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.--
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 1999-2001.

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 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.-- Occasional pumpage of about 1 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 Jan. 23 to Mar. 28 and May 12 to June 9, which are fair, and those for estimated daily disharges, 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 9.8 14  e9.7 e8.6 e110  134  53  60  297  34  14    3.0
2 9.6 13  e9.4 e8.8 e90  121  49  56  207  32  19    2.9
3 13    12  e9.2 e8.9 e80  e110  47  51  163  35  19    2.8
4 184    11  e9.0 e9.0 e68  e100  46  78  141  80  13    3.9
5 e53    12  e8.8 e9.1 e58  e90  50  87  783  37  11    4.9
 
6 33    19  e9.5 e9.1 e52  86  103  148  413  32  9.7 3.9
7 24    33  e11    e9.2 e50  81  134  205  283  30  9.1 15   
8 21    19  e11    e9.2 e60  76  89  161  228  41  9.4 7.1
9 19    31  e10    e9.3 1650  69  86  123  186  40  10    9.3
10 18    36  e9.5 e9.3 400  69  75  117  156  31  8.5 12   
 
11 17    24  e9.0 e9.2 216  93  82  440  137  27  6.6 5.4
12 16    22  e11    e9.0 163  92  94  212  123  25  6.4 5.2
13 15    20  e19    e9.0 141  94  71  158  115  25  5.9 5.8
14 15    19  e18    e9.5 208  78  67  794  212  24  5.3 4.9
15 15    18  e16    e13    196  157  240  289  251  21  6.3 2.8
 
16 16    19  e14    e17    139  264  205  180  133  20  12    2.7
17 16    16  e13    e27    105  179  143  213  102  19  8.4 2.7
18 14    14  e12    e24    e100  177  116  172  86  27  16    7.0
19 13    e12  e11    e21    e92  192  101  134  70  23  25    32   
20 13    e11  e10    e19    e86  190  90  200  64  21  11    12   
 
21 13    e11  e9.5 e17    e81  163  83  691  69  43  8.8 7.2
22 13    e11  e9.0 e16    e77  137  159  283  64  29  7.3 5.7
23 13    e12  e8.5 e15    e74  120  153  221  56  23  6.4 11   
24 15    e12  e8.2 e14    1110  100  107  182  51  25  7.2 12   
25 16    e12  e8.0 e13    1260  87  103  159  46  23  7.0 7.3
 
26 14    e12  e7.8 e13    282  77  89  318  44  19  6.4 4.9
27 13    e12  e7.8 e12    215  72  78  258  41  17  6.3 5.1
28 13    e11  e8.0 e12    155  68  71  187  40  16  6.1 4.6
29 13    e11  e8.2 e12    ---  66  66  156  39  16  4.2 3.6
30 13    e10  e8.3 e150    ---  62  63  135  36  15  4.6 3.4
 
31 14    ---  e8.4 e140    ---  56  ---  179  ---  15  5.5 ---   

TOTAL 684.4 489 321.8 662.2 7318 3460 2913 6647 4636 865 295.4 210.1
MEAN 22.1 16.3 10.4 21.4 261 112 97.1 214 155 27.9 9.53 7.00
MAX 184 36 19 150 1650 264 240 794 783 80 25 32
MIN 9.6 10 7.8 8.6 50 56 46 51 36 15 4.2 2.7
CFSM .35 .26 .17 .34 4.19 1.79 1.56 3.44 2.48 .45 .15 .11
IN. .41 .29 .19 .39 4.36 2.06 1.74 3.96 2.76 .52 .18 .13
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2001, BY WATER YEAR (WY)
MEAN 22.8 24.2 26.7 38.4 64.6 77.0 79.3 74.4 70.0 41.5 24.7 19.0
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 .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 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1940 - 2001
ANNUAL TOTAL 17489.9       28501.9      
ANNUAL MEAN 47.8       78.1       48.3      
HIGHEST ANNUAL MEAN 173          1993
LOWEST ANNUAL MEAN 8.67     1957
HIGHEST DAILY MEAN 1150      A     Apr 20 1650              Feb 9 5000          Jul 8 1986
LOWEST DAILY MEAN 3.2           B 2.7           Sep 16, 17 .00     C
ANNUAL SEVEN-DAY MINIMUM 3.3           Jan 25 3.8           Aug 29 .00     Dec 30 1939
MAXIMUM PEAK FLOW 3680      D     Feb 25 9300          Apr 22 1973
MAXIMUM PEAK STAGE 8.60 E     Feb 9 12.65 F Apr 22 1973
INSTANTANEOUS LOW FLOW 1.6           Sep 18
ANNUAL RUNOFF (CFSM) .77     1.25     .77    
ANNUAL RUNOFF (INCHES) 10.43     16.99     10.51    
10 PERCENT EXCEEDS 101          185          94         
50 PERCENT EXCEEDS 22          23          17         
90 PERCENT EXCEEDS 7.3       7.3       1.7      

A - Estimated on basis of graphic reconstruction.
B - Jan. 28, 29, estimated due to backwater from ice.
C - At times in several years.
D - Gage height, 8.20 ft.
E - Ice jam.
F - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data