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 estimated daily discharges, which are poor. Gage-height telemeter at station.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 7.3 9.2 5.6 e2.6 35    12    6.2 44    33    19    2.6 3.2
2 4.6 8.5 3.8 e2.4 56    11    5.9 31    261    13    2.0 2.9
3 13    8.8 3.3 e3.0 52    15    5.6 23    98    8.7 1.9 2.6
4 6.7 6.2 3.1 e3.6 37    12    7.3 18    46    6.9 1.8 2.3
5 4.4 4.2 3.0 e3.3 28    11    7.3 17    28    5.4 1.6 2.2
 
6 5.4 3.9 21    e3.1 26    22    8.1 21    19    4.9 1.4 2.1
7 5.8 3.2 109    e2.9 22    19    6.1 20    14    4.2 1.4 2.1
8 3.8 3.2 39    e2.8 19    17    11    14    10    3.8 1.6 2.1
9 2.9 3.4 21    e2.7 17    18    213    12    11    3.5 1.6 2.0
10 2.4 75    14    e2.6 15    18    86    10    9.5 3.3 1.6 1.9
 
11 2.1 57    11    e2.6 15    17    51    12    23    3.0 1.7 2.0
12 1.9 25    9.2 e2.5 18    17    35    46    49    2.7 2.2 2.3
13 2.3 16    8.2 e2.5 13    21    25    36    118    2.9 4.2 3.8
14 2.1 13    7.2 e2.4 11    20    19    18    86    2.4 3.0 3.1
15 1.9 10    6.3 e2.4 11    22    52    14    33    2.3 2.3 2.7
 
16 2.3 8.5 5.8 e3.0 11    48    299    11    20    2.1 1.8 2.1
17 13    7.1 5.1 e7.0 11    95    172    63    15    15    1.7 1.4
18 85    5.8 4.9 e40    9.3 61    87    31    11    15    1.5 1.4
19 31    5.4 4.4 47    9.0 35    55    18    8.8 6.9 6.2 1.6
20 13    4.7 3.9 42    8.0 26    38    13    8.0 5.1 4.1 2.1
 
21 8.9 4.1 e3.8 42    7.7 20    36    35    7.1 5.4 2.7 1.9
22 6.6 3.7 e3.9 430    7.4 16    73    215    20    18    2.1 2.0
23 5.2 3.5 e3.4 496    7.0 13    235    98    33    9.2 2.3 1.8
24 4.5 3.1 e3.0 255    6.6 11    115    70    60    21    25    2.4
25 4.0 3.0 e2.8 127    7.1 9.7 63    36    36    8.4 61    2.5
 
26 3.5 3.0 e2.7 76    7.7 9.2 39    23    21    5.2 23    2.3
27 4.1 2.8 e2.6 82    14    8.7 233    17    42    4.0 12    4.7
28 15    2.5 e2.5 91    14    7.8 342    13    26    3.2 7.5 28   
29 8.6 2.6 e2.4 53    ---    7.4 142    10    20    2.8 5.5 27   
30 20    3.7 e3.1 40    ---    6.7 69    8.5 12    2.9 4.3 8.5
 
31 13    ---    e2.8 35    ---    6.1 ---    13    ---    2.2 3.7 ---   

TOTAL 304.3 310.1 321.8 1907.4 494.8 632.6 2536.5 1010.5 1178.4 212.4 195.3 127.0
MEAN 9.82 10.3 10.4 61.5 17.7 20.4 84.6 32.6 39.3 6.85 6.30 4.23
MAX 85 75 109 496 56 95 342 215 261 21 61 28
MIN 1.9 2.5 2.4 2.4 6.6 6.1 5.6 8.5 7.1 2.1 1.4 1.4
CFSM .47 .49 .50 2.94 .85 .98 4.05 1.56 1.88 .33 .30 .20
IN. .54 .55 .57 3.39 .88 1.13 4.51 1.80 2.10 .38 .35 .23

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1999, BY WATER YEAR (WY)
MEAN 9.83 14.3 16.9 17.2 21.2 35.2 36.6 23.1 17.8 11.2 5.37 7.76
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 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1951 - 1999
ANNUAL TOTAL 9171.3   9231.1  
ANNUAL MEAN 25.1   25.3   18.0      
HIGHEST ANNUAL MEAN 39.9       1993
LOWEST ANNUAL MEAN 3.37     1963
HIGHEST DAILY MEAN 611          May 7 496          Jan 23 2190          Jul 18 1996
LOWEST DAILY MEAN 1.3       Jul 31-Aug 2 1.4       A .00     B
ANNUAL SEVEN-DAY MINIMUM 1.4       Jul 28 1.6       Aug 5 .00     Aug 27 1953
INSTANTANEOUS PEAK FLOW 604          Jan 23 5310      C Jul 18 1996
INSTANTANEOUS PEAK STAGE 6.33     Jan 23 11.10     Jul 18 1996
INSTANTANEOUS LOW FLOW 1.3       Sep 17, 18
ANNUAL RUNOFF (CFSM) 1.20 1.21 .86    
ANNUAL RUNOFF (INCHES) 16.32 16.43 11.69    
10 PERCENT EXCEEDS 59      56      42         
50 PERCENT EXCEEDS 9.2   8.5   5.1      
90 PERCENT EXCEEDS 2.4   2.3   .10    
A - Aug. 6-7, Sept. 17-18.
B - At times in most years.
C - 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