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. |
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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 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 | 7.5 | 23 | 51 | e72 | 480 | 484 | 325 | 1480 | 296 | 134 | 56 | 242 |
2 | 7.4 | 23 | 41 | e70 | 591 | 580 | 320 | 1200 | 273 | 122 | 48 | 197 |
3 | 7.9 | 21 | 36 | e75 | 623 | 725 | 300 | 866 | 255 | 113 | 46 | 160 |
4 | 6.5 | 20 | 32 | e80 | 598 | 716 | 293 | 669 | 224 | 102 | 36 | 132 |
5 | 14 | 19 | 29 | 85 | 541 | 698 | 275 | 545 | 387 | 95 | 30 | 110 |
6 | 13 | 29 | 28 | 87 | 479 | 681 | 262 | 485 | 461 | 86 | 31 | 90 |
7 | 8.5 | 21 | 25 | 82 | 429 | 693 | 244 | 485 | 446 | 72 | 27 | 73 |
8 | 7.8 | 18 | 24 | 75 | 378 | 687 | 283 | 465 | 412 | 63 | 20 | 60 |
9 | 7.8 | 18 | 23 | 69 | 346 | 868 | 351 | 567 | 379 | 52 | 16 | 52 |
10 | 8.9 | 18 | 21 | 68 | 315 | 947 | 368 | 539 | 349 | 49 | 15 | 45 |
11 | 13 | 17 | 21 | 65 | 295 | 1040 | 365 | 836 | 612 | 48 | 14 | 38 |
12 | 47 | 17 | 21 | 62 | 257 | 940 | 351 | 2000 | 637 | 38 | 13 | 31 |
13 | 20 | 16 | 27 | 59 | 245 | 811 | 347 | 2450 | 692 | 30 | 13 | 24 |
14 | 32 | 16 | 28 | 60 | 227 | 722 | 334 | 3020 | 861 | 28 | 18 | 21 |
15 | 15 | 16 | 33 | 50 | 203 | 631 | 316 | 2790 | 893 | 23 | 17 | 18 |
16 | 23 | 16 | 43 | e49 | 193 | 590 | 296 | 2420 | 791 | 19 | 47 | 19 |
17 | 18 | 16 | 91 | e46 | 187 | 528 | 275 | 2240 | 663 | 18 | 174 | 16 |
18 | 13 | 15 | 95 | e47 | 178 | 458 | 274 | 2000 | 557 | 17 | 140 | 18 |
19 | 12 | 16 | 90 | e48 | 322 | 426 | 265 | 1610 | 476 | 16 | 145 | 18 |
20 | 11 | 15 | 94 | 49 | 800 | 397 | 306 | 1230 | 411 | 16 | 165 | 24 |
21 | 10 | 15 | 106 | 47 | 917 | 361 | 481 | 916 | 360 | 16 | 158 | 22 |
22 | 12 | 15 | 119 | 46 | 1040 | 310 | 426 | 729 | 323 | 29 | 138 | 20 |
23 | 13 | 15 | 124 | 46 | 978 | 281 | 396 | 610 | 289 | 84 | 864 | 17 |
24 | 34 | 20 | 116 | 50 | 850 | 282 | 388 | 553 | 259 | 65 | 1280 | 14 |
25 | 80 | 21 | e108 | 47 | 732 | 348 | 407 | 505 | 234 | 62 | 1270 | 13 |
26 | 48 | 16 | e102 | 42 | 667 | 300 | 367 | 444 | 222 | 52 | 1210 | 14 |
27 | 35 | 16 | e100 | 40 | 578 | 257 | 985 | 400 | 202 | 50 | 876 | 12 |
28 | 29 | 16 | e98 | 42 | 528 | 288 | 1860 | 412 | 185 | 45 | 634 | 12 |
29 | 26 | 20 | e90 | 43 | --- | 302 | 1380 | 454 | 169 | 46 | 480 | 11 |
30 | 24 | 57 | e80 | 62 | --- | 314 | 1550 | 372 | 150 | 55 | 378 | 10 |
31 | 22 | --- | e74 | 376 | --- | 322 | --- | 324 | --- | 59 | 301 | --- |
TOTAL | 626.3 | 581 | 1970 | 2139 | 13977 | 16987 | 14390 | 33616 | 12468 | 1704 | 8660 | 1533 |
MEAN | 20.2 | 19.4 | 63.5 | 69.0 | 499 | 548 | 480 | 1084 | 416 | 55.0 | 279 | 51.1 |
MAX | 80 | 57 | 124 | 376 | 1040 | 1040 | 1860 | 3020 | 893 | 134 | 1280 | 242 |
MIN | 6.5 | 15 | 21 | 40 | 178 | 257 | 244 | 324 | 150 | 16 | 13 | 10 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 113 | 159 | 235 | 213 | 341 | 553 | 491 | 527 | 348 | 223 | 138 | 58.5 |
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 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1978 - 2002 | |||
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ANNUAL TOTAL | 61000.1 | 108651.3 | ||||
ANNUAL MEAN | 167 | 298 | 283 | |||
HIGHEST ANNUAL MEAN | 601 | 1993 | ||||
LOWEST ANNUAL MEAN | 56.3 | 2000 | ||||
HIGHEST DAILY MEAN | 2560 | Feb 27 | 3020 | May 14 | 6960 | Apr 13 1994 |
LOWEST DAILY MEAN | 6.5 | Oct 4 | 6.5 | Oct 4 | 3.7 | Sep 8 1988 |
ANNUAL SEVEN-DAY MINIMUM | 7.5 | Sep 28 | 9.3 | Oct 1 | 4.1 | Sep 4 1988 |
MAXIMUM PEAK FLOW | 3100 | May 14 | 7810 | Apr 13 1994 | ||
MAXIMUM PEAK STAGE | 19.88 | May 14 | 24.04 | Apr 13 1994 | ||
INSTANTANEOUS LOW FLOW | 5.6 | Oct 4 | ||||
10 PERCENT EXCEEDS | 431 | 756 | 719 | |||
50 PERCENT EXCEEDS | 54 | 98 | 110 | |||
90 PERCENT EXCEEDS | 9.6 | 16 | 11 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |