Station list     Available data
ILLINOIS RIVER BASIN


415131088143600       NATIONAL ACCELERATOR NEAR WEST CHICAGO, IL



LOCATION.-- Latitude 41°51'31", longitude 88°14'36", in NW1/4SW1/4SW1/4 sec.17, T.39 N., R.9 E., Du Page County, Hydrologic Unit 07120004, on McChesney Road 0.5 mi north of Eola Road, and at the National Accelerator Lab near West Chicago.

PERIOD OF RECORD.--
PRECIPITATION: April 1989 to October 1995 and July 1997 to current year.

GAGE.-- A 12-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.

EXTREMES FOR PERIOD OF RECORD.--
PRECIPITATION: Maximum, 3.62 in., June 23, 1994, but may have been greater during periods of missing record.

EXTREMES FOR CURRENT YEAR.--Maximum recorded, 2.68 in., April 20, 2000.

PRECIPITATION, TOTAL, INCHES, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY SUM VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 0.00 0.00 0.00 0.00 0.00 0.04 0.00 0.09 0.17 0.01 e0.14 0.00
2 .05 .00 .00 .02 .00 .00 .02 .00 .01 e.86 .00 .00
3 .87 .00 .37 .21 s.08 .00 .00 .00 .00 e.58 .00 .00
4 .01 .00 1.49 .00 s.01 .00 .01 .00 .06 .01 .00 .00
5 .00 .00 .72 .00 .00 .00 .00 .00 .51 .00 e.35 .00
6 .00 .00 .04 .01 .00 .00 .00 .00 .00 .00 e.68 .00
7 .00 .00 .01 .00 s.14 .00 .39 .02 .00 .00 .00 .00
8 .00 .00 .00 .04 s.01 .03 .09 .52 .00 .00 .00 .01
9 .00 .00 .06 .14 s.02 .00 .00 .66 .00 .00 .00 .00
10 .00 .00 .01 .10 .00 .00 .12 .01 .00 .88 .00 .00
11 .00 .00 .00 .00 .00 .00 .01 .50 1.09 .00 .00 2.29
12 .00 .00 .00 .00 .00 .00 .00 .02 .51 .00 .00 .02
13 .01 .00 .00 .00 .00 .03 .00 .00 .26 .00 .01 .00
14 .00 .00 .05 .00 s.05 .00 .00 .00 .14 .00 .00 .50
15 .00 .00 .16 .00 .00 .51 .00 .00 .00 .00 .00 .00
16 .15 .00 .00 .00 .00 .01 1.26 .24 .07 .00 .00 .00
17 .00 .00 .00 .00 .00 .00 .01 .07 .00 .00 .86 .00
18 .00 .00 s.06 .00 s.01 .00 .00 .31 .00 .00 .04 .00
19 .00 .03 s.04 .00 s.04 .17 .99 .00 .00 .00 .00 .00
20 .00 .00 .04 .00 .00 .28 2.68 .00 .58 .00 .00 .49
21 .00 .00 .00 .00 s.01 .01 .14 .00 .05 .00 .00 .00
22 .00 .03 .00 .00 .00 .00 .00 .15 .00 .00 .00 .69
23 .00 .45 .00 .00 .00 .00 .11 .00 .23 .00 .00 .13
24 .00 .00 .00 .00 .63 .12 .00 .00 e1.12 .00 .00 .18
25 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00
26 .00 .08 .00 .00 .07 .16 .00 .10 .00 .00 .00 .00
27 .00 .00 .00 .00 .00 .05 .00 .21 .01 .00 .00 .00
28 .00 .00 .00 .00 .00 .00 .00 .25 .02 .00 .00 .00
29 .00 .00 .00 .00 .00 .00 .00 .00 .00 e.01 .01 .00
30 .00 .00 .00 .00 -- .00 .00 .04 .01 e1.09 .00 .00
31 .00 -- .00 .00 -- .00 -- .77 -- e.70 .00 --

TOTAL 1.09 0.59 3.05 0.52 1.08 1.41 5.83 3.96 4.84 4.14 2.09 4.31
s Snowfall-affected precipitation
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data