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.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1925 to October 1933, October 1979 to current year.
 

STAGE: Water years 1995-2000.
SURFACE-WATER QUALITY
 

SEDIMENT: October 1979 to September 1981.

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

GAGE.-- Water-stage recorder, phone telemeter, and crest stage gage. 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.

EXTREMES FOR PERIOD OF RECORD.--
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,650 mg/L June 13, 1981; minimum daily mean, 10 mg/L Mar. 9, 1980.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,070 tons June 13, 1981; minimum daily, 0.04 ton Oct. 15, 1979.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 25    4.2 2.4 e3.2 e4.0 86  17  52  307  78    51    2.0
2 17    4.6 2.6 e3.2 e3.8 68  17  45  259  84    31    1.8
3 19    4.7 3.9 e3.5 e3.6 63  17  40  151  269    18    2.3
4 24    4.5 5.5 e4.8 e3.5 59  16  38  112  176    12    2.3
5 19    4.1 30    e4.2 e3.5 52  15  35  113  127    30    2.3
 
6 16    4.1 15    e3.7 e3.4 46  16  34  93  98    43    1.8
7 12    3.5 10    e3.4 e3.4 43  17  34  78  79    81    1.2
8 11    3.8 8.5 e3.7 e3.3 42  19  36  68  68    54    1.7
9 8.6 3.9 7.7 e4.3 e3.5 42  21  56  59  62    32    1.9
10 7.7 3.6 7.4 e6.0 e3.7 34  22  142  53  249    21    1.9
 
11 7.4 8.0 6.5 e5.4 e3.7 33  19  162  87  256    15    18   
12 6.7 4.7 6.6 e4.8 e3.5 32  16  177  669  144    11    27   
13 6.3 3.8 6.0 e4.4 e3.7 31  15  110  736  104    10    7.5
14 8.9 3.2 6.3 e4.3 e3.6 30  15  82  700  83    9.1 12   
15 8.3 3.3 7.7 e4.3 e3.5 30  16  68  567  66    7.3 5.6
 
16 7.4 3.6 6.9 e4.3 e3.6 27  19  63  345  55    5.8 6.3
17 5.8 3.3 5.6 e4.3 e3.5 23  25  55  238  48    17    2.2
18 5.5 3.4 5.1 e4.2 e3.5 23  20  53  185  39    10    1.9
19 6.0 4.0 5.1 e4.1 e3.5 28  105  51  151  35    7.5 2.0
20 4.8 3.5 5.6 e3.8 e4.0 33  371  43  142  31    5.6 5.8
 
21 4.9 2.9 5.5 e4.0 e6.0 24  400  39  121  27    4.8 3.8
22 5.6 3.0 4.0 e4.2 21    22  243  43  102  23    4.2 30   
23 6.1 4.1 e3.6 e4.3 156    21  169  37  100  19    3.9 22   
24 4.7 4.2 e3.3 e4.2 400    25  129  33  178  17    3.8 20   
25 4.3 3.2 e3.2 e4.0 345    24  103  28  308  15    4.5 16   
 
26 4.0 3.5 e3.4 e3.9 224    21  88  26  205  13    4.2 12   
27 3.7 3.7 e3.3 e3.7 158    24  78  29  148  12    2.8 10   
28 3.8 3.1 e3.2 e3.6 118    22  67  29  120  10    3.0 8.4
29 4.7 2.8 e3.1 e3.7 101    18  59  24  105  9.8 3.9 6.7
30 4.9 2.4 e3.1 e3.8 ---    16  51  25  90  9.8 3.6 6.0
 
31 4.8 ---    e3.2 e3.9 ---    15  ---  83  ---  31    2.2 ---   

TOTAL 277.9 114.7 193.3 127.2 1600.8 1057 2185 1772 6590 2337.6 512.2 242.4
MEAN 8.96 3.82 6.24 4.10 55.2 34.1 72.8 57.2 220 75.4 16.5 8.08
MAX 25 8.0 30 6.0 400 86 400 177 736 269 81 30
MIN 3.7 2.4 2.4 3.2 3.3 15 15 24 53 9.8 2.2 1.2
CFSM .12 .05 .08 .05 .71 .44 .94 .74 2.83 .97 .21 .10
IN. .13 .05 .09 .06 .77 .51 1.05 .85 3.16 1.12 .25 .12

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 2000, BY WATER YEAR (WY)
MEAN 24.4 59.6 59.6 44.7 75.8 101 110 94.4 91.5 60.8 37.5 30.5
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 .22 1.43 .93 4.10 6.14 12.3 18.6 11.4 9.97 1.52 .51 .33
(WY) 1934 1998 1998 2000 1931 1996 1996 1931 1930 1988 1931 1988

SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1926 - 2000
ANNUAL TOTAL 26250.68 17010.1  
ANNUAL MEAN 71.9   46.5   65.7      
HIGHEST ANNUAL MEAN 151          1993
LOWEST ANNUAL MEAN 13.4       1931
HIGHEST DAILY MEAN 849          Jun 14 736          Jun 13 2520          Jul 3 1983
LOWEST DAILY MEAN .00     Sep 11,24 1.2       Sep 7 .00     A
ANNUAL SEVEN-DAY MINIMUM .17     Sep 20 1.9       Sep 4 .03     Sep 30 1931
INSTANTANEOUS PEAK FLOW 818          Jun 12 3500          Jul 2 1983
INSTANTANEOUS PEAK STAGE 7.51     Jun 12 15.80 B Jul 2 1983
INSTANTANEOUS LOW FLOW 1.1       Sep 7
ANNUAL RUNOFF (CFSM) .93 .60 .85    
ANNUAL RUNOFF (INCHES) 12.57 8.14 11.49    
10 PERCENT EXCEEDS 195      120      161         
50 PERCENT EXCEEDS 19      12      28         
90 PERCENT EXCEEDS 1.2   3.3   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