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 1994-2000.

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 Feb. 10-13 and estimated daily discharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.3   1.1   1.4 e3.2 e2.0 13    5.0 15    324  13    15    2.4
2 1.9   1.0   1.4 e3.5 e2.1 10    6.2 15    127  11    13    2.5
3 5.0   .90 2.0 3.8 e2.1 8.6 5.3 12    61  78    14    2.6
4 17      .86 23    5.1 e2.1 8.1 4.7 9.9 39  39    9.0 2.5
5 6.6   1.1   103    4.4 e2.1 7.2 3.9 8.8 91  23    22    2.3
 
6 3.0   1.5   61    3.6 e2.1 6.7 3.6 8.5 51  16    45    2.1
7 2.1   2.0   35    3.2 e2.2 6.0 4.1 8.0 30  12    62    2.3
8 1.7   2.0   20    3.3 e3.1 5.8 8.2 8.1 20  10    24    2.7
9 1.5   1.7   13    5.6 e5.0 5.7 7.4 62    15  8.9 14    2.7
10 1.5   1.3   10    12    9.1 5.4 5.8 87    11  205    8.8 4.4
 
11 1.5   1.5   7.6 12    11    5.1 7.0 55    14  105    7.0 13   
12 1.7   1.5   6.8 8.4 13    4.8 6.1 52    214  46    5.8 70   
13 1.7   1.4   6.0 6.3 14    4.8 5.1 72    190  29    5.0 20   
14 1.7   1.5   5.3 5.5 9.0 4.7 5.0 35    171  20    4.6 16   
15 1.7   1.7   6.2 5.0 6.0 4.4 4.6 23    153  15    4.1 11   
 
16 1.7   1.9   9.8 e4.2 5.7 5.6 11    20    67  11    3.7 6.5
17 2.0   1.9   7.6 e3.7 6.1 4.5 114    17    40  9.5 21    5.2
18 2.1   1.1   6.4 e3.3 6.2 4.0 46    48    27  7.9 16    4.7
19 2.0   .29 5.7 e3.0 6.3 5.6 78    142    19  7.1 8.6 4.2
20 1.1   .29 e4.9 e2.8 6.4 15    344    56    21  6.2 6.2 4.1
 
21 .42 .30 e4.3 e2.6 6.7 13    305    36    59  5.5 5.2 6.3
22 .74 .30 e3.6 e2.4 34    8.5 150    28    30  5.3 4.4 5.3
23 .60 2.0   e3.2 e2.2 45    7.5 89    28    18  5.1 3.9 13   
24 .82 5.4   e2.6 e2.0 65    7.0 61    18    37  5.0 5.2 15   
25 .95 2.7   e2.3 e1.9 57    6.8 40    12    179  4.6 4.7 11   
 
26 .85 2.0   e2.1 e1.9 32    6.4 29    9.8 65  4.0 3.6 6.8
27 .87 1.7   e2.3 e1.9 24    6.9 23    23    34  4.7 3.1 5.0
28 .68 1.5   e2.4 e1.9 18    6.6 18    186    22  7.8 2.8 4.1
29 .37 1.5   e2.6 e2.0 15    6.0 22    65    20  5.7 2.8 3.8
30 1.0   1.2   e2.8 e2.0 ---    5.4 16    39    16  14    2.8 4.0
 
31 1.2   ---      e3.0 e2.0 ---    5.0 ---    188    ---  19    2.5 ---   

TOTAL 69.30 45.14 367.3 124.7 412.3 214.1 1428.0 1387.1 2165 753.3 349.8 255.5
MEAN 2.24 1.50 11.8 4.02 14.2 6.91 47.6 44.7 72.2 24.3 11.3 8.52
MAX 17 5.4 103 12 65 15 344 188 324 205 62 70
MIN .37 .29 1.4 1.9 2.0 4.0 3.6 8.0 11 4.0 2.5 2.1
CFSM .11 .07 .57 .19 .68 .33 2.28 2.14 3.45 1.16 .54 .41
IN. .12 .08 .65 .22 .73 .38 2.54 2.47 3.85 1.34 .62 .45

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2000, BY WATER YEAR (WY)
MEAN 9.67 14.0 16.8 16.9 21.1 34.6 36.8 23.5 18.9 11.5 5.48 7.77
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 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1951 - 2000
ANNUAL TOTAL 8776.64 7571.54    
ANNUAL MEAN 24.0   20.7       18.0      
HIGHEST ANNUAL MEAN 39.9       1993
LOWEST ANNUAL MEAN 3.37     1963
HIGHEST DAILY MEAN 496          Jan 23 344              Apr 20 2190          Jul 18 1996
LOWEST DAILY MEAN .29     Nov 19, 20 .29         Nov 19, 20 .00     A
ANNUAL SEVEN-DAY MINIMUM .73     Oct 23 .73         Oct 23 .00     Aug 27 1953
INSTANTANEOUS PEAK FLOW 568              May 31 5310      B Jul 18 1996
INSTANTANEOUS PEAK STAGE 6.20         May 31 11.10     Jul 18 1996
INSTANTANEOUS LOW FLOW .29 C     Nov 18-22
ANNUAL RUNOFF (CFSM) 1.15 .99     .86    
ANNUAL RUNOFF (INCHES) 15.62 13.48     11.72    
10 PERCENT EXCEEDS 54      55          42         
50 PERCENT EXCEEDS 7.1   6.0       5.1      
90 PERCENT EXCEEDS 1.5   1.6       .10    
A - At times in most years.
B - From rating curve extended above 2,800 ft3/s.
 C - Minimum recorded, but may have been less during Nov. 18-22.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data