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 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 2.9 36  26    e9.5 171  60  45  153  126  49    3.3   .53
2 6.0 36  24    e9.0 254  63  42  134  620  40    2.2   .50
3 8.4 33  24    e8.3 234  66  41  120  296  37    1.9   .66
4 4.3 30  23    e7.5 181  61  44  110  199  33    1.4   .38
5 18    28  22    e6.6 143  60  36  107  156  29    1.3   .34
 
6 10    26  66    e8.0 124  49  40  213  128  27    1.4   .27
7 8.0 24  225    e9.1 119  56  33  213  114  22    2.0   .21
8 5.9 23  145    e9.5 108  50  39  155  102  20    1.6   .24
9 5.0 25  105    e9.5 108  47  60  125  96  26    1.5   .13
10 3.7 178  87    e9.5 115  64  43  112  92  21    2.1   .07
 
11 3.1 178  75    e9.5 165  53  44  114  144  16    .85 .00
12 2.6 113  68    e9.5 280  46  35  386  260  14    2.2   .67
13 2.5 93  62    e9.5 162  45  35  542  704  12    1.7   1.4  
14 2.0 81  55    e9.5 122  46  36  321  849  11    1.3   .45
15 3.3 67  52    e9.5 107  54  49  221  358  9.5 .93 .22
 
16 2.5 63  50    e9.6 98  88  321  173  229  8.2 .69 .24
17 121    51  47    e9.6 89  222  309  184  174  9.5 .35 .18
18 411    47  45    e9.6 80  220  192  154  142  7.4 .26 .16
19 240    47  40    e9.6 73  139  145  126  124  9.2 .46 .86
20 138    41  34    e11    65  112  121  116  111  6.5 .43 .68
 
21 103    37  e27    44    59  98  135  109  100  85    .28 .32
22 79    37  e25    389    56  82  299  104  102  66    .23 .14
23 65    36  e23    721    55  74  741  95  100  25    3.4   .03
24 54    31  e20    643    51  69  507  89  90  19    30      .00
25 47    33  e16    424    50  60  313  81  76  13    8.2   .01
 
26 42    30  e15    264    46  57  227  73  68  14    4.6   .03
27 42    27  e13    226    60  55  231  69  63  9.0 3.2   31     
28 52    27  e12    286    65  54  331  69  58  7.0 2.1   157     
29 51    28  e11    186    ---  49  246  64  51  5.6 1.6   88     
30 45    33  e10    160    ---  46  184  62  46  5.4 1.0   44     
 
31 38    ---  e9.9 169    ---  46  ---  70  ---  4.1 .78 ---     

TOTAL 1616.2 1539 1456.9 3695.4 3240 2291 4924 4664 5778 660.4 83.26 328.72
MEAN 52.1 51.3 47.0 119 116 73.9 164 150 193 21.3 2.69 11.0
MAX 411 178 225 721 280 222 741 542 849 85 30 157
MIN 2.0 23 9.9 6.6 46 45 33 62 46 4.1 .23 .00
CFSM .67 .66 .60 1.53 1.49 .95 2.11 1.94 2.48 .27 .03 .14
IN. .77 .74 .70 1.77 1.55 1.10 2.36 2.23 2.77 .32 .04 .16

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 1999, BY WATER YEAR (WY)
MEAN 25.8 61.6 61.5 46.1 76.6 103 111 95.7 86.9 60.3 38.2 31.3
MAX 119 246 261 154 231 292 309 221 257 322 383 337
(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 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1926 - 1999
ANNUAL TOTAL 29266.79 30276.88
ANNUAL MEAN 80.2   83.0   66.4      
HIGHEST ANNUAL MEAN 151          1993
LOWEST ANNUAL MEAN 13.4       1931
HIGHEST DAILY MEAN 713          May 8 849          Jun 14 2520          Jul 3 1983
LOWEST DAILY MEAN .38     Sep 12 .00     Sep 11,24 .00     A
ANNUAL SEVEN-DAY MINIMUM 1.2       Sep 7 .17     Sep 20 .03     Sep 30 1931
INSTANTANEOUS PEAK FLOW 1080          Jun 13 3500          Jul 2 1983
INSTANTANEOUS PEAK STAGE 8.34     Jun 13 15.80 B Jul 2 1983
ANNUAL RUNOFF (CFSM) 1.03 1.07 .85    
ANNUAL RUNOFF (INCHES) 14.01 14.50 11.61    
10 PERCENT EXCEEDS 181      216      163         
50 PERCENT EXCEEDS 52      46      29         
90 PERCENT EXCEEDS 2.5   1.2   1.9      
A - Aug. 7, Sept. 20, 21, 1988, Aug. 24, 1991, and Sept. 11, 24, 1999.
B - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data