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.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1951 to current year.
 

STAGE: Water years 1994-2001.

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

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

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,310 ft3/s, July 18, 1996, from rating curve extended above 2,800 ft3/s, gage height, 11.10 ft; no flow at times in most 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 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.6 3.2 7.3 e4.6 67  29    9.1 7.3 36    1.5   4.3 8.7
2 3.6 3.6 6.7 e4.7 e35  24    8.6 6.4 17    1.3   77    5.8
3 3.4 3.7 5.9 e4.8 e22  20    7.8 5.7 12    4.2   51    4.4
4 53    3.5 5.6 e4.9 e18  17    7.8 5.1 9.9 4.7   15    4.0
5 26    2.8 4.9 e4.9 e15  14    8.7 4.8 59    2.8   9.6 3.3
 
6 17    3.0 5.1 e4.9 e16  12    13    4.6 70    1.8   7.3 3.3
7 10    31    5.0 e4.8 e19  12    14    8.9 31    1.5   5.9 9.3
8 7.9 12    4.9 e4.8 88  17    9.9 6.4 18    1.6   4.8 5.6
9 6.5 49    5.1 e4.7 518  9.7 11    4.8 12    1.4   4.2 8.1
10 5.2 64    5.0 e4.7 255  8.8 10    4.8 9.7 1.2   5.8 9.2
 
11 4.2 28    e6.0 e4.6 112  10    10    8.1 8.0 .86 4.1 6.4
12 3.8 16    e7.5 e4.6 64  14    25    7.0 9.3 .59 3.2 4.1
13 3.4 31    e6.7 e5.0 51  19    15    5.4 8.6 .43 2.6 3.6
14 3.3 27    e6.3 31    59  16    15    4.9 6.9 .21 2.2 3.3
15 3.1 16    e6.0 61    59  27    57    4.8 8.5 .62 1.9 2.9
 
16 3.0 13    e5.7 49    45  64    52    4.8 6.7 .51 6.1 3.0
17 3.0 9.4 e5.3 35    34  67    31    5.4 5.2 1.4   4.8 3.0
18 2.9 7.3 e5.0 25    28  66    21    5.1 4.8 2.3   5.1 4.2
19 2.9 6.5 e4.8 19    20  52    17    4.6 4.3 1.4   7.0 64   
20 3.1 6.0 e4.6 15    19  38    28    3.9 3.6 1.1   4.7 23   
 
21 3.4 5.5 e4.5 e12    17  29    64    5.9 5.7 6.3   3.4 12   
22 3.2 5.0 e4.4 e10    15  22    64    5.8 6.7 123      2.8 7.0
23 3.1 4.7 e4.3 e9.0 13  19    49    5.1 4.7 36      2.4 10   
24 6.5 4.5 e4.2 e8.3 95  15    30    5.4 3.6 15      2.5 22   
25 6.3 4.4 e4.1 e7.7 239  13    20    4.8 2.9 53      53    8.2
 
26 5.0 8.4 e4.0 e7.1 93  11    16    16    2.4 32      31    6.3
27 5.1 9.7 e4.0 e6.7 58  11    14    55    2.1 13      11    5.0
28 4.7 7.9 e4.0 e7.5 37  10    11    22    1.8 8.8   7.1 3.8
29 4.0 8.1 e4.1 e10    ---  9.9 11    13    1.6 7.2   5.1 3.7
30 3.5 8.8 e4.2 129    ---  9.5 8.3 10    1.8 5.9   4.5 3.2
 
31 3.5 ---    e4.4 114    ---  9.1 ---    8.9 ---    5.0   16    ---   

TOTAL 217.2 403.0 159.6 618.3 2111 695.0 658.2 264.7 373.8 336.62 365.4 260.4
MEAN 7.01 13.4 5.15 19.9 75.4 22.4 21.9 8.54 12.5 10.9 11.8 8.68
MAX 53 64 7.5 129 518 67 64 55 70 123 77 64
MIN 2.9 2.8 4.0 4.6 13 8.8 7.8 3.9 1.6 .21 1.9 2.9
CFSM .34 .64 .25 .95 3.61 1.07 1.05 .41 .60 .52 .56 .42
IN. .39 .72 .28 1.10 3.76 1.24 1.17 .47 .67 .60 .65 .46
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2001, BY WATER YEAR (WY)
MEAN 9.62 14.0 16.6 17.0 22.1 34.4 36.5 23.2 18.8 11.5 5.61 7.79
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 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1951 - 2001
ANNUAL TOTAL 7869.6   6463.22
ANNUAL MEAN 21.5   17.7   18.0      
HIGHEST ANNUAL MEAN 39.9       1993
LOWEST ANNUAL MEAN 3.37     1963
HIGHEST DAILY MEAN 344          Apr 20 518          Feb 9 2190          Jul 18 1996
LOWEST DAILY MEAN 1.9       A .21     Jul 14 .00     B
ANNUAL SEVEN-DAY MINIMUM 1.9       Jan 24 .63     Jul 10 .00     Aug 27 1953
MAXIMUM PEAK FLOW 635          Feb 9 5310      C Jul 18 1996
MAXIMUM PEAK STAGE 6.43     Feb 9 11.10     Jul 18 1996
INSTANTANEOUS LOW FLOW .13     Jul 14
ANNUAL RUNOFF (CFSM) 1.03 .85 .86    
ANNUAL RUNOFF (INCHES) 14.01 11.50 11.72    
10 PERCENT EXCEEDS 54      49      42         
50 PERCENT EXCEEDS 6.5   7.0   5.2      
90 PERCENT EXCEEDS 3.0   3.0   .10    

A- Jan. 25-28, estimated due to backwater from ice.
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