Station list     Available data
ROCK RIVER BASIN


05439000       SOUTH BRANCH KISHWAUKEE RIVER AT DE KALB, IL



LOCATION.-- Lat 41°55'52", long 88°45'34", 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 1995-2001.
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.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,500 ft3/s, July 2, 1983, gage height, 15.80 ft; present datum; no flow, several days.
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 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 7.1 9.4 18    e8.6 138  176  63  44  96  19      1.3   .28
2 5.4 10    18    e8.6 175  144  59  41  154  17      6.6   .27
3 7.2 12    17    e8.7 80  141  57  38  120  21      1.5   .84
4 44    12    19    e9.0 56  140  60  41  94  17      .86 2.2  
5 46    4.7 18    e9.0 45  101  66  36  178  14      .80 .72
 
6 33    13    18    e9.0 39  82  84  36  264  12      2.3   1.4  
7 24    24    19    e9.4 34  75  82  45  173  12      .59 13     
8 21    18    19    e9.5 51  73  72  37  133  11      .41 1.6  
9 18    68    15    e9.3 636  59  76  33  110  10      .42 8.9  
10 17    131    17    e9.1 766  58  69  36  95  8.9   .45 4.0  
 
11 15    75    12    10    500  70  85  46  84  7.4   .37 1.4  
12 14    56    10    10    311  78  149  34  77  6.3   .35 .86
13 13    48    e9.5 10    227  100  110  31  68  6.0   .29 .61
14 14    39    e9.6 12    225  83  96  32  62  5.5   .28 .52
15 13    34    e9.8 16    222  192  102  33  63  4.9   .31 .50
 
16 13    33    e10    15    171  302  101  31  53  3.4   4.7   .52
17 12    28    e11    13    139  201  89  28  49  2.6   1.1   1.2  
18 12    24    e9.6 13    135  187  79  28  49  3.6   3.0   5.6  
19 12    24    e9.0 13    106  218  76  24  42  3.6   2.1   110     
20 12    23    e9.0 12    129  216  73  24  38  2.9   .84 20     
 
21 11    21    e8.9 11    106  200  78  36  52  2.3   .65 30     
22 11    21    e8.8 9.9 88  174  67  28  54  2.4   .85 8.1  
23 10    18    e8.8 9.6 71  156  66  25  39  2.0   .61 35     
24 11    17    e8.7 9.6 218  135  57  27  34  4.7   .56 18     
25 11    18    e8.3 9.1 992  114  54  24  30  1.7   .92 9.9  
 
26 12    22    e8.1 8.5 593  98  53  33  27  .93 .84 6.1  
27 12    19    e8.3 9.0 372  87  50  46  25  .86 .53 4.6  
28 11    17    e8.6 8.7 238  78  47  40  24  .68 .40 3.8  
29 9.9 18    e8.6 28    ---  72  45  35  22  .49 .30 3.3  
30 9.5 17    e8.6 113    ---  66  43  32  20  2.2   .29 3.3  
 
31 9.6 ---    e8.6 142    ---  66  ---  39  ---  .80 .37 ---     

TOTAL 470.7 874.1 371.8 572.6 6863 3942 2208 1063 2329 207.16 34.89 296.52
MEAN 15.2 29.1 12.0 18.5 245 127 73.6 34.3 77.6 6.68 1.13 9.88
MAX 46 131 19 142 992 302 149 46 264 21 6.6 110
MIN 5.4 4.7 8.1 8.5 34 58 43 24 20 .49 .28 .27
CFSM .20 .37 .15 .24 3.15 1.64 .95 .44 1.00 .09 .01 .13
IN. .23 .42 .18 .27 3.29 1.89 1.06 .51 1.12 .10 .02 .14
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 2001, BY WATER YEAR (WY)
MEAN 24.1 58.6 58.0 43.8 81.4 102 108 92.4 91.0 59.0 36.3 29.8
MAX 119 246 261 154 245 292 309 221 257 322 383 337
(WY) 1927 1986 1983 1993 2001 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 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1926 - 2001
ANNUAL TOTAL 18140.8   19232.77
ANNUAL MEAN 49.6   52.7   65.2      
HIGHEST ANNUAL MEAN 151          1993
LOWEST ANNUAL MEAN 13.4       1931
HIGHEST DAILY MEAN 736          Jun 13 992          Feb 25 2520          Jul 3 1983
LOWEST DAILY MEAN 1.2       Sep 7 .27     Sep 2 .00     A
ANNUAL SEVEN-DAY MINIMUM 1.9       Sep 4 .35     Aug 27 .03     Sep 30 1931
MAXIMUM PEAK FLOW 1080          Feb 25 3500          Jul 2 1983
MAXIMUM PEAK STAGE 8.33     Feb 25 15.80 B Jul 2 1983
INSTANTANEOUS LOW FLOW .25     A
ANNUAL RUNOFF (CFSM) .64 .68 .84    
ANNUAL RUNOFF (INCHES) 8.69 9.21 11.41    
10 PERCENT EXCEEDS 123      135      160         
50 PERCENT EXCEEDS 18      19      28         
90 PERCENT EXCEEDS 3.7   .93 1.9      

A - Several days.
B - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data