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 1999-2000.

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 estimated daily discharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 9.7 6.1 3.0 5.2 e3.5 107  26  74  188  69  27    7.9
2 6.1 5.3 4.0 7.0 e4.0 85  28  66  124  68  24    7.0
3 8.3 7.4 5.3 9.6 e4.7 76  27  61  98  98  20    7.7
4 13    4.2 4.4 9.0 e5.6 70  27  57  85  e611  18    9.2
5 7.8 4.4 14    9.6 e6.5 64  26  50  80  351  22    8.0
 
6 6.5 4.4 16    6.9 e7.5 58  26  47  68  186  26    7.0
7 4.9 4.0 8.4 7.2 e8.5 56  26  46  62  136  41    5.5
8 4.3 5.1 7.0 4.2 e10    52  29  45  55  110  23    5.5
9 4.3 4.3 9.9 7.3 e12    49  27  89  52  92  24    5.3
10 4.4 4.8 22    13    e14    42  26  100  46  132  20    6.0
 
11 4.2 3.8 13    14    e15    42  31  75  52  108  17    7.8
12 5.3 5.1 11    8.8 e15    40  26  65  149  86  15    13   
13 5.1 4.4 9.2 10    14    40  25  57  172  78  15    7.7
14 4.7 3.9 9.3 5.9 13    39  24  50  234  69  14    20   
15 4.2 5.3 9.5 6.4 14    38  23  49  148  63  13    12   
 
16 6.4 4.5 7.1 7.3 14    37  30  47  107  e57  13    6.7
17 7.3 3.6 6.3 13    17    33  67  47  87  e52  11    6.6
18 6.1 3.6 5.4 8.3 24    33  46  68  76  48  10    7.3
19 4.3 3.5 6.7 4.7 27    40  82  73  68  46  9.9 4.9
20 4.4 3.6 6.4 e4.3 27    42  e1150  52  66  42  9.7 9.8
 
21 4.6 3.6 5.6 e4.1 19    38  540  48  62  39  9.1 13   
22 4.4 3.7 3.2 e3.9 42    33  238  47  54  35  11    24   
23 4.1 6.3 e4.0 e3.7 205    33  182  43  51  33  9.6 51   
24 4.9 6.0 e5.0 e3.6 193    36  156  40  389  32  8.9 35   
25 5.3 4.5 e5.5 e3.5 124    33  127  36  298  30  8.3 41   
 
26 4.8 3.7 e6.5 e3.4 487    30  109  37  162  29  6.9 27   
27 4.9 3.5 e7.5 e3.3 193    32  98  50  116  28  7.2 20   
28 4.0 3.6 e9.0 e3.2 132    32  88  41  102  25  15    16   
29 4.3 3.1 7.7 e3.2 106    30  79  38  90  23  14    12   
30 5.6 2.7 6.3 e3.3 ---    28  74  38  78  28  11    11   
 
31 5.5 ---    5.8 e3.4 ---    27  ---  389  ---  34  8.6 ---   

TOTAL 173.7 132.0 244.0 200.3 1757.3 1395 3463 2025 3419 2838 482.2 414.9
MEAN 5.60 4.40 7.87 6.46 60.6 45.0 115 65.3 114 91.5 15.6 13.8
MAX 13 7.4 22 14 487 107 1150 389 389 611 41 51
MIN 4.0 2.7 3.0 3.2 3.5 27 23 36 46 23 6.9 4.9
CFSM .09 .07 .13 .10 .97 .72 1.85 1.05 1.83 1.47 .25 .22
IN. .10 .08 .15 .12 1.05 .83 2.06 1.21 2.04 1.69 .29 .25

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2000, BY WATER YEAR (WY)
MEAN 22.8 24.3 27.0 38.7 61.2 76.4 79.0 72.1 68.6 41.8 25.0 19.2
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 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1940 - 2000
ANNUAL TOTAL 21279.4   16544.4      
ANNUAL MEAN 58.3   45.2       47.7      
HIGHEST ANNUAL MEAN 173          1993
LOWEST ANNUAL MEAN 8.67     1957
HIGHEST DAILY MEAN 609          Apr 16 1150      A     Apr 20 5000          Jul 8 1986
LOWEST DAILY MEAN 1.9       Sep 22, 25 2.7           Nov 30 .00     B
ANNUAL SEVEN-DAY MINIMUM 2.2       Sep 17 3.3           Jan 25 .00     Dec 30 1939
INSTANTANEOUS PEAK FLOW 2430              Apr 20 9300          Apr 22 1973
INSTANTANEOUS PEAK STAGE 7.05         Apr 20 12.65 C Apr 22 1973
INSTANTANEOUS LOW FLOW 1.2           Nov 30
ANNUAL RUNOFF (CFSM) .93 .72     .77    
ANNUAL RUNOFF (INCHES) 12.69 9.86     10.40    
10 PERCENT EXCEEDS 150      99          92         
50 PERCENT EXCEEDS 41      18          17         
90 PERCENT EXCEEDS 3.7   4.2       1.6      
A - Estimated on basis of graphic reconstruction.
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