Station list     Available data
ILLINOIS RIVER BASIN


05537500                   LONG RUN NEAR LEMONT, IL



LOCATION.--Lat 41°38'33", long 87°59'57", in SW1/4SE1/4 sec.32, T.37 N., R.11 E., Cook County, Hydrologic Unit 07120004, on left bank at downstream side of bridge on State Street, 2 mi south of Lemont, and at mile 5.4.

DRAINAGE AREA.--20.9 mi2.

PERIOD OF RECORD.--July 1951 to current year.

REVISED RECORDS.--WSP 1338: 1952(M). WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 637.20 ft above sea level.

REMARKS.--Records good except those for Apr. 11 - Aug. 5, which are fair. Gage-height telemeter at station.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 4.6   2.8 6.5 9.2 25  13  113  25    4.6 11    1.3 1.8
2 4.2   2.2 5.0 8.7 79  13  84  20    3.9 8.3 1.3 1.8
3 4.2   2.2 4.0 24    54  12  50  16    4.3 8.3 1.4 2.7
4 4.4   2.1 4.1 127    35  18  35  18    5.2 43    46    2.2
5 4.9   1.9 3.7 124    25  21  25  16    3.5 17    70    1.7
 
6 3.4   2.5 3.2 151    20  19  21  73    4.3 11    26    1.8
7 1.4   3.1 3.0 84    17  17  20  611    3.2 36    15    121   
8 2.2   2.8 2.9 95    15  73  79  401    2.9 24    25    40   
9 3.4   2.9 2.7 111    14  168  84  194    11    12    16    14   
10 3.9   4.8 3.9 60    13  114  44  86    8.3 8.5 10    9.1
 
11 3.1   1.9 8.3 35    93  68  29  51    41    7.0 7.1 6.4
12 3.3   1.4 6.7 25    116  42  23  37    40    5.8 5.7 5.0
13 5.5   1.3 7.2 20    54  33  23  31    16    4.9 4.4 4.2
14 5.7   1.4 5.3 17    35  30  69  23    10    4.5 3.5 3.6
15 3.5   3.2 4.6 16    28  28  42  17    9.6 4.0 2.6 5.0
 
16 2.7   5.4 5.2 13    23  27  30  14    7.0 3.5 2.1 4.2
17 2.2   2.5 6.7 12    47  93  22  12    6.7 2.7 2.4 3.1
18 2.1   2.3 6.5 11    95  368  18  10    6.0 2.5 2.8 2.6
19 1.7   3.9 6.6 9.7 56  203  16  8.7 16    7.4 2.1 2.4
20 1.2   3.3 6.9 9.3 38  108  19  7.8 9.4 5.5 2.0 3.1
 
21 .89 2.1 6.3 8.3 29  59  49  7.4 6.7 4.4 2.0 3.2
22 .88 3.2 7.0 8.5 22  39  33  7.3 5.3 5.6 3.1 2.8
23 .99 2.0 13    9.0 19  30  25  6.7 4.4 4.5 2.6 2.1
24 1.0   1.7 12    8.8 24  26  18  12    3.6 3.1 4.4 1.8
25 1.3   2.9 31    8.0 20  21  17  9.2 3.0 2.5 6.2 1.8
 
26 2.3   2.2 29    7.4 17  18  21  7.0 234    2.2 2.7 1.9
27 24      2.0 18    7.1 17  16  32  5.8 90    1.8 2.1 2.0
28 9.7   5.3 13    7.4 14  31  20  5.2 39    1.8 5.4 2.1
29 5.3   9.4 11    9.9 ---  29  34  7.9 23    1.6 4.7 2.1
30 3.8   11    9.9 12    ---  21  31  6.3 16    1.4 2.9 3.9
 
31 3.3   ---    8.4 13    ---  55  ---  5.1 ---    1.3 2.2 ---   

TOTAL 121.06 95.7 261.6 1061.3 1044 1813 1126 1751.4 637.9 257.1 285.0 259.4
MEAN 3.91 3.19 8.44 34.2 37.3 58.5 37.5 56.5 21.3 8.29 9.19 8.65
MAX 24 11 31 151 116 368 113 611 234 43 70 121
MIN .88 1.3 2.7 7.1 13 12 16 5.1 2.9 1.3 1.3 1.7
CFSM .19 .15 .40 1.64 1.78 2.80 1.80 2.70 1.02 .40 .44 .41
IN. .22 .17 .47 1.89 1.86 3.23 2.00 3.12 1.14 .46 .51 .46


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1998, BY WATER YEAR (WY)
MEAN 9.83 14.4 17.0 16.2 21.3 35.5 35.6 22.9 17.4 11.3 5.35 7.83
MAX 163 71.9 92.2 75.5 104 131 86.9 74.5 89.6 126 27.4 74.9
(WY) 1955 1986 1983 1993 1997 1979 1975 1966 1993 1996 1972 1961
MIN .000 .006 .016 .020 .028 2.19 1.69 2.83 .73 .048 .000 .000
(WY) 1965 1972 1964 1977 1964 1964 1963 1958 1988 1961 1964 1963

SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1951 - 1998
ANNUAL TOTAL 6375.26 8713.46
ANNUAL MEAN 17.5   23.9   17.8      
HIGHEST ANNUAL MEAN 39.9       1993
LOWEST ANNUAL MEAN 3.37     1963
HIGHEST DAILY MEAN 1090          Feb 21 611          May 7 2190          Jul 18 1996
LOWEST DAILY MEAN .88     Oct 22 .88     Oct 22 .00     A
ANNUAL SEVEN-DAY MINIMUM 1.1       Oct 19 1.1       Oct 19 .00     Aug 27 1953
INSTANTANEOUS PEAK FLOW 820          May 7 5310      B Jul 18 1996
INSTANTANEOUS PEAK STAGE 6.95     May 7 11.10     Jul 18 1996
INSTANTANEOUS LOW FLOW .71     Oct 22-24
ANNUAL RUNOFF (CFSM) .84 1.14 .85    
ANNUAL RUNOFF (INCHES) 11.35 15.51 11.58    
10 PERCENT EXCEEDS 24      54      42         
50 PERCENT EXCEEDS 6.5   8.3   5.0      
90 PERCENT EXCEEDS 2.0   2.1   .10    
A - At times in most years.
B - From rating curve extended above 2,800 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data