Station list     Available data
ROCK RIVER BASIN


05448000       MILL CREEK AT MILAN, IL

 

LOCATION.-- Lat 41°26'32", long 90°33'21" (NAD of 1927), in NW1/4NE1/4 sec.25, T.17 N., R.2 W., Rock Island County, Hydrologic Unit 07090005, on right bank 100 ft. upstream from Knoxville Road Bridge, 1 mi southeast of Milan, and at mile 1.2.
 

DRAINAGE AREA.-- 62.4 mi2.
 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: March 1989 to current year. October 1939 to September 1940 (fragmentary), July 1941 to September 1986. Seven-month period (March to September), water years 1987-89.
 

STAGE: Water years 1999 to current year.
 

REVISED RECORDS.-- WSP 1308: 1940(M), 1943(M). WDR IL-72-1: Drainage area.
 

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 565.23 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1987, at datum 1.00 ft higher. Prior to Apr. 5, 1940, nonrecording gage at site 300 ft upstream. Oct. 1939 to Nov. 15, 1984, recording gage at site 400 ft. upstream.
 

REMARKS.-- Occasional pumpage of about 3-6 ft3/s from quarry into creek upstream from gage.
 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,300 ft3/s, Apr. 22, 1973, gage height, 12.65 ft, present datum; no flow at times in several years.
 

REMARKS FOR CURRENT YEAR.-- Records good except those for May 31 to June 16, which are fair, and estimated daily discharges, which are poor.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 0.89 3.4 6.7 9.2 e9.4 30  71  27  327  35  10    22   
2 0.54 6.2 7.6 11    e9.3 26  61  34  247  29  9.5 18   
3 0.55 32    5.0 12    e10    22  56  63  224  37  11    19   
4 0.61 16    4.9 7.4 e11    33  49  41  179  34  43    19   
5 0.64 8.1 5.7 9.5 e12    229  45  35  155  29  18    16   
 
6 2.1   6.4 6.2 14    e13    101  43  32  133  55  11    10   
7 2.6   5.6 6.3 5.0 e14    70  40  368  119  36  9.6 9.3
8 2.8   4.9 7.0 7.5 e13    53  39  181  107  31  8.9 8.7
9 2.8   4.7 10    e10    e12    46  36  117  99  32  8.5 8.4
10 2.2   5.1 208    e9.6 e12    39  34  93  240  35  10    8.2
 
11 1.00 5.0 67    e9.2 e11    35  30  77  415  33  11    7.7
12 1.6   5.0 34    e8.8 e11    29  29  63  183  27  9.4 7.3
13 2.0   5.2 e30    e8.4 e10    29  28  73  141  23  7.1 6.8
14 3.8   5.0 e26    e8.2 e10    32  27  76  184  20  6.7 6.6
15 5.5   5.1 23    e8.0 e9.7 28  28  68  131  18  6.5 18   
 
16 5.2   5.4 20    e7.9 e9.3 32  27  59  105  30  6.2 74   
17 4.3   7.3 15    e7.8 e9.0 31  26  55  94  53  8.5 24   
18 3.1   13    e15    e10    e11    43  23  252  85  25  21    13   
19 2.6   13    e14    e8.8 e13    40  22  177  76  21  101    9.2
20 2.6   10    14    7.5 e30    39  27  120  69  19  22    7.9
 
21 3.0   7.6 17    e7.4 e90    33  55  171  71  18  15    7.4
22 3.0   6.1 17    e7.3 e70    31  33  336  68  28  10    6.7
23 3.1   6.6 16    e7.2 e80    31  28  196  54  38  9.3 6.5
24 3.0   7.4 e12    e7.1 e60    34  28  128  50  21  15    6.1
25 3.4   6.8 9.1 e7.0 e45    33  36  158  47  19  30    6.0
 
26 3.7   6.1 10    e11    e36    170  29  113  43  16  55    6.1
27 3.8   6.1 11    e11    e32    131  26  96  40  18  26    8.9
28 4.5   5.9 15    e10    e31    105  28  82  42  19  119    8.9
29 5.6   5.5 13    e10    30    105  27  70  36  17  95    6.6
30 5.4   5.6 10    e9.8 ---    87  28  2600  37  14  41    5.4
 
31 4.4   ---    10    e9.6 ---    82  ---  559  ---  11  29    ---   

TOTAL 90.33 230.1 665.5 277.2 713.7 1829 1059 6520 3801 841 783.2 381.7
MEAN 2.91 7.67 21.5 8.94 24.6 59.0 35.3 210 127 27.1 25.3 12.7
MAX 5.6 32 208 14 90 229 71 2600 415 55 119 74
MIN 0.54 3.4 4.9 5.0 9.0 22 22 27 36 11 6.2 5.4
CFSM 0.05 0.12 0.34 0.14 0.39 0.95 0.57 3.37 2.03 0.43 0.40 0.20
IN. 0.05 0.14 0.40 0.17 0.43 1.09 0.63 3.89 2.27 0.50 0.47 0.23
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2004, BY WATER YEAR (WY)
MEAN 22.1 23.5 26.1 37.0 62.5 75.8 78.0 78.2 70.7 41.0 24.6 18.5
MAX 209 175 162 223 261 299 335 432 616 388 259 208
(WY) 1955 1962 1983 1960 2001 1960 1965 1996 1993 1986 1993 1970
MIN 0.11 0.51 0.44 0.00 2.78 3.95 3.17 3.44 1.86 1.50 0.89 0.18
(WY) 1957 1957 1977 1940 1964 1956 1956 1956 1956 1988 1957 1956

SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1940 - 2004
ANNUAL TOTAL 8635.07   17191.73  
ANNUAL MEAN 23.7     47.0     47.8        
HIGHEST ANNUAL MEAN 173            1993
LOWEST ANNUAL MEAN 8.67       1957
HIGHEST DAILY MEAN 572            May 5 2600            May 30 5000            Jul 8 1986
LOWEST DAILY MEAN 0.37       Sep 11 0.54       Oct 2 0.00       A
ANNUAL SEVEN-DAY MINIMUM 0.68       Sep 6 1.1         Oct 1 0.00       A
MAXIMUM PEAK FLOW 6650            May 30 9300            Apr 22 1973
MAXIMUM PEAK STAGE 10.23       May 30 12.65   B Apr 22 1973
INSTANTANEOUS LOW FLOW 0.38       Oct 2
ANNUAL RUNOFF (CFSM) 0.379 0.753 0.766    
ANNUAL RUNOFF (INCHES) 5.15   10.25   10.41      
10 PERCENT EXCEEDS 44        102        96           
50 PERCENT EXCEEDS 7.9     18        18           
90 PERCENT EXCEEDS 2.0     5.1     1.8        

A - At times in several years.

B - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data