Station list     Available data
ILLINOIS RIVER BASIN


415037088110600             BLACKWELL FOREST PRESERVE NEAR WARRENVILLE, IL



LOCATION.--Latitude 41°50'37", longitude 88°11'06", in SW1/4SW1/4SW1/4 sec.23, T.39 N., R.9 E., Du Page County.

PERIOD OF RECORD.--July 1997 to current year.

GAGE.--An 8-in.-diameter, unheated, tipping-bucket rain gage.

REMARKS.--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.

MAXIMUM FOR PERIOD OF RECORD.--Maximum, 2.68 in., July 3, 1998.

MAXIMUM FOR CURRENT YEAR.--Maximum, 2.33 in., October 17, 1998.
RAINFALL, IN INCHES, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 1.64 0.60 0.00 0.00
2 .52 .00 .00 .00 e.16 e.17 .00 .00 .04 .00 .00 .00
3 .00 .01 .00 .00 .00 .00 .00 .00 .00 .02 .00 .00
4 .01 .00 .00 .00 .00 .00 e.13 .03 .00 .00 .00 .00
5 .62 .00 .00 .00 e.05 .00 e.07 .03 .00 .00 .00 .00
6 .33 .00 .67 .00 .00 .00 .00 .43 .00 .00 .00 .00
7 .00 .00 .00 .00 .00 .00 .00 .03 .00 .00 e.30 .00
8 .00 .05 .00 .00 .00 .00 e1.23 .00 .00 .00 .00 .00
9 .00 e.26 .00 .00 .00 .00 e.26 .00 .00 .64 .00 .00
10 .00 e.90 .00 .00 .00 .00 e.09 .00 .11 .00 .00 .00
11 .00 .00 .01 .00 e.35 .00 .00 1.02 1.63 .00 .00 .00
12 .00 .00 .00 .00 .00 .00 .00 .48 .07 .00 .44 .36
13 .00 .00 .00 .00 .00 .00 .00 .00 1.13 .00 .04 .01
14 .02 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00
15 .04 .00 .00 .00 .00 .00 e.80 .01 .00 .00 .00 .00
16 .03 .00 .00 e.16 e.07 .00 e.44 .00 .00 .00 .00 .00
17 2.33 .00 .00 e.67 .00 .00 .00 .69 .00 .09 .01 .00
18 .21 .00 .00 .00 .00 .00 e.03 .00 .00 .00 .09 .00
19 .00 .00 .00 .00 .00 .00 .00 .00 .00 .09 .40 .11
20 .00 .00 .00 .00 .00 .00 e.11 .00 .00 1.03 .00 .00
21 .00 .00 .00 e.61 .00 .00 e.13 1.17 .00 .29 .00 .00
22 .00 .00 .00 e.54 .00 .00 e1.12 .01 .20 .01 .00 .00
23 .00 .00 .00 e.79 .00 .00 e.47 .09 .12 .50 .33 .00
24 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .04 .00
25 .00 .00 .00 .00 e.05 .00 .00 .00 .00 .00 .22 .00
26 .00 .00 .00 .00 e.24 .00 .00 .00 .00 .00 .00 .00
27 .49 .00 .00 .00 e.10 .00 e1.22 .00 .15 .00 .00 .42
28 .01 .00 .00 .00 e.04 .00 .00 .00 .07 .00 .00 1.68
29 .08 .00 s.01 .00 -- .00 .00 .00 .00 .00 .00 .05
30 .00 .36 .00 .00 -- .00 .00 .00 .00 .00 .00 .00
31 .00 -- .00 .00 -- .00 -- .01 -- .00 .00 --

TOTAL 4.69 1.59 0.71 2.77 1.06 0.17 6.10 4.00 5.16 3.28 1.87 2.63
s Snowfall-affected precipitation
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data