Station list     Available data
ROCK RIVER BASIN


05448000                         MILL CREEK AT MILAN, IL



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

DRAINAGE AREA.--62.4 mi2.

PERIOD OF RECORD.--October 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.

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

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 565.23 ft above sea level (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.--Records good except those for Oct. 18-27, Nov. 11-12, Dec. 6-27, Jan. 2-8, 18-22, Mar. 17-Apr. 6, Apr. 15-May 9, and May 24-June 8, which are fair, and those for estimated daily discharges, which are poor. Occasional pumpage of about 1 ft3/s from quarry into creek upstream from gage.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 13  87  58  e52  e160  44  50  109  69  77    8.1 3.0
2 18  202  56  e62  e250  50  49  100  156  49    5.8 6.1
3 40  185  55  e58  e210  51  190  93  91  41    5.4 4.6
4 28  133  54  e56  e170  47  e140  94  270  37    5.2 3.5
5 205  114  54  e54  e140  50  e94  90  211  34    4.5 2.8
 
6 104  101  143  e66  e125  51  86  83  371  34    5.4 2.6
7 70  92  253  e60  e115  42  e78  80  308  33    6.5 2.5
8 55  93  149  e57  e105  39  e150  73  132  31    8.4 2.7
9 47  101  125  e54  e98  e43  e140  66  97  29    5.8 2.4
10 41  1300  109  e51  e92  e49  e110  e59  87  26    5.5 4.3
 
11 37  271  100  e48  e130  47  e88  e55  94  24    3.8 2.3
12 35  190  96  e46  e110  49  e79  e70  126  23    32    2.4
13 31  159  90  e45  e96  49  e76  e420  352  24    19    5.2
14 31  142  86  e43  e83  47  e74  e250  152  21    8.4 2.5
15 41  122  83  e42  e74  52  e300  e170  107  19    8.0 2.2
 
16 33  116  82  e41  e67  82  609  e140  90  18    5.0 3.6
17 1460  102  78  e41  e60  144  287  e120  81  17    4.5 2.1
18 2270  93  82  e40  e55  109  204  e105  72  17    5.1 2.0
19 313  87  75  e40  e51  85  170  e95  63  16    8.5 2.2
20 222  82  66  e40  e48  80  144  e90  59  22    6.9 2.1
 
21 179  77  58  e70  e47  72  130  e100  55  17    4.0 2.0
22 149  77  e52  e150  e46  65  130  e140  51  14    3.8 1.9
23 133  74  e60  e340  e46  65  435  e96  55  14    41    3.1
24 120  66  e65  e290  e45  63  207  e76  57  16    57    3.7
25 107  67  e69  e240  43  59  163  65  51  12    15    1.9
 
26 100  63  e70  e170  45  56  143  63  47  14    8.4 2.2
27 113  61  e69  e240  59  57  151  58  45  13    6.6 9.3
28 127  59  e66  e300  50  61  173  55  46  13    5.7 187   
29 98  59  e56  e200  ---  57  137  53  42  12    4.7 45   
30 105  71  e35  e160  ---  52  118  53  42  8.9 3.7 15   
 
31 86  ---  e43  e150  ---  51  ---  50  ---  7.5 3.4 ---   

TOTAL 6411 4446 2537 3306 2620 1868 4905 3171 3479 733.4 315.1 332.2
MEAN 207 148 81.8 107 93.6 60.3 164 102 116 23.7 10.2 11.1
MAX 2270 1300 253 340 250 144 609 420 371 77 57 187
MIN 13 59 35 40 43 39 49 50 42 7.5 3.4 1.9
CFSM 3.31 2.38 1.31 1.71 1.50 .97 2.62 1.64 1.86 .38 .16 .18
IN. 3.82 2.65 1.51 1.97 1.56 1.11 2.92 1.89 2.07 .44 .19 .20

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1999, BY WATER YEAR (WY)
MEAN 23.1 24.7 27.3 39.3 61.2 76.9 78.4 72.2 67.8 40.9 25.1 19.3
MAX 209 175 162 223 223 299 335 432 616 388 259 208
(WY) 1955 1962 1983 1960 1959 1960 1965 1996 1993 1986 1993 1970
MIN .11 .51 .44 .000 2.78 3.95 3.17 3.44 1.86 1.50 .89 .18
(WY) 1957 1957 1977 1940 1964 1956 1956 1956 1956 1988 1957 1956

SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1940 - 1999
ANNUAL TOTAL 40208.3   34123.7  
ANNUAL MEAN 110      93.5   47.8      
HIGHEST ANNUAL MEAN 173          1993
LOWEST ANNUAL MEAN 8.67     1957
HIGHEST DAILY MEAN 2270          Oct 18 2270          Oct 18 5000          Jul 8 1986
LOWEST DAILY MEAN 5.5       Sep 12 1.9       Sep 22,25 .00     A
ANNUAL SEVEN-DAY MINIMUM 6.7       Sep 7 2.2       Sep 17 .00     Dec 30 1939
INSTANTANEOUS PEAK FLOW 5760          Oct 18 9300          Apr 22 1973
INSTANTANEOUS PEAK STAGE 9.69     Oct 18 12.65 B Apr 22 1973
INSTANTANEOUS LOW FLOW 1.4       Sep 24
ANNUAL RUNOFF (CFSM) 1.77 1.50 .77    
ANNUAL RUNOFF (INCHES) 23.97 20.34 10.41    
10 PERCENT EXCEEDS 204      171      92         
50 PERCENT EXCEEDS 75      59      17         
90 PERCENT EXCEEDS 17      5.3   1.6      
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