Station list     Available data
ILLINOIS RIVER BASIN


05533000       FLAG CREEK NEAR WILLOW SPRINGS, IL

 

LOCATION.-- Lat 41°44'20", long 87°53'47" (NAD of 1983), in SE1/4NE1/4 sec.31, T.38 N., R.12 E., Cook County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on German Church Road, 1.1 mi northwest of Willow Springs, and at mile 2.2.
 

DRAINAGE AREA.-- 16.5 mi2.
 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1951 to current year.
 

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY
 

MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000.

BIOLOGICAL
 

ALGAE: Water year 2000.
 

BENTHIC MACROINVERTEBRATES: Water year 2000.
 

FISH: Water year 2001.
 

HABITAT: Water year 2000-01.
 

REVISED RECORDS.-- WDR IL-75-1: Drainage area.
 

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 606.36 ft above NGVD of 1929 (606.08 ft NAVD 1988). Prior to June 17, 1963, water-stage recorder at same site at datum 3.73 ft higher. However, datum incorrectly published as 609.64 ft above NGVD of 1929 from 1951 to 1963. June 17, 1963, to June 26, 1964, nonrecording gage at site 0.5 mi upstream at datum 4.82 ft higher.
 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,680 ft3/s, Sept. 14, 1961, gage height, 13.71 ft, present datum; minimum daily, 0.1 ft3/s, Dec. 9, 1957.
 

REMARKS FOR CURRENT YEAR.-- Records good except those greater than 100 ft3/s, which are fair. Effluent from sewage-treatment plant 2 mi. upstream averaged 18.3 ft3/s during the year. The maximum monthly average was 27.2 ft3/s in January, and the minimum was 13.5 ft3/s in September.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2004 TO SEPTEMBER 2005
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 13    68  77  34  20  39  55  17  14  15  13  10   
2 24    47  42  142  20  32  77  17  13  12  13  9.6
3 12    26  34  109  21  30  48  16  13  12  13  9.1
4 12    58  31  79  25  28  39  16  28  12  13  8.9
5 12    32  27  54  36  27  34  17  19  13  12  8.8
 
6 10    26  41  46  40  26  29  15  15  13  11  9.3
7 11    24  164  39  71  29  27  15  14  12  11  9.6
8 23    19  83  33  58  26  25  14  14  12  12  9.7
9 14    20  50  30  42  24  23  17  14  11  12  10   
10 11    19  40  31  36  25  22  17  31  11  18  9.2
 
11 11    19  34  46  32  27  22  24  21  12  32  8.6
12 11    18  30  215  30  24  65  21  15  11  18  9.5
13 11    18  26  445  53  22  43  23  15  12  14  9.3
14 12    17  24  139  171  22  31  18  15  12  12  11   
15 13    16  24  68  110  21  26  15  14  12  12  9.9
 
16 12    17  23  46  90  21  24  15  13  11  12  14   
17 7.6 18  22  36  53  21  23  15  13  10  12  10   
18 12    18  21  32  40  21  19  14  12  11  26  9.4
19 14    37  20  28  32  23  21  49  12  11  15  15   
20 13    26  20  27  46  21  21  24  13  15  38  12   
 
21 12    20  20  26  48  22  21  18  13  13  15  11   
22 11    20  19  25  39  22  45  15  13  13  13  12   
23 54    19  19  23  35  23  26  17  14  13  12  10   
24 18    26  18  24  32  22  20  15  15  12  12  34   
25 14    38  17  24  30  47  18  14  14  34  11  20   
 
26 12    31  17  25  28  38  16  14  13  53  11  14   
27 12    103  18  22  26  30  17  14  13  41  10  13   
28 12    73  18  21  53  28  18  14  14  18  10  25   
29 15    46  18  21  ---  24  18  13  16  15  11  21   
30 14    49  18  20  ---  79  17  13  30  13  11  13   
 
31 13    ---  24  21  ---  115  ---  14  ---  12  10  ---   

TOTAL 445.6 968 1039 1931 1317 959 890 540 473 477 445 375.9
MEAN 14.4 32.3 33.5 62.3 47.0 30.9 29.7 17.4 15.8 15.4 14.4 12.5
MAX 54 103 164 445 171 115 77 49 31 53 38 34
MIN 7.6 16 17 20 20 21 16 13 12 10 10 8.6


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2005, BY WATER YEAR (WY)
MEAN 15.9 20.1 19.6 19.1 22.8 32.0 35.3 27.7 21.7 18.3 17.9 17.0
MAX 100 69.6 86.6 62.3 98.8 110 95.0 90.9 68.1 67.7 66.8 106
(WY) 1955 1991 1983 2005 1997 1979 1983 1996 1993 1996 1987 1961
MIN 2.30 2.37 2.83 2.44 4.05 5.88 7.00 4.94 5.64 4.94 4.65 3.01
(WY) 1954 1954 1959 1956 1963 1957 1971 1958 1956 1952 1953 1954

SUMMARY STATISTICS FOR 2004 CALENDAR YEAR FOR 2005 WATER YEAR WATER YEARS 1951 - 2005
ANNUAL TOTAL 10005.9 9860.5  
ANNUAL MEAN 27.3 27.0   22.3      
HIGHEST ANNUAL MEAN 39.6       1983
LOWEST ANNUAL MEAN 7.79     1953
HIGHEST DAILY MEAN 338        Aug 28 445          Jan 13 1040          Jul 18 1996
LOWEST DAILY MEAN 7.6     Oct 17 7.6       Oct 17 0.10     Dec 9 1957
ANNUAL SEVEN-DAY MINIMUM 11        Oct 11 9.3       Sep 2 1.0       Feb 3 1959
MAXIMUM PEAK FLOW 692          Jan 13 2680          Sep 14 1961
MAXIMUM PEAK STAGE 7.50     Jan 13 13.71 A Sep 14 1961
INSTANTANEOUS LOW FLOW 1.3       Oct 17
10 PERCENT EXCEEDS 47    47      42         
50 PERCENT EXCEEDS 18    19      14         
90 PERCENT EXCEEDS 12    11      4.6      

A - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data