Station list     Available data
ILLINOIS RIVER BASIN


05533400       SAWMILL CREEK NEAR LEMONT, IL



LOCATION.-- Lat 41°42'28", long 87°57'47", 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.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: December 1985 to current year.
 

STAGE: Water years 1994-2000.
 

PARTIAL RECORD: Annual maximum, water years 1961-79.
PRECIPITATION: April 1986 to current year.

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

GAGE.-- Water-stage recorder, phone telemeter, rain gage, 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.-- For precipitation records, snowfall-affected data can result during cold weather when snow fills the rain-gage funnel and then melts as temperatures rise. Snowfall-affected data are subject to appreciable errors.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,070 ft3/s, July 18, 1996, gage height, 17.53 ft; no flow at times in most years.
PRECIPITATION: Maximum, 6.17 in., July 17, 1996 but may have been greater during periods of missing record.

REMARKS FOR CURRENT YEAR.-- Records fair except those for 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 2.8   .39 .41 e1.7   e.68 4.8 2.1 9.5 65    4.1   10      .16
2 2.1   .34 .39 e1.9   e.70 4.0 2.1 6.3 32    3.4   8.0   .11
3 19      .41 2.0   2.4   e.72 3.7 2.3 4.4 16    82      3.7   .05
4 16      .50 11      4.7   e.73 3.5 2.0 4.1 12    24      2.3   .02
5 3.6   .33 99      3.1   e.73 3.4 1.8 3.5 22    11      8.6   .00
 
6 2.1   .31 26      2.5   e.73 3.4 1.8 3.1 11    7.2   25      .00
7 1.3   .38 7.2   2.1   e.74 3.2 4.1 2.9 6.9 5.0   23      .19
8 1.3   .47 4.6   2.0   e1.0   3.0 10    8.8 4.9 3.8   6.1   .03
9 1.1   .25 3.9   6.3   3.0   2.5 4.7 173    3.8 3.6   3.8   .00
10 .84 .07 3.7   11      6.8   2.1 3.4 72    3.6 134      3.1   26     
 
11 .66 .06 3.1   5.9   6.6   2.1 5.4 42    25    47      2.7   48     
12 .65 .12 2.7   3.8   4.5   1.9 3.6 29    114    21      2.0   115     
13 .52 .49 2.5   3.2   3.8   1.9 3.0 20    84    10      1.4   25     
14 .63 .26 2.4   2.7   3.4   1.9 2.7 10    52    7.1   2.0   25     
15 .60 .21 3.1   e2.4   3.2   2.2 2.7 6.8 36    5.5   1.4   10     
 
16 1.2   .09 3.8   e2.2   3.4   3.3 9.6 8.1 18    4.4   .90 5.7  
17 .92 .06 3.7   e2.0   3.5   2.3 40    6.2 11    3.3   45      4.2  
18 .58 .25 2.9   e1.8   3.6   2.0 9.2 24    6.9 2.8   11      3.2  
19 .54 .38 2.7   e1.6   5.2   3.7 37    34    5.4 2.7   4.4   2.8  
20 .44 .26 e2.3   e1.4   4.6   12    231    15    13    2.1   3.0   8.0  
 
21 .44 .03 e1.9   e1.2   8.9   6.3 144    9.9 14    1.9   2.1   5.8  
22 .34 .00 e1.7   e1.0   35      4.0 55    16    6.0 1.8   1.9   12     
23 .54 11      e1.5   e.90 30      3.3 36    8.9 4.4 1.2   9.3   18     
24 .57 5.2   e1.3   e.80 55      4.6 24    6.1 41    .39 3.0   21     
25 .42 1.1   e1.1   e.72 27      3.8 13    4.9 58    .17 2.0   8.6  
 
26 .36 .70 e1.0   e.68 14      3.0 8.8 4.0 20    .11 1.7   5.6  
27 .14 .62 e1.1   e.64 11      6.5 6.7 16    9.5 .08 1.4   4.1  
28 .59 .57 e1.2   e.66 6.5   3.6 5.6 216    7.4 .04 .81 3.3  
29 .52 .52 e1.3   e.70 5.3   2.9 5.0 48    7.3 .98 .49 3.2  
30 .60 .53 e1.4   e.70 ---      2.5 4.4 21    4.4 27      .31 3.1  
 
31 .42 ---      e1.5   e.69 ---      2.2 ---    78    ---    15      .30 ---     

TOTAL 61.82 25.90 202.40 73.39 250.33 109.6 681.0 911.5 714.5 432.67 190.71 358.16
MEAN 1.99 .86 6.53 2.37 8.63 3.54 22.7 29.4 23.8 14.0 6.15 11.9
MAX 19 11 99 11 55 12 231 216 114 134 45 115
MIN .14 .00 .39 .64 .68 1.9 1.8 2.9 3.6 .04 .30 .00
CFSM .15 .07 .50 .18 .66 .27 1.75 2.26 1.83 1.07 .47 .92
IN. .18 .07 .58 .21 .72 .31 1.95 2.61 2.04 1.24 .55 1.02

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2000, BY WATER YEAR (WY)
MEAN 6.21 12.4 9.64 11.9 13.1 14.7 17.9 16.1 13.2 11.0 8.67 7.19
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 .86 1.03 2.37 2.08 3.54 5.30 1.25 1.02 .14 .50 .095
(WY) 1993 2000 1996 2000 1993 2000 1989 1992 1992 1991 1991 1995

SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1986 - 2000
ANNUAL TOTAL 4978.10 4011.98
ANNUAL MEAN 13.6   11.0   11.6  
HIGHEST ANNUAL MEAN 17.9   1993
LOWEST ANNUAL MEAN 7.58 1994
HIGHEST DAILY MEAN 226          Apr 9 231          Apr 20 1220      Jul 18 1996
LOWEST DAILY MEAN .00     Nov 22 .00     A .00 B
ANNUAL SEVEN-DAY MINIMUM .14     Sep 5 .04     Sep 3 .00 Jul 24 1991
INSTANTANEOUS PEAK FLOW 655          May 28 3070      Jul 18 1996
INSTANTANEOUS PEAK STAGE 12.87     May 28 17.53 Jul 18 1996
ANNUAL RUNOFF (CFSM) 1.05 .84 .90
ANNUAL RUNOFF (INCHES) 14.25 11.48 12.17
10 PERCENT EXCEEDS 32      25      25     
50 PERCENT EXCEEDS 3.7   3.2   4.0  
90 PERCENT EXCEEDS .26 .39 .41
A - Nov. 22, Sept. 5, 6, 9.
B - At times in most years.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data