Station list     Available data
ILLINOIS RIVER BASIN


05533400                         SAWMILL CREEK NEAR LEMONT, IL



LOCATION.--Lat 41°42'28", long 87°57'45", in NE1/4SW1/4 sec.10, T.37 N., R.11 E., Du Page County, Hydrologic Unit 07120004, on concrete abutment on right bank, 50 ft upstream from bridge on Bluff Road at south edge of Argonne National Laboratory, 2.5 mi northeast of Lemont, and at mile 1.

DRAINAGE AREA.--13.0 mi2

PERIOD OF RECORD.--Annual maximum, water years 1961-79. December 1985 to current year

REVISED RECORDS.--WDR IL-77-1: 1961-76(M).

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 630.00 ft above sea level. Oct. 11, 1961, to Sept. 30, 1976, crest-stage gage on bridge 50 ft downstream at datum 11.22 ft higher.

REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height telemeter and recording rain gage at station.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,070 ft3/s, July 18, 1996, gage height 17.53 ft.
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 5.3   4.6 5.0 e1.9 17    6.2 3.5 19    37    20      .67 2.6  
2 11      3.9 3.8 e1.8 43    6.5 3.2 13    104    5.9   .34 1.5  
3 15      3.4 3.4 e2.1 28    6.8 3.0 9.8 30    3.9   .21 1.4  
4 5.4   3.3 3.2 e2.6 19    5.2 5.9 8.4 14    3.7   .13 .44
5 8.7   3.2 2.9 e2.4 11    5.5 3.4 8.0 10    3.3   .11 .16
 
6 10      2.9 43    e2.3 12    11    3.9 15    8.4 2.5   .10 .16
7 6.1   2.5 48    e2.2 8.7 9.3 3.2 11    8.7 2.0   2.0   .19
8 3.8   2.8 17    e2.1 6.7 7.6 14    8.1 5.6 1.7   2.3   .18
9 2.8   2.9 9.6 e2.0 6.5 7.4 226    6.7 7.3 1.2   .34 .11
10 2.3   95    6.7 e2.0 6.0 9.1 57    6.0 5.5 .87 .38 .10
 
11 1.8   28    5.6 e1.9 10    9.3 56    19    14    .36 .19 .09
12 1.5   13    4.9 e1.9 9.4 10    25    138    13    .28 4.6   .36
13 1.3   9.3 4.6 e1.8 5.5 9.8 14    45    56    .17 4.3   3.8  
14 1.2   7.1 4.1 e1.8 4.7 9.2 11    20    25    .20 3.3   1.0  
15 1.0   5.5 3.8 e1.9 4.8 13    74    13    9.2 .22 .78 .26
 
16 .95 4.9 3.6 e2.1 4.9 29    176    10    7.2 .20 .22 .13
17 106      4.2 3.4 e7.0 5.1 39    71    81    6.0 23      .14 .74
18 162      3.7 3.2 e26    4.2 22    40    34    4.8 8.6   .13 .30
19 43      3.6 3.0 e16    3.9 12    26    15    4.2 10      15      .15
20 19      3.3 2.9 e9.4 4.0 7.9 21    9.8 2.9 5.0   3.8   .72
 
21 11      3.1 2.9 e12    3.4 7.0 20    75    2.6 8.4   2.2   .38
22 7.0   3.0 2.5 e140    3.4 5.8 98    196    3.4 9.7   1.4   .28
23 5.2   2.8 2.4 225    3.2 5.5 175    73    3.8 3.7   1.9   .19
24 4.3   2.7 2.2 90    2.9 4.8 56    43    16    3.3   15      .14
25 4.1   2.8 e2.1 48    3.7 4.5 30    24    4.2 2.1   38      .11
 
26 3.2   2.7 e2.0 31    4.8 4.2 18    14    3.2 1.1   9.0   .12
27 11      2.5 e1.9 44    13    3.9 151    10    2.8 1.2   4.6   6.3  
28 8.8   2.9 e1.8 39    8.3 3.8 134    8.4 3.8 .80 2.9   78     
29 8.9   3.0 e1.7 24    ---    3.6 54    6.9 4.7 .34 2.0   40     
30 11      8.6 e2.2 17    ---    3.5 29    6.3 2.4 .75 .84 6.9  
 
31 5.6   ---    e2.1 14    ---    3.8 ---    12    ---    .70 .40 ---     

TOTAL 488.25 241.2 205.5 775.2 257.1 286.2 1602.1 958.4 419.7 125.19 117.28 146.81
MEAN 15.8 8.04 6.63 25.0 9.18 9.23 53.4 30.9 14.0 4.04 3.78 4.89
MAX 162 95 48 225 43 39 226 196 104 23 38 78
MIN .95 2.5 1.7 1.8 2.9 3.5 3.0 6.0 2.4 .17 .10 .09
CFSM 1.21 .62 .51 1.92 .71 .71 4.11 2.38 1.08 .31 .29 .38
IN. 1.40 .69 .59 2.22 .74 .82 4.58 2.74 1.20 .36 .34 .42

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 1999, BY WATER YEAR (WY)
MEAN 6.54 13.3 9.88 12.6 13.5 15.5 17.6 15.2 12.4 10.7 8.85 6.85
MAX 17.8 37.4 28.7 30.6 54.5 27.7 53.4 49.3 57.6 58.6 28.2 20.6
(WY) 1992 1991 1988 1993 1997 1990 1999 1990 1993 1996 1998 1989
MIN 1.11 2.94 1.03 2.78 2.08 3.83 5.30 1.25 1.02 .14 .50 .095
(WY) 1993 1998 1996 1987 1993 1996 1989 1992 1992 1991 1991 1995

SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1986 - 1999
ANNUAL TOTAL 6023.84 5622.93
ANNUAL MEAN 16.5   15.4   11.7  
HIGHEST ANNUAL MEAN 17.9   1993
LOWEST ANNUAL MEAN 7.58 1994
HIGHEST DAILY MEAN 481          Aug 4 226          Apr 9 1220      Jul 18 1996
LOWEST DAILY MEAN .08     Jul 31 .09     Sep 11 .00 A
ANNUAL SEVEN-DAY MINIMUM .39     Jul 28 .14     Sep 5 .00 Jul 24 1991
INSTANTANEOUS PEAK FLOW 576          Apr 9 3070      Jul 18 1996
INSTANTANEOUS PEAK STAGE 12.61     Apr 9 17.53 Jul 18 1996
INSTANTANEOUS LOW FLOW .09     Sep 9 - 12, 26
ANNUAL RUNOFF (CFSM) 1.27 1.19 .90
ANNUAL RUNOFF (INCHES) 17.24 16.09 12.23
10 PERCENT EXCEEDS 39      39      25     
50 PERCENT EXCEEDS 5.8   4.8   4.1  
90 PERCENT EXCEEDS 2.0   .39 .41
A - At times in most years.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data