LOCATION.-- Lat 41°52'54", long 87°52'09" (NAD of 1927), in SW1/4SE1/4 sec.9, T.39 N., R.12 E., Cook County, Hydrologic Unit 07120004, on right bank at downstream side of bridge on Washington Boulevard in Bellwood, 1,050 ft upstream from railroad bridge, and at mile 3.2. | |
DRAINAGE AREA.-- 17.9 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: August 1950 to June 1951, October 1951 to current year. | |
STAGE: Water years 1994-2002. | |
SURFACE-WATER QUALITY | |
CHEMICAL: Water years 1979-91, July 2000. | |
MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000. | |
BIOLOGICAL | |
BENTHIC MACROINVERTEBRATES: Water year 2000. | |
HABITAT: Water year 2000. | |
REVISED RECORDS.-- WSP 1338: 1952. WSP 1708: 1958, 1959(P). WDR IL-75-1: Drainage area. | |
GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 617.65 ft above NGVD of 1929 (Cook County Highway Department bench mark). Prior to Oct. 26, 1951, at datum 2.00 ft higher. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,120 ft3/s, Aug. 14, 1987, gage height, 12.84 ft; no flow Sept. 14, 1962. | |
REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. | |
| DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 12 | 44 | 13 | 7.3 | 21 | 9.0 | 19 | 15 | 7.1 | 3.7 | 1.7 | 5.1 |
| 2 | 11 | 35 | 10 | 5.6 | 12 | 18 | 33 | 30 | 6.8 | 3.5 | 7.0 | 56 |
| 3 | 11 | 30 | 9.3 | 6.2 | 9.6 | 20 | 24 | 23 | 8.4 | 2.5 | 3.2 | 13 |
| 4 | 46 | 12 | 8.9 | 5.7 | 11 | 15 | 18 | 12 | 144 | 6.2 | 8.0 | 15 |
| 5 | 82 | 8.4 | 9.6 | 5.7 | 9.2 | 11 | 12 | 10 | 79 | 3.2 | 24 | 12 |
| 6 | 47 | 8.8 | 10 | 6.0 | 8.2 | 23 | 11 | 15 | 59 | 2.7 | 12 | 4.3 |
| 7 | 38 | 8.0 | 8.3 | 5.3 | 10 | 30 | 31 | 11 | 20 | 2.1 | 6.2 | 2.8 |
| 8 | 16 | 8.5 | 8.5 | 5.6 | 15 | 73 | 82 | 16 | 26 | 2.4 | 5.5 | 2.6 |
| 9 | 10 | 8.0 | 7.4 | 6.9 | 20 | 103 | 81 | 34 | 6.3 | 143 | 5.5 | 5.7 |
| 10 | 16 | 8.2 | 7.0 | 6.4 | 29 | 58 | 34 | 12 | 31 | 42 | 3.6 | 12 |
| 11 | 19 | 7.2 | 7.1 | 6.1 | 21 | 37 | 28 | 104 | 56 | 24 | 4.0 | 4.6 |
| 12 | 63 | 6.5 | 12 | 6.3 | 25 | 32 | 32 | 145 | 41 | 14 | 3.6 | 2.6 |
| 13 | 242 | 6.7 | 46 | 5.6 | 22 | 26 | 26 | 76 | 32 | 13 | 44 | 2.0 |
| 14 | 133 | 15 | 22 | 6.1 | 14 | 25 | 24 | 74 | 47 | 11 | 50 | 9.4 |
| 15 | 83 | 8.6 | 10 | 6.1 | 11 | 25 | 23 | 39 | 36 | 10 | 38 | 8.7 |
| 16 | 84 | 6.9 | 12 | 6.6 | 9.9 | 21 | 13 | 88 | 24 | 5.7 | 22 | 2.6 |
| 17 | 75 | 6.9 | 18 | e7.3 | 8.6 | 12 | 23 | 66 | 15 | 2.0 | 13 | 6.6 |
| 18 | 78 | 6.3 | 12 | e7.8 | 8.7 | 11 | 11 | 48 | 14 | 1.5 | 12 | 14 |
| 19 | 48 | 18 | 18 | e6.5 | 30 | 10 | 12 | 29 | 12 | 1.6 | 17 | 17 |
| 20 | 43 | 16 | 13 | 6.1 | 50 | 12 | 50 | 26 | 8.6 | 1.7 | 4.9 | 20 |
| 21 | 42 | 7.0 | 10 | 6.5 | 32 | 9.7 | 41 | 25 | 4.5 | 3.0 | 2.7 | 18 |
| 22 | 35 | 6.3 | 10 | 8.4 | 19 | 9.2 | 22 | 21 | 3.3 | 2.1 | 211 | 16 |
| 23 | 108 | 5.8 | 13 | 7.5 | 15 | 9.4 | 14 | 12 | 5.3 | 9.3 | 80 | 5.4 |
| 24 | 127 | 15 | 8.4 | 7.0 | 12 | 8.4 | 31 | 13 | 11 | 9.2 | 61 | 13 |
| 25 | 82 | 28 | 8.5 | 6.7 | 11 | 9.1 | 24 | 15 | 25 | 8.9 | 55 | 6.1 |
| 26 | 61 | 10 | 8.2 | 6.5 | 13 | 10 | 13 | 11 | 10 | 3.8 | 41 | 3.9 |
| 27 | e48 | 18 | 7.4 | 6.1 | 10 | 9.5 | 47 | 9.1 | 4.8 | 9.7 | 40 | 11 |
| 28 | e50 | 16 | 7.5 | 6.5 | 9.4 | 9.2 | 45 | 8.9 | 5.0 | 4.3 | 38 | 4.2 |
| 29 | e49 | 18 | 7.0 | 6.5 | --- | 46 | 30 | 9.6 | 5.4 | 19 | 31 | 9.2 |
| 30 | e49 | 40 | 7.0 | 7.4 | --- | 23 | 21 | 9.2 | 4.3 | 9.9 | 15 | 7.3 |
| 31 | 48 | --- | 6.9 | 14 | --- | 13 | --- | 7.8 | --- | 2.9 | 13 | --- |
| TOTAL | 1856 | 433.1 | 356.0 | 208.3 | 466.6 | 727.5 | 875 | 1014.6 | 751.8 | 377.9 | 872.9 | 310.1 |
| MEAN | 59.87 | 14.44 | 11.48 | 6.719 | 16.66 | 23.47 | 29.17 | 32.73 | 25.06 | 12.19 | 28.16 | 10.34 |
| MAX | 242 | 44 | 46 | 14 | 50 | 103 | 82 | 145 | 144 | 143 | 211 | 56 |
| MIN | 10 | 5.8 | 6.9 | 5.3 | 8.2 | 8.4 | 11 | 7.8 | 3.3 | 1.5 | 1.7 | 2.0 |
| CFSM | 3.34 | 0.81 | 0.64 | 0.38 | 0.93 | 1.31 | 1.63 | 1.83 | 1.40 | 0.68 | 1.57 | 0.58 |
| IN. | 3.86 | 0.90 | 0.74 | 0.43 | 0.97 | 1.51 | 1.82 | 2.11 | 1.56 | 0.79 | 1.81 | 0.64 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1950 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 13.54 | 14.70 | 13.73 | 13.06 | 16.05 | 23.00 | 27.09 | 20.25 | 17.48 | 14.03 | 16.80 | 14.29 |
| MAX | 59.9 | 44.5 | 53.5 | 39.2 | 51.5 | 72.6 | 59.0 | 57.9 | 41.5 | 46.6 | 103 | 61.4 |
| (WY) | 2002 | 1986 | 1983 | 1993 | 1997 | 1979 | 1983 | 1990 | 1993 | 1957 | 1987 | 1961 |
| MIN | 0.22 | 0.46 | 1.63 | 0.98 | 1.38 | 6.69 | 7.87 | 4.25 | 1.64 | 0.68 | 0.42 | 0.31 |
| (WY) | 1953 | 1954 | 1954 | 1954 | 1963 | 1956 | 1971 | 1952 | 1956 | 1955 | 1953 | 1952 |
| SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1950 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 9318.3 | 8249.8 | ||||
| ANNUAL MEAN | 25.53 | 22.60 | 17.05 | |||
| HIGHEST ANNUAL MEAN | 27.6 | 1983 | ||||
| LOWEST ANNUAL MEAN | 3.98 | 1953 | ||||
| HIGHEST DAILY MEAN | 242 | Oct 13 | 242 | Oct 13 | 768 | Aug 14 1987 |
| LOWEST DAILY MEAN | 1.7 | Jul 21 | 1.5 | Jul 18 | 0.00 | Sep 14 1962 |
| ANNUAL SEVEN-DAY MINIMUM | 3.4 | Jun 30 | 2.5 | Jul 16 | 0.10 | Oct 6 1952 |
| MAXIMUM PEAK FLOW | 652 | Oct 13 | 1120 | Aug 14 1987 | ||
| MAXIMUM PEAK STAGE | 8.97 | Oct 13 | 12.84 | Aug 14 1987 | ||
| INSTANTANEOUS LOW FLOW | 1.4 A | |||||
| ANNUAL RUNOFF (CFSM) | 1.43 | 1.26 | 0.95 | |||
| ANNUAL RUNOFF (INCHES) | 19.37 | 17.14 | 12.94 | |||
| 10 PERCENT EXCEEDS | 61 | 50 | 38 | |||
| 50 PERCENT EXCEEDS | 14 | 12 | 8.6 | |||
| 90 PERCENT EXCEEDS | 5.5 | 5.0 | 2.7 | |||