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: 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 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). 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.
 

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.8 6.7 6.4 6.5 e4.1 e4.6 8.2 430  27  19  20    3.4  
2 11    6.5 6.4 9.1 e4.8 e4.5 7.5 181  27  18  23    2.8  
3 10    6.6 7.1 6.3 e5.5 e4.6 7.2 123  30  18  15    1.7  
4 24    6.7 8.4 5.2 e5.0 e5.0 8.4 140  28  17  17    2.2  
5 20    6.8 6.3 6.1 e4.5 e5.5 9.3 572  26  15  14    3.3  
 
6 8.6 7.2 3.9 5.8 e4.0 e4.6 6.7 201  32  14  17    1.6  
7 6.2 7.7 4.0 5.3 e3.7 e4.5 8.2 143  40  13  14    0.60
8 7.0 8.2 4.1 7.6 e3.4 e4.4 9.1 118  33  33  10    0.56
9 8.3 9.8 4.5 7.9 e3.2 e4.8 7.5 504  39  34  8.9 0.52
10 7.0 9.5 4.0 8.2 e3.1 e5.2 9.1 242  56  100  7.8 0.42
 
11 5.5 11    4.0 e17    e3.0 e4.8 10    172  56  48  8.3 0.37
12 5.0 9.2 5.0 e4.8 e2.9 19    8.0 123  46  33  7.2 0.69
13 4.7 6.9 6.7 e4.5 e2.8 285    6.7 102  40  27  6.6 12     
14 4.7 8.0 7.3 e4.2 e2.8 95    7.7 123  36  23  5.9 29     
15 4.7 7.9 7.7 e4.0 e2.9 47    6.9 102  32  21  5.4 12     
 
16 4.9 6.8 7.8 e3.8 e2.9 48    7.5 83  29  18  5.2 3.7  
17 7.2 6.6 7.5 e3.7 e3.0 42    23    73  27  18  4.7 1.9  
18 6.7 6.6 17    e3.6 e3.2 32    15    65  26  18  4.6 1.3  
19 5.3 7.8 30    e3.5 e3.7 26    14    63  26  17  4.7 1.7  
20 5.3 8.2 17    e3.4 e5.0 22    33    57  24  17  5.7 1.6  
 
21 4.8 7.1 12    e3.3 e9.0 18    27    50  21  96  5.2 1.4  
22 6.5 8.4 8.0 e3.2 e18    14    22    46  20  31  2.6 2.5  
23 7.2 8.9 6.5 e3.0 e15    12    18    46  20  25  2.1 2.0  
24 6.3 6.9 6.7 e2.8 e10    11    17    43  19  24  1.9 1.1  
25 12    6.3 5.9 e2.5 e7.0 11    16    40  23  19  1.8 0.76
 
26 11    4.7 5.0 e2.5 e5.5 8.9 14    36  52  17  1.6 0.75
27 7.7 4.7 4.8 e2.6 e5.1 7.7 13    35  30  29  1.4 1.3  
28 7.8 5.5 5.7 e2.7 e4.8 16    12    38  24  24  1.2 1.1  
29 9.1 6.5 6.1 e2.8 ---    19    16    36  22  19  1.2 0.94
30 7.2 7.3 10    e3.2 ---    13    35    32  20  16  1.1 0.73
 
31 8.2 ---    10    e3.6 ---    9.6 ---    30  ---  15  1.8 ---     

TOTAL 247.7 221.0 245.8 152.7 147.9 808.7 403.0 4049 931 836 226.9 93.94
MEAN 7.99 7.37 7.93 4.93 5.28 26.1 13.4 131 31.0 27.0 7.32 3.13
MAX 24 11 30 17 18 285 35 572 56 100 23 29
MIN 3.8 4.7 3.9 2.5 2.8 4.4 6.7 30 19 13 1.1 0.37
CFSM 0.13 0.12 0.13 0.08 0.08 0.42 0.22 2.09 0.50 0.43 0.12 0.05
IN. 0.15 0.13 0.15 0.09 0.09 0.48 0.24 2.41 0.56 0.50 0.14 0.06
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2003, BY WATER YEAR (WY)
MEAN 22.5 23.7 26.2 37.5 63.1 76.1 78.7 76.1 69.8 41.2 24.6 18.6
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 2002 CALENDAR YEAR FOR 2003 WATER YEAR WATER YEARS 1940 - 2003
ANNUAL TOTAL 16667.3   8363.64
ANNUAL MEAN 45.7   22.9   47.8      
HIGHEST ANNUAL MEAN 173          1993
LOWEST ANNUAL MEAN 8.67     1957
HIGHEST DAILY MEAN 807          May 12 572          May 5 5000          Jul 8 1986
LOWEST DAILY MEAN 3.8       Sep 30-Oct 1 0.37     Sep 11 0.00     A
ANNUAL SEVEN-DAY MINIMUM 4.2       Dec 6 0.68     Sep 6 0.00     Dec 30 1939
MAXIMUM PEAK FLOW 1170          May 5 9300          Apr 22 1973
MAXIMUM PEAK STAGE 5.46     May 5 12.65 B Apr 22 1973
INSTANTANEOUS LOW FLOW 0.28     Sep 11
ANNUAL RUNOFF (CFSM) 0.73 0.37 0.77    
ANNUAL RUNOFF (INCHES) 9.94 4.99 10.42    
10 PERCENT EXCEEDS 95      41      96         
50 PERCENT EXCEEDS 24      7.8   18         
90 PERCENT EXCEEDS 6.3   2.7   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