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.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: August 1952 to current year.
 

STAGE: Water years 1994-2001.

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

REMARKS.-- Effluent from sewage-treatment plant 1.7 mi upstream.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,190 ft3/s, Aug. 14, 1987, gage height, 10.10 ft; no flow at times in several years.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from sewage - treatment plant averaged about 3.5 ft3/s.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.1 2.0 8.2 6.5 28    20    11    e8.0 28    e3.8 3.8 4.7
2 2.9 3.8 7.0 6.4 21    16    8.4 e7.6 39    e3.7 80    4.1
3 3.5 2.4 6.1 6.5 17    14    7.6 e6.6 28    e3.5 20    5.2
4 47    1.8 5.9 6.4 11    14    7.3 e5.0 19    e3.4 11    5.1
5 16    1.6 5.0 7.0 9.4 13    15    e6.8 28    3.2 7.6 4.2
 
6 14    13    4.4 7.5 9.0 10    19    e8.1 33    3.4 5.8 22   
7 6.4 39    e4.3 7.8 9.5 10    13    e7.8 24    31    4.9 14   
8 5.7 11    e4.2 8.1 64    7.5 9.7 e7.0 22    8.7 4.7 6.0
9 4.2 84    e4.1 7.4 207    7.3 17    22    18    5.7 27    13   
10 3.4 42    4.2 7.2 83    7.0 12    28    14    4.5 27    9.0
 
11 3.0 16    e4.5 7.7 32    9.5 26    142    13    3.7 9.6 5.9
12 2.9 11    e5.0 8.2 26    13    41    41    88    3.4 6.2 4.7
13 2.8 19    5.3 11    43    14    19    19    37    3.1 5.4 4.1
14 2.7 11    e5.4 21    58    12    14    19    23    2.8 4.3 3.8
15 2.7 8.2 e5.5 40    44    46    16    32    20    2.7 3.9 3.6
 
16 3.1 7.9 e5.6 28    17    54    11    34    15    3.1 32    3.6
17 2.7 6.9 e5.7 21    13    45    9.5 28    11    40    9.9 4.9
18 2.5 5.8 5.7 17    9.4 39    8.8 15    10    12    7.8 6.4
19 3.0 5.8 6.3 15    8.3 37    9.2 13    9.7 7.3 50    e337   
20 3.2 5.5 6.7 12    9.0 37    20    11    8.0 5.8 18    e74   
 
21 3.2 4.3 6.0 12    12    39    26    10    7.6 4.6 11    87   
22 3.0 4.2 e6.2 11    9.3 33    28    9.1 8.1 17    66    27   
23 3.6 4.0 e6.0 9.0 10    26    67    8.0 8.0 14    118    65   
24 9.5 4.0 5.7 8.5 67    19    34    7.4 e7.5 11    25    36   
25 2.9 5.5 e4.8 7.9 101    14    18    7.5 e6.2 13    43    27   
 
26 2.8 14    4.6 9.0 35    11    14    8.0 e5.6 6.4 48    44   
27 3.3 8.2 4.8 7.1 25    9.5 12    35    e5.0 5.1 17    36   
28 2.4 6.6 4.8 6.5 25    8.5 11    34    e4.7 4.5 12    29   
29 2.1 8.0 4.9 37    ---    8.4 e10    32    e4.4 4.0 8.3 27   
30 2.1 7.5 6.0 88    ---    7.9 e9.0 21    e4.0 4.1 12    26   
 
31 2.0 ---    6.8 46    ---    9.8 ---    16    ---    4.2 9.1 ---   

TOTAL 171.7 364.0 169.7 493.7 1002.9 611.4 523.5 648.9 548.8 242.7 708.3 939.3
MEAN 5.54 12.1 5.47 15.9 35.8 19.7 17.5 20.9 18.3 7.83 22.8 31.3
MAX 47 84 8.2 88 207 54 67 142 88 40 118 337
MIN 2.0 1.6 4.1 6.4 8.3 7.0 7.3 5.0 4.0 2.7 3.8 3.6
CFSM .48 1.06 .48 1.38 3.11 1.72 1.52 1.82 1.59 .68 1.99 2.72
IN. .56 1.18 .55 1.60 3.24 1.98 1.69 2.10 1.78 .79 2.29 3.04
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 2001, BY WATER YEAR (WY)
MEAN 8.28 11.1 11.9 10.1 14.5 23.0 25.5 16.0 14.4 11.3 10.9 10.4
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 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1952 - 2001
ANNUAL TOTAL 5723.5   6424.9      
ANNUAL MEAN 15.6   17.6       14.0  
HIGHEST ANNUAL MEAN 22.5   1993
LOWEST ANNUAL MEAN 2.96 1953
HIGHEST DAILY MEAN 217          Apr 20 337      A     Sep 19 753      Aug 14 1987
LOWEST DAILY MEAN 1.0       Jul 23, 24 1.6           Nov 5 .00 B
ANNUAL SEVEN-DAY MINIMUM 1.6       Aug 21 2.2           Oct 30 .00 Oct 27 1956
MAXIMUM PEAK FLOW 624              Sep 19 1190      Aug 14 1987
MAXIMUM PEAK STAGE 7.64         Sep 19 10.10 Aug 14 1987
INSTANTANEOUS LOW FLOW .72         Nov 5,6
ANNUAL RUNOFF (CFSM) 1.36 1.53     1.21
ANNUAL RUNOFF (INCHES) 18.51 20.78     16.48
10 PERCENT EXCEEDS 39      39          29     
50 PERCENT EXCEEDS 5.9   9.0       6.1  
90 PERCENT EXCEEDS 2.3   3.6       1.8  

A- Estimated.
B- At times in several years.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data