAX | 306 | 1300 | 2070 | 7050 | 1500 | 379 | 277 | 110 | 38 | 27 | 83 | 20 |
MIN | 10 | 214 | 165 | 170 | 232 | 147 | 109 | 36 | 15 | 11 | 9.6 | 7.8 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 2005, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 103 | 172 | 250 | 258 | 332 | 518 | 467 | 500 | 341 | 216 | 128 | 56.0 |
MAX | 1069 | 1236 | 1268 | 1652 | 975 | 2129 | 1704 | 1648 | 850 | 1370 | 1576 | 658 |
(WY) | 1994 | 1986 | 1983 | 2005 | 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 2004 CALENDAR YEAR | FOR 2005 WATER YEAR | WATER YEARS 1978 - 2005 | |||
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ANNUAL TOTAL | 120872 | 127739.2 | ||||
ANNUAL MEAN | 330 | 350 | 278 | |||
HIGHEST ANNUAL MEAN | 601 | 1993 | ||||
LOWEST ANNUAL MEAN | 56.3 | 2000 | ||||
HIGHEST DAILY MEAN | 2070 | Dec 9 | 7050 A | Jan 14 | 7050 | Jan 14 2005 |
LOWEST DAILY MEAN | 10 | B | 7.8 | Sep 13 | 3.7 | Sep 8 1988 |
ANNUAL SEVEN-DAY MINIMUM | 10 | Oct 4 | 8.2 | Sep 8 | 4.1 | Sep 4 1988 |
MAXIMUM PEAK FLOW | 7600 | Jan 14 | 7810 | Apr 13 1994 | ||
MAXIMUM PEAK STAGE | 23.28 | Jan 14 | 24.04 | Apr 13 1994 | ||
INSTANTANEOUS LOW FLOW | 7.5 | Sep 13 | ||||
10 PERCENT EXCEEDS | 849 | 888 | 708 | |||
50 PERCENT EXCEEDS | 198 | 115 | 110 | |||
90 PERCENT EXCEEDS | 16 | 10 | 11 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |