LOCATION.-- Lat 40°28'16", long 89°01'48" (NAD of 1927), in NE1/4NW1/4 sec.7, T.23 N., R.2 E., McLean County, Hydrologic Unit 07130009, on left bank at Bloomington-Normal Sanitary District sewage-treatment plant, 250 ft upstream from bridge on Interstate 74, 0.4 mi west of Bloomington, and at mile 48.8. |
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DRAINAGE AREA.-- 34.4 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1974 to current year. |
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STAGE: Water years 1994 to current year. |
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REVISED RECORDS.-- WDR IL-82-2: Drainage area. WDR IL-87-2: 1985. |
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GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 725.11 ft above NGVD of 1929. Prior to Nov. 4, 1987, 200 ft upstream at same datum. |
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REMARKS.-- Sewage-treatment plant effluent 300 ft upstream contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,600 ft3/s, Dec. 3, 1982, gage height, 14.02 ft, from floodmark; minimum daily, 9.0 ft3/s, Dec. 25, 1976. |
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REMARKS FOR CURRENT YEAR.-- Records fair. Effluent from sewage-treatment plant upstream averaged 33.1 ft3/s and contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 21 | 21 | 26 | 30 | 23 | 28 | 103 | 62 | 141 | 24 | 22 | 22 |
2 | 20 | 22 | 25 | 32 | 26 | 27 | 80 | 70 | 94 | 27 | 23 | 21 |
3 | 20 | 38 | 25 | 32 | 30 | 26 | 69 | 46 | 74 | 112 | 23 | 20 |
4 | 20 | 46 | 29 | 74 | 25 | 164 | 59 | 50 | 62 | 73 | 91 | 19 |
5 | 18 | 91 | 53 | 43 | 24 | 274 | 53 | 39 | 54 | 33 | 22 | 17 |
6 | 19 | 29 | 36 | 33 | 25 | 94 | 52 | 35 | 48 | 28 | 19 | 18 |
7 | 18 | 25 | 30 | 31 | 25 | 66 | 49 | 31 | 47 | 27 | 17 | 18 |
8 | 19 | 22 | 29 | 34 | 24 | 57 | 45 | 30 | 46 | 26 | 17 | 19 |
9 | 19 | 21 | 36 | 32 | 25 | 49 | 42 | 29 | 46 | 132 | 19 | 17 |
10 | 20 | 21 | 71 | 30 | 25 | 42 | 39 | 37 | 249 | 201 | 19 | 17 |
11 | 19 | 24 | 39 | 32 | 26 | 40 | 37 | 50 | 142 | 99 | 18 | 16 |
12 | 18 | 23 | 33 | 33 | 25 | 36 | 38 | 64 | 74 | 72 | 18 | 16 |
13 | 19 | 22 | 32 | 31 | 24 | 33 | 37 | 53 | 59 | 68 | 18 | 17 |
14 | 108 | 22 | 32 | 31 | 24 | 46 | 37 | 168 | 53 | 48 | 17 | 16 |
15 | 28 | 22 | 33 | 29 | 23 | 35 | 35 | 67 | 75 | 34 | 17 | 63 |
16 | 24 | 22 | 41 | 29 | 22 | 49 | 34 | 44 | 51 | 30 | 18 | 239 |
17 | 22 | 66 | 32 | 46 | 23 | 45 | 34 | 38 | 45 | 28 | 20 | 43 |
18 | 21 | 477 | 37 | 32 | 32 | 46 | 31 | 213 | 39 | 27 | 21 | 29 |
19 | 22 | 111 | 31 | 30 | 50 | 37 | 30 | 104 | 34 | 26 | 20 | 25 |
20 | 22 | 62 | 29 | 28 | 72 | 34 | 54 | 62 | 31 | 25 | 54 | 24 |
21 | 22 | 44 | 29 | 29 | 43 | 31 | 38 | 48 | 43 | 26 | 21 | 23 |
22 | 22 | 39 | 47 | 27 | 34 | 31 | 31 | 44 | 34 | 27 | 19 | 23 |
23 | 21 | 97 | 93 | 27 | 33 | 32 | 29 | 80 | 29 | 25 | 20 | 22 |
24 | 21 | 67 | 50 | 26 | 32 | 39 | 92 | 60 | 29 | 22 | 158 | 22 |
25 | 99 | 43 | 38 | 25 | 30 | 52 | 122 | 299 | 40 | 22 | 393 | 22 |
26 | 27 | 35 | 37 | 26 | 29 | 282 | 52 | 83 | 28 | 22 | 137 | 22 |
27 | 24 | 31 | 35 | 27 | 28 | 110 | 38 | 61 | 26 | 23 | 57 | 22 |
28 | 25 | 28 | 57 | 25 | 27 | 187 | 36 | 50 | 26 | 23 | 42 | 21 |
29 | 23 | 28 | 41 | 25 | 27 | 133 | 34 | 42 | 26 | 23 | 56 | 21 |
30 | 22 | 27 | 35 | 24 | --- | 191 | 73 | 747 | 24 | 39 | 30 | 22 |
31 | 22 | --- | 31 | 23 | --- | 163 | --- | 352 | --- | 24 | 26 | --- |
TOTAL | 825 | 1626 | 1192 | 976 | 856 | 2479 | 1503 | 3158 | 1769 | 1416 | 1452 | 896 |
MEAN | 26.6 | 54.2 | 38.5 | 31.5 | 29.5 | 80.0 | 50.1 | 102 | 59.0 | 45.7 | 46.8 | 29.9 |
MAX | 108 | 477 | 93 | 74 | 72 | 282 | 122 | 747 | 249 | 201 | 393 | 239 |
MIN | 18 | 21 | 25 | 23 | 22 | 26 | 29 | 29 | 24 | 22 | 17 | 16 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 35.5 | 45.0 | 50.0 | 39.8 | 57.2 | 78.7 | 69.9 | 76.4 | 55.7 | 45.6 | 44.4 | 40.4 |
MAX | 152 | 203 | 201 | 130 | 148 | 238 | 146 | 181 | 118 | 135 | 138 | 178 |
(WY) | 1987 | 1986 | 1983 | 1993 | 1976 | 1979 | 1979 | 1984 | 1993 | 2003 | 1981 | 1993 |
MIN | 17.1 | 17.5 | 14.0 | 15.5 | 22.5 | 29.6 | 28.1 | 28.0 | 21.1 | 17.2 | 16.5 | 17.0 |
(WY) | 1975 | 1977 | 1977 | 1977 | 1980 | 1981 | 1977 | 1987 | 1988 | 1994 | 1988 | 1998 |
SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1975 - 2004 | |||
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ANNUAL TOTAL | 18623 | 18148 | ||||
ANNUAL MEAN | 51.0 | 49.6 | 53.2 | |||
HIGHEST ANNUAL MEAN | 99.6 | 1993 | ||||
LOWEST ANNUAL MEAN | 31.7 | 2000 | ||||
HIGHEST DAILY MEAN | 1450 | Jul 10 | 747 | May 30 | 2500 | Mar 4 1979 |
LOWEST DAILY MEAN | 18 | A | 16 | B | 9.0 | Dec 25 1976 |
ANNUAL SEVEN-DAY MINIMUM | 19 | Oct 5 | 17 | Sep 8 | 11 | Jul 31 2001 |
MAXIMUM PEAK FLOW | 2600 | May 30 | 6600 | Dec 3 1982 | ||
MAXIMUM PEAK STAGE | 8.54 | May 30 | 14.02 C | Dec 3 1982 | ||
INSTANTANEOUS LOW FLOW | 5.0 | Oct 8 | ||||
10 PERCENT EXCEEDS | 78 | 91 | 96 | |||
50 PERCENT EXCEEDS | 32 | 31 | 31 | |||
90 PERCENT EXCEEDS | 22 | 20 | 18 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |