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

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) (565.01 ft NAVD 1988). 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.
 

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of June 1936 reached a stage of 7.4 ft, from information by local residents, and an estimated discharge of 4,500 ft3/s.
 

REMARKS FOR CURRENT YEAR.-- Records good except those for Dec. 7-8, 20, Feb. 7-28, Mar. 25-31, Aug. 6-9, 11, 22, 25, 29, 30, Sept. 4, 7-9, 13-15, 20, 22-24, 30, and estimated daily discharges, which are poor.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2004 TO SEPTEMBER 2005
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 5.9 213  105  51  e47  41  60  27  15    8.5 1.8   e0.90
2 8.1 278  97  76  e49  39  53  30  16    7.3 3.8   e1.5  
3 7.1 191  95  193  e52  37  51  28  17    7.3 3.1   e2.6  
4 5.5 188  91  164  e58  38  48  24  16    7.6 1.2   4.4  
5 5.3 162  84  82  e65  38  45  24  21    7.7 0.94 4.6  
 
6 5.2 145  153  68  78  36  44  23  14    7.2 0.71 1.7  
7 5.7 127  177  e62  126  39  41  23  12    7.7 0.65 2.3  
8 72    108  155  e56  90  34  38  22  18    7.5 0.54 1.8  
9 36    102  137  e52  68  31  37  32  22    6.4 0.51 0.52
10 17    96  122  e48  53  32  37  23  14    6.0 e1.2   e0.50
 
11 15    88  114  46  53  33  37  33  12    5.7 2.2   e0.48
12 16    79  107  67  56  31  85  25  11    5.7 4.8   e2.0  
13 16    73  97  243  104  27  81  46  11    6.2 5.3   4.9  
14 13    70  84  255  247  29  64  49  10    6.0 2.2   2.2  
15 11    65  88  e220  153  29  59  34  10    4.9 1.3   2.4  
 
16 10    64  86  e190  103  30  52  30  10    4.3 0.99 2.3  
17 9.4 62  76  e160  76  27  48  28  9.8 3.8 0.83 1.4  
18 9.7 60  76  e130  75  25  45  25  9.5 3.3 0.75 0.92
19 13    84  43  e110  62  26  42  35  9.4 2.8 2.4   2.3  
20 12    72  105  e100  72  24  39  28  9.4 5.8 5.9   0.88
 
21 11    60  e54  e90  72  23  38  26  9.2 7.1 3.6   e0.60
22 17    61  e47  e80  53  23  43  25  8.9 3.3 0.75 4.6  
23 152    64  e44  e75  47  30  39  22  8.7 2.5 e0.60 4.2  
24 79    59  e42  e70  48  35  34  21  8.5 2.4 e0.85 0.94
25 51    52  e39  e66  52  131  34  20  8.3 2.1 1.1   0.90
 
26 433    51  e37  e62  47  121  34  22  8.1 5.6 1.3   2.6  
27 310    129  e36  e58  54  99  32  20  8.0 8.3 1.3   1.7  
28 181    155  e37  e54  53  85  29  17  7.7 4.2 1.2   2.8  
29 178    117  e38  e50  ---  74  29  17  8.7 2.5 0.98 2.9  
30 205    114  e40  e48  ---  65  28  18  9.4 2.1 0.51 2.2  
 
31 145    ---  e42  e46  ---  75  ---  16  ---    1.9 e0.47 ---     

TOTAL 2054.9 3189 2548 3072 2113 1407 1346 813 352.6 163.7 53.78 64.04
MEAN 66.3 106 82.2 99.1 75.5 45.4 44.9 26.2 11.8 5.28 1.73 2.13
MAX 433 278 177 255 247 131 85 49 22 8.5 5.9 4.9
MIN 5.2 51 36 46 47 23 28 16 7.7 1.9 0.47 0.48
CFSM 1.06 1.70 1.32 1.59 1.21 0.73 0.72 0.42 0.19 0.08 0.03 0.03
IN. 1.23 1.90 1.52 1.83 1.26 0.84 0.80 0.48 0.21 0.10 0.03 0.04
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2005, BY WATER YEAR (WY)
MEAN 22.8 24.8 27.0 38.0 62.7 75.3 77.5 77.4 69.8 40.4 24.3 18.2
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 2004 CALENDAR YEAR FOR 2005 WATER YEAR WATER YEARS 1940 - 2005
ANNUAL TOTAL 23997.7   17177.02      
ANNUAL MEAN 65.6   47.1         47.8        
HIGHEST ANNUAL MEAN 173            1993
LOWEST ANNUAL MEAN 8.67       1957
HIGHEST DAILY MEAN 2600          May 30 433                Oct 26 5000            Jul 8 1986
LOWEST DAILY MEAN 5.0       Jan 7 0.47   A     Aug 31 0.00       B
ANNUAL SEVEN-DAY MINIMUM 6.1       Sep 30 0.82           Aug 4 0.00       B
MAXIMUM PEAK FLOW 919                Oct 26 9300            Apr 22 1973
MAXIMUM PEAK STAGE 5.03           Oct 26 12.65   C Apr 22 1973
INSTANTANEOUS LOW FLOW 0.13           Sep 6
ANNUAL RUNOFF (CFSM) 1.05 0.754     0.766    
ANNUAL RUNOFF (INCHES) 14.31 10.24       10.41      
10 PERCENT EXCEEDS 147      114            96           
50 PERCENT EXCEEDS 33      31            18           
90 PERCENT EXCEEDS 8.2   1.9         1.8        

A - Estimated.

B - At times in several years.

C - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data