LOCATION.-- Lat 40°52'40", long 88°38'10" (NAD of 1927), in SE1/4SW1/4 sec.22, T.28 N., R.5 E., Livingston County, Hydrologic Unit 07130002, near center of span on downstream side of bridge on Vermilion Street in Pontiac, 0.1 mi upstream from State Highway 116, 0.8 mi upstream from Turtle Creek, and at mile 60.3. |
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DRAINAGE AREA.-- 579 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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REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-83-2: 1951, 1957, 1965(M), 1968, 1970, 1980. WDR IL-98: 1997 (P). |
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GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 619.45 ft above NGVD of 1929. Prior to Nov. 8, 1965, nonrecording gage at same site and datum. |
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REMARKS.-- An average of 3 ft3/s, diverted 0.5 mi upstream from station for water supply of city of Pontiac, is not included in records. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 13,100 ft3/s, Dec. 4, 1982, gage height; 19.16 ft; no flow for many days in 1953, 1983-84, 1986-91. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are 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 | 11 | 33 | 16 | 75 | 23 | e22 | 92 | 172 | 690 | 158 | 107 | 49 |
2 | 11 | 36 | 17 | 81 | 26 | e21 | 91 | 264 | 468 | 146 | 95 | 112 |
3 | 11 | 37 | 18 | 62 | 29 | 22 | 92 | 263 | 360 | 125 | 92 | 164 |
4 | 12 | 37 | 17 | 50 | 29 | 24 | 113 | 234 | 307 | 110 | 93 | 100 |
5 | 16 | 38 | 17 | 50 | 32 | 24 | 238 | 710 | 264 | 99 | 136 | 61 |
6 | 19 | 40 | 15 | 47 | 38 | 24 | 538 | 1450 | 233 | 92 | 121 | 45 |
7 | 14 | 38 | 15 | 42 | 34 | 26 | 532 | 1050 | 221 | 90 | 87 | 34 |
8 | 14 | 33 | 15 | 38 | 28 | 33 | 1080 | 802 | 210 | 114 | 71 | 28 |
9 | 15 | 36 | 14 | 35 | 23 | 47 | 973 | 1440 | 198 | 221 | 61 | 24 |
10 | 15 | 33 | 14 | 36 | 21 | 98 | 701 | 1860 | 185 | 1280 | 51 | 17 |
11 | 14 | 31 | 14 | 26 | 17 | 118 | 527 | 1840 | 175 | 2060 | 43 | 18 |
12 | 13 | 35 | 13 | 31 | 11 | 103 | 426 | 1470 | 171 | 1450 | 40 | 17 |
13 | 15 | 33 | 12 | 33 | 15 | 116 | 344 | 1030 | 241 | 1040 | 40 | 15 |
14 | 22 | 28 | 13 | 31 | 16 | 137 | 288 | 787 | 1400 | 682 | 40 | 14 |
15 | 19 | 28 | 13 | 27 | 17 | 132 | 256 | 1530 | 1360 | 486 | 37 | 13 |
16 | 17 | 27 | 14 | 26 | 14 | 105 | 240 | 1670 | 891 | 558 | 28 | 11 |
17 | 16 | 26 | 15 | 26 | 13 | 92 | 231 | 1180 | 610 | 488 | 24 | 8.3 |
18 | 15 | 25 | 25 | 25 | 13 | 93 | 205 | 875 | 474 | 2230 | 22 | 8.7 |
19 | 18 | 24 | 34 | 23 | 13 | 91 | 185 | 702 | 453 | 4420 | 18 | 7.8 |
20 | 20 | 24 | 44 | e21 | 14 | 92 | 175 | 588 | 566 | 2720 | 14 | 8.6 |
21 | 21 | 22 | 56 | e20 | 16 | 137 | 176 | 494 | 468 | 1460 | 13 | 8.0 |
22 | 17 | 24 | 53 | e19 | 19 | 308 | 171 | 419 | 369 | 968 | 8.7 | 7.0 |
23 | 19 | 25 | 41 | e17 | 22 | 278 | 153 | 376 | 303 | 691 | 7.2 | 6.8 |
24 | 21 | 24 | 35 | e16 | e24 | 199 | 137 | 344 | 258 | 509 | 6.0 | 5.1 |
25 | 24 | 24 | 36 | 16 | e25 | 163 | 141 | 317 | 222 | 384 | 4.6 | 5.2 |
26 | 24 | 24 | 35 | 17 | e26 | 147 | 146 | 288 | 196 | 293 | 4.1 | 12 |
27 | 25 | 21 | 31 | 16 | e25 | 143 | 137 | 259 | 180 | 233 | 3.4 | 9.8 |
28 | 28 | 20 | 29 | 16 | e23 | 134 | 125 | 246 | 161 | 198 | 3.3 | 9.8 |
29 | 33 | 19 | 28 | 18 | --- | 128 | 121 | 260 | 152 | 171 | 7.7 | 9.9 |
30 | 33 | 16 | 29 | 19 | --- | 122 | 131 | 287 | 146 | 145 | 8.7 | 9.8 |
31 | 30 | --- | 35 | 21 | --- | 107 | --- | 410 | --- | 125 | 15 | --- |
TOTAL | 582 | 861 | 763 | 980 | 606 | 3286 | 8765 | 23617 | 11932 | 23746 | 1301.7 | 838.8 |
MEAN | 18.8 | 28.7 | 24.6 | 31.6 | 21.6 | 106 | 292 | 762 | 398 | 766 | 42.0 | 28.0 |
MAX | 33 | 40 | 56 | 81 | 38 | 308 | 1080 | 1860 | 1400 | 4420 | 136 | 164 |
MIN | 11 | 16 | 12 | 16 | 11 | 21 | 91 | 172 | 146 | 90 | 3.3 | 5.1 |
CFSM | 0.03 | 0.05 | 0.04 | 0.05 | 0.04 | 0.18 | 0.50 | 1.32 | 0.69 | 1.32 | 0.07 | 0.05 |
IN. | 0.04 | 0.06 | 0.05 | 0.06 | 0.04 | 0.21 | 0.56 | 1.52 | 0.77 | 1.53 | 0.08 | 0.05 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 139 | 224 | 327 | 357 | 514 | 731 | 802 | 739 | 571 | 327 | 122 | 116 |
MAX | 1682 | 2327 | 2773 | 1981 | 1856 | 3123 | 2801 | 2968 | 2232 | 2350 | 1186 | 1540 |
(WY) | 1994 | 1986 | 1983 | 1993 | 2001 | 1979 | 1957 | 1943 | 1980 | 1951 | 1943 | 1989 |
MIN | 0.000 | 0.93 | 4.58 | 3.03 | 6.71 | 23.2 | 109 | 71.1 | 27.0 | 0.000 | 0.000 | 0.000 |
(WY) | 1989 | 2000 | 1954 | 1977 | 1963 | 2000 | 1977 | 1964 | 1988 | 1988 | 1988 | 1988 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1943 - 2003 | |||
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ANNUAL TOTAL | 184169 | 77278.5 | ||||
ANNUAL MEAN | 505 | 212 | 413 | |||
HIGHEST ANNUAL MEAN | 1094 | 1993 | ||||
LOWEST ANNUAL MEAN | 49.7 | 1964 | ||||
HIGHEST DAILY MEAN | 9780 | May 13 | 4420 | Jul 19 | 12300 | Dec 4 1982 |
LOWEST DAILY MEAN | 11 | Oct 1-3 | 3.3 | Aug 28 | 0.00 | A |
ANNUAL SEVEN-DAY MINIMUM | 12 | Sep 29 | 5.2 | Aug 23 | 0.00 | Jul 1 1988 |
MAXIMUM PEAK FLOW | 4690 | Jul 19 | 13100 | Dec 4 1982 | ||
MAXIMUM PEAK STAGE | 10.73 | Jul 19 | 19.16 | Dec 4 1982 | ||
INSTANTANEOUS LOW FLOW | 3.1 | Aug 27,28 | ||||
ANNUAL RUNOFF (CFSM) | 0.87 | 0.37 | 0.71 | |||
ANNUAL RUNOFF (INCHES) | 11.83 | 4.97 | 9.70 | |||
10 PERCENT EXCEEDS | 1190 | 561 | 1050 | |||
50 PERCENT EXCEEDS | 169 | 37 | 131 | |||
90 PERCENT EXCEEDS | 18 | 13 | 6.6 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |