Station list     Available data
ILLINOIS RIVER BASIN


05535500                   WEST FORK OF NORTH BRANCH CHICAGO RIVER AT NORTHBROOK, IL



LOCATION.--Lat 42°08'18", long 87°50'04", in SW1/4SE1/4 sec.4, T.42 N., R.12 E., Cook County, Hydrologic Unit 07120003, on left bank at upstream side of bridge on State Highway 68 at Northbrook, and at mile 7.9.

DRAINAGE AREA.--11.5 mi2.

PERIOD OF RECORD.--August 1952 to current year.

GAGE.--Water-stage recorder. Datum of gage is 637.98 ft above sea level (Cook County Highway Department bench mark).

REMARKS.--Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant, 1.7 mi upstream, averaged about 5.4 ft3/s per day, with a maximum of 7.4 ft3/s in February and a minimum of 3.8 ft3/s in October. Gage-height telemeter at station.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 7.5 5.4 11    6.1 41    10    100  11    5.2 7.2 2.9 5.1
2 6.2 4.5 8.4 13    89    11    56  10    4.8 5.0 2.8 4.9
3 3.7 4.5 13    45    41    12    24  9.1 4.6 50    3.5 6.6
4 4.3 4.4 9.0 85    25    9.2 18  8.5 4.6 49    19    5.4
5 3.9 4.5 7.6 65    18    8.4 13  11    6.8 11    12    4.8
 
6 4.6 30    6.5 63    16    8.2 11  15    5.0 7.1 9.1 4.2
7 4.0 8.1 5.4 73    14    7.5 35  144    4.8 35    18    26   
8 4.9 5.7 5.2 59    12    126    158  93    5.3 9.5 10    8.2
9 7.8 5.1 6.3 79    11    136    95  32    15    8.4 5.4 6.3
10 7.5 4.8 66    24    11    60    52  20    7.6 5.8 4.2 5.7
 
11 7.7 4.9 54    12    106    29    25  16    30    3.9 3.7 5.0
12 4.7 4.9 18    e11    118    19    19  12    13    3.0 3.5 4.5
13 19    4.7 12    e10    36    18    18  22    18    3.1 3.4 4.5
14 6.3 6.7 8.8 e9.8 21    19    15  14    7.0 3.0 3.4 18   
15 4.2 29    9.1 e9.0 18    17    14  11    5.2 3.0 3.7 18   
 
16 3.7 12    9.8 e8.6 20    15    38  9.1 3.4 3.1 3.1 8.3
17 3.4 8.0 9.4 e8.0 65    75    23  8.2 4.2 3.0 3.6 6.7
18 3.1 7.2 8.2 e7.5 104    207    17  6.8 25    2.9 3.3 6.1
19 3.1 6.4 7.8 e7.2 35    126    12  5.1 23    5.2 3.3 5.1
20 3.2 10    7.3 7.0 24    53    23  4.6 7.8 3.4 3.3 16   
 
21 3.2 12    7.1 7.3 18    32    37  4.1 4.2 4.1 3.5 8.5
22 3.2 9.8 12    8.6 15    24    23  3.8 3.7 3.7 3.6 6.3
23 3.5 7.8 7.7 10    13    20    16  3.8 3.5 4.4 3.3 5.1
24 7.7 6.8 8.9 8.5 16    18    12  4.5 3.1 4.1 4.1 6.6
25 7.6 6.5 46    7.6 11    17    10  6.1 13    3.6 21    5.2
 
26 80    6.7 16    8.7 9.6 12    27  6.0 105    3.1 6.9 5.0
27 74    20    10    10    18    9.5 20  5.2 33    3.7 5.5 4.6
28 12    11    7.7 11    12    14    13  5.1 74    3.7 18    5.2
29 7.1 15    8.4 19    ---    9.2 16  7.1 20    3.4 7.6 5.1
30 6.3 14    7.3 15    ---    8.9 12  5.3 9.9 3.2 5.6 9.6
 
31 5.3 ---    6.2 15    ---    101    ---  5.2 ---    3.2 5.7 ---   

TOTAL 322.7 280.4 420.1 722.9 937.6 1231.9 952 518.6 469.7 261.8 206.0 230.6
MEAN 10.4 9.35 13.6 23.3 33.5 39.7 31.7 16.7 15.7 8.45 6.65 7.69
MAX 80 30 66 85 118 207 158 144 105 50 21 26
MIN 3.1 4.4 5.2 6.1 9.6 7.5 10 3.8 3.1 2.9 2.8 4.2
CFSM .91 .81 1.18 2.03 2.91 3.46 2.76 1.45 1.36 .73 .58 .67
IN. 1.04 .91 1.36 2.34 3.03 3.98 3.08 1.68 1.52 .85 .67 .75

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 1998, BY WATER YEAR (WY)
MEAN 8.08 11.2 12.2 9.58 13.9 23.7 24.8 15.6 14.1 11.2 10.8 9.74
MAX 23.1 40.4 51.2 40.0 43.2 86.6 57.3 67.3 41.6 59.2 57.5 50.0
(WY) 1987 1986 1983 1974 1997 1979 1983 1996 1978 1982 1987 1986
MIN .24 .34 .54 .38 1.04 3.01 6.58 4.61 1.51 .50 .47 .24
(WY) 1954 1954 1954 1954 1963 1956 1953 1953 1956 1956 1955 1952

SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1952 - 1998
ANNUAL TOTAL 5454.9   6554.3  
ANNUAL MEAN 14.9   18.0   13.7  
HIGHEST ANNUAL MEAN 22.5   1993
LOWEST ANNUAL MEAN 2.96 1953
HIGHEST DAILY MEAN 306          Feb 21 207          Mar 18 753      Aug 14 1987
LOWEST DAILY MEAN 2.9       Sep 13 2.8       Aug 2 .00 A
ANNUAL SEVEN-DAY MINIMUM 3.1       Sep 7 3.0       Jul 12 .00 Oct 27 1956
INSTANTANEOUS PEAK FLOW 374          Jun 25 1190      Aug 14 1987
INSTANTANEOUS PEAK STAGE 5.71     Jun 25 10.10 Aug 14 1987
INSTANTANEOUS LOW FLOW 1.5       B
ANNUAL RUNOFF (CFSM) 1.30 1.56 1.19
ANNUAL RUNOFF (INCHES) 17.65 21.20 16.23
10 PERCENT EXCEEDS 32      43      28     
50 PERCENT EXCEEDS 7.6   8.6   6.0  
90 PERCENT EXCEEDS 3.7   3.6   1.8  
A - At times in several years.
B - July 22, Aug. 1, 2.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data