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
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
12.936 26   e9.5171 60 45 153 126 49   3.3  .53
26.036 24   e9.0254 63 42 134 620 40   2.2  .50
38.433 24   e8.3234 66 41 120 296 37   1.9  .66
44.330 23   e7.5181 61 44 110 199 33   1.4  .38
518   28 22   e6.6143 60 36 107 156 29   1.3  .34
 
610   26 66   e8.0124 49 40 213 128 27   1.4  .27
78.024 225   e9.1119 56 33 213 114 22   2.0  .21
85.923 145   e9.5108 50 39 155 102 20   1.6  .24
95.025 105   e9.5108 47 60 125 96 26   1.5  .13
103.7178 87   e9.5115 64 43 112 92 21   2.1  .07
 
113.1178 75   e9.5165 53 44 114 144 16   .85.00
122.6113 68   e9.5280 46 35 386 260 14   2.2  .67
132.593 62   e9.5162 45 35 542 704 12   1.7  1.4  
142.081 55   e9.5122 46 36 321 849 11   1.3  .45
153.367 52   e9.5107 54 49 221 358 9.5.93.22
 
162.563 50   e9.698 88 321 173 229 8.2.69.24
17121   51 47   e9.689 222 309 184 174 9.5.35.18
18411   47 45   e9.680 220 192 154 142 7.4.26.16
19240   47 40   e9.673 139 145 126 124 9.2.46.86
20138   41 34   e11   65 112 121 116 111 6.5.43.68
 
21103   37 e27   44   59 98 135 109 100 85   .28.32
2279   37 e25   389   56 82 299 104 102 66   .23.14
2365   36 e23   721   55 74 741 95 100 25   3.4  .03
2454   31 e20   643   51 69 507 89 90 19   30     .00
2547   33 e16   424   50 60 313 81 76 13   8.2  .01
 
2642   30 e15   264   46 57 227 73 68 14   4.6  .03
2742   27 e13   226   60 55 231 69 63 9.03.2  31     
2852   27 e12   286   65 54 331 69 58 7.02.1  157     
2951   28 e11   186   --- 49 246 64 51 5.61.6  88     
3045   33 e10   160   --- 46 184 62 46 5.41.0  44     
 
3138   --- e9.9169   --- 46 --- 70 --- 4.1.78---     

TOTAL1616.215391456.93695.432402291492446645778660.483.26328.72
MEAN52.151.347.011911673.916415019321.32.6911.0
MAX4111782257212802227415428498530157
MIN2.0239.96.646453362464.1.23.00
CFSM.67.66.601.531.49.952.111.942.48.27.03.14
IN..77.74.701.771.551.102.362.232.77.32.04.16

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 1999, BY WATER YEAR (WY)
MEAN25.861.661.546.176.610311195.786.960.338.231.3
MAX119246261154231292309221257322383337
(WY)192719861983199319971993199319951993198319871980
MIN.231.43.935.256.1412.318.611.49.971.52.51.33
(WY)192619981998198219311996199619311930198819311988

SUMMARY STATISTICSFOR 1998 CALENDAR YEARFOR 1999 WATER YEARWATER YEARS 1926 - 1999
ANNUAL TOTAL29266.7930276.88
ANNUAL MEAN80.2  83.0  66.4      
HIGHEST ANNUAL MEAN151         1993
LOWEST ANNUAL MEAN13.4      1931
HIGHEST DAILY MEAN713         May 8849         Jun 142520         Jul 3 1983
LOWEST DAILY MEAN.38    Sep 12.00    Sep 11,24.00    A
ANNUAL SEVEN-DAY MINIMUM1.2      Sep 7.17    Sep 20.03    Sep 30 1931
INSTANTANEOUS PEAK FLOW1080         Jun 133500         Jul 2 1983
INSTANTANEOUS PEAK STAGE8.34    Jun 1315.80 BJul 2 1983
ANNUAL RUNOFF (CFSM)1.031.07.85    
ANNUAL RUNOFF (INCHES)14.0114.5011.61    
10 PERCENT EXCEEDS181     216     163         
50 PERCENT EXCEEDS52     46     29         
90 PERCENT EXCEEDS2.5  1.2  1.9      
A - Aug. 7, Sept. 20, 21, 1988, Aug. 24, 1991, and Sept. 11, 24, 1999.
B - Present datum.


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