Station list     Available data
ROCK RIVER BASIN


05439000                   SOUTH BRANCH KISHWAUKEE RIVER AT DE KALB, IL



LOCATION.--Lat 41°55'53", long 88°45'35", in SW1/4NE1/4 sec.22, T.40 N., R.4 E., De Kalb County, Hydrologic Unit 07090006, on left bank 100 ft downstream from bridge on State Highway 38 in De Kalb, and at mile 48.5.

DRAINAGE AREA.--77.7 mi2.

PERIOD OF RECORD.--July 1925 to October 1933, October 1979 to current year.

REVISED RECORDS.--WDR IL-80-1: Drainage area.

GAGE.--Water-stage recorder. Datum of gage is 831.88 ft above sea level. Mar. 23, 1980, to Sept. 30, 1983, at datum 3.0 ft higher. Oct. 1, 1979, to Mar. 22, 1980, nonrecording gage at same site at datum 3.0 ft higher. Prior to Sept. 30, 1933, nonrecording gage at same site at datum 3.40 ft higher.

REMARKS.--Records good except those for estimated daily discharges, which are poor. 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 .59 2.1   2.0   .92 30  103  288  e119  52  36    3.6 2.3  
2 .37 3.1   1.2   1.8   43  90  226  e129  53  32    3.0 1.6  
3 .31 2.3   1.3   39      49  84  183  e120  47  59    2.3 5.2  
4 .77 2.2   1.2   e92      55  76  153  e110  45  166    32    2.4  
5 .32 3.3   .96 e115      54  67  132  e118  45  91    22    1.6  
 
6 .22 7.8   .86 167      49  64  119  e180  43  67    17    1.1  
7 .20 2.6   .60 e230      52  60  119  350  40  164    18    2.6  
8 .39 1.2   .47 177      65  151  170  713  38  158    11    1.4  
9 1.3   .51 .51 138      63  223  286  498  115  98    7.3 1.2  
10 .27 .90 1.0   111      59  179  253  333  248  70    5.4 1.7  
 
11 .16 .43 1.4   113      172  124  190  252  299  54    4.1 .55
12 .11 .36 1.0   79      290  103  160  203  413  45    3.4 .38
13 e5.0   .25 .68 76      199  97  146  173  269  39    2.5 .69
14 2.4   .21 .57 e68      151  86  129  151  200  34    1.6 17     
15 1.3   .48 .45 60      127  76  149  138  161  30    1.7 15     
 
16 .88 .89 .46 51      113  73  548  124  131  27    1.8 7.5  
17 2.4   .64 .41 45      105  96  394  108  109  22    1.4 4.6  
18 .51 .55 .41 e42      97  303  274  103  105  20    1.3 3.4  
19 1.2   .52 .38 e36      86  319  214  128  130  34    1.6 2.1  
20 1.6   .51 .49 e31      81  234  207  109  103  21    1.6 1.8  
 
21 .37 .57 .47 e28      73  178  364  98  87  18    1.1 1.9  
22 .28 .67 .54 e23      69  149  315  92  76  19    1.2 2.1  
23 .25 .59 .70 e22      66  128  237  85  69  16    1.4 1.2  
24 1.2   e.56 .95 e21      67  111  191  83  65  15    4.7 1.0  
25 .62 e.50 2.6   e21      61  104  164  76  58  12    36    .95
 
26 6.0   .73 1.7   e20      69  99  155  72  51  9.3 6.6 1.5  
27 8.8   1.1   1.4   e19      126  91  157  69  47  8.3 3.2 1.6  
28 5.7   1.1   1.0   e19      126  93  141  65  54  8.0 17    1.3  
29 3.6   3.1   1.0   e18      ---  84  133  66  43  6.9 6.7 3.2  
30 2.4   3.1   1.1   e18      ---  82  121  60  41  5.1 3.8 5.2  
 
31 2.4   ---      .97 e19      ---  180  ---  60  ---  4.2 2.8 ---     

TOTAL 51.92 42.87 28.78 1900.72 2597 3907 6318 4985 3237 1388.8 227.1 94.07
MEAN 1.67 1.43 .93 61.3 92.8 126 211 161 108 44.8 7.33 3.14
MAX 8.8 7.8 2.6 230 290 319 548 713 413 166 36 17
MIN .11 .21 .38 .92 30 60 119 60 38 4.2 1.1 .38
CFSM .02 .02 .01 .79 1.19 1.62 2.71 2.07 1.39 .58 .09 .04
IN. .02 .02 .01 .91 1.24 1.87 3.02 2.39 1.55 .66 .11 .05

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 1998, BY WATER YEAR (WY)
MEAN 24.8 61.9 62.0 43.4 75.1 104 109 93.7 83.0 61.7 39.5 32.0
MAX 119 247 261 154 231 292 309 221 257 322 383 337
(WY) 1927 1986 1983 1993 1997 1993 1993 1995 1993 1983 1987 1980
MIN .23 1.43 .93 5.25 6.14 12.3 18.6 11.4 9.97 1.52 .51 .33
(WY) 1926 1998 1998 1982 1931 1996 1996 1931 1930 1988 1931 1988

SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1926 - 1998
ANNUAL TOTAL 17309.55 24778.26
ANNUAL MEAN 47.4   67.9   65.8      
HIGHEST ANNUAL MEAN 151          1993
LOWEST ANNUAL MEAN 13.4       1931
HIGHEST DAILY MEAN 1580          Feb 21 713          May 8 2520          Jul 3 1983
LOWEST DAILY MEAN .11     Oct 12 .11     Oct 12 .00     A
ANNUAL SEVEN-DAY MINIMUM .20     Jul 30 .37     Oct 2 .03     Sep 30 1931
INSTANTANEOUS PEAK FLOW 750          May 8 3500          Jul 2 1983
INSTANTANEOUS PEAK STAGE 7.78     May 8 15.80 B Jul 2 1983
INSTANTANEOUS LOW FLOW .10     Oct 11,12
ANNUAL RUNOFF (CFSM) .61 .87 .85    
ANNUAL RUNOFF (INCHES) 8.29 11.86 11.50    
10 PERCENT EXCEEDS 87      178      161         
50 PERCENT EXCEEDS 18      32      28         
90 PERCENT EXCEEDS .30 .57 1.9      
A - Aug. 7, Sept. 20, 21, 1988; Aug. 24, 1991.
B - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data