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 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 1999-2002.
 

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 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 Feb. 22 to Aug. 8, which are fair, and those for estimated daily disharges, which are poor.
DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 4.3 17    16  e15  26  e29  42  73  58  33  24  18   
2 3.9 14    14  e14  16  e25  67  74  58  32  20  17   
3 5.2 12    15  e14  19  e30  75  62  56  30  18  14   
4 6.8 12    16  e14  e17  e50  59  56  363  28  19  13   
5 34    12    17  e15  14  e46  56  53  243  26  89  12   
 
6 13    12    19  16  12  44  52  54  149  32  49  11   
7 7.7 12    15  20  13  51  92  50  114  34  30  10   
8 7.2 12    14  18  13  184  344  48  93  28  25  9.6
9 7.0 12    13  19  16  308  448  58  80  29  22  11   
10 9.6 11    13  20  29  171  214  46  75  26  18  10   
 
11 14    10    13  16  30  130  161  304  189  88  17  9.5
12 9.4 9.7 14  16  31  108  130  807  123  58  17  9.5
13 8.9 10    21  e15  35  92  109  289  244  38  37  7.5
14 12    16    19  e14  33  81  95  210  159  32  20  7.3
15 10    13    16  e13  29  74  89  161  119  29  16  7.2
 
16 9.9 11    15  e13  28  63  79  166  98  26  16  7.7
17 8.2 10    16  e12  26  61  71  147  86  26  14  7.4
18 6.5 9.9 15  e12  25  57  66  122  77  25  12  6.3
19 6.5 12    15  e12  33  53  61  107  68  48  30  6.3
20 6.4 13    14  e12  81  51  57  99  64  36  20  6.6
 
21 6.3 11    14  13  84  46  66  88  59  26  14  6.7
22 11    9.6 19  14  58  43  60  80  54  22  21  6.1
23 93    9.4 31  17  51  46  53  84  51  21  227  5.0
24 43    25    28  16  46  43  57  78  46  20  93  6.3
25 39    25    e24  13  42  41  59  126  46  19  52  7.1
 
26 26    18    e22  16  38  40  50  96  58  18  39  4.9
27 21    21    e20  15  34  38  83  82  51  38  32  4.3
28 18    17    e19  15  e36  39  131  77  42  33  27  4.4
29 16    15    e18  14  ---  48  88  73  38  98  23  4.3
30 16    16    e17  11  ---  46  77  67  35  48  21  3.8
 
31 17    ---    e16  16  ---  40  ---  62  ---  32  19  ---   

TOTAL 496.8 407.6 538 460 915 2178 3091 3899 2996 1079 1081 253.8
MEAN 16.03 13.59 17.35 14.84 32.68 70.26 103.0 125.8 99.87 34.81 34.87 8.460
MAX 93 25 31 20 84 308 448 807 363 98 227 18
MIN 3.9 9.4 13 11 12 25 42 46 35 18 12 3.8
CFSM 0.26 0.22 0.28 0.24 0.52 1.13 1.65 2.02 1.60 0.56 0.56 0.14
IN. 0.30 0.24 0.32 0.27 0.55 1.30 1.84 2.32 1.79 0.64 0.64 0.15
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2002, BY WATER YEAR (WY)
MEAN 22.70 23.99 26.53 38.04 64.10 76.88 79.72 75.22 70.48 41.43 24.88 18.82
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 0.000 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 2001 CALENDAR YEAR FOR 2002 WATER YEAR WATER YEARS 1940 - 2002
ANNUAL TOTAL 28449.1   17395.2  
ANNUAL MEAN 77.94 47.66 48.27    
HIGHEST ANNUAL MEAN 173          1993
LOWEST ANNUAL MEAN 8.67     1957
HIGHEST DAILY MEAN 1650          Feb 9 807          May 12 5000          Jul 8 1986
LOWEST DAILY MEAN 2.7       Sep 16,17 3.8       Sep 30 0.00     A
ANNUAL SEVEN-DAY MINIMUM 3.8       Aug 29 5.0       Sep 24 0.00     Dec 30 1939
MAXIMUM PEAK FLOW 1520          May 12 9300          Apr 22 1973
MAXIMUM PEAK STAGE 5.98     May 12 12.65 B Apr 22 1973
INSTANTANEOUS LOW FLOW 2.1       Oct 2
ANNUAL RUNOFF (CFSM) 1.25 0.76 0.77    
ANNUAL RUNOFF (INCHES) 16.96 10.37 10.51    
10 PERCENT EXCEEDS 184      95      96         
50 PERCENT EXCEEDS 24      26      18         
90 PERCENT EXCEEDS 6.5   9.6   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