Station list     Available data
ST. LAWRENCE RIVER BASIN


04087440       LAKE MICHIGAN AT CHICAGO LOCK AT CHICAGO, IL



LOCATION.-- Lat 41°53'18", long 87°36'27", in NE1/4 SE1/4 sec.10, T.39 N., R.14 E., Cook County, Hydrologic Unit 04060200, on the lakeside of the downstream left guidewall, approximately 75 ft west of the riverside gates of the Chicago Lock.

DRAINAGE AREA.-- Indeterminate.

PERIOD OF RECORD.--
STAGE: August 1997 to current year.

GAGE.-- Water-stage recorder, phone telemeter, and rain gage. Datum of gage is 579.48 ft above sea level (Chicago City Datum).

REMARKS.-- Gage provides stage data to determine Illinois' diversion of Lake Michigan water.

EXTREMES FOR PERIOD OF RECORD.--
STAGE: Maximum gage height, 3.84 ft, May 31, 1998; minimum, -3.68 ft., Apr. 05, 2000.

EXTREMES FOR CURRENT YEAR.-- Maximum gage height, 0.70 ft, Dec. 26 and June 1; minimum, -3.68 ft, Apr. 5.
GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 -.94 --- -2.32 -1.70 -1.72 -1.43 -1.59 -1.39 -1.02 -1.11 -.68 -.85
2 -.66 -.93 -1.68 -1.54 -2.06 -1.59 -1.58 -1.38 -1.00 -1.02 -.62 -.74
3 -1.21 -1.19 -1.51 -1.29 -1.57 -1.59 -1.48 -1.33 -1.06 -.65 -.70 -.82
4 -.73 -1.49 -1.22 -1.28 -1.35 -1.58 -1.62 -1.51 -.91 -.77 -.82 -.54
5 -.91 -1.33 -.95 -2.15 -1.80 -1.43 -2.21 -1.52 -.79 -.69 -1.23 -.88
 
6 -.78 -1.18 -1.28 -2.20 -1.89 -1.31 -1.64 -1.64 -1.05 -.58 -.89 -1.08
7 -1.91 -1.10 -1.97 -2.07 -1.67 -1.43 -1.19 -1.53 -1.12 -.75 -.96 -1.13
8 -1.40 -1.25 -1.45 -2.25 -1.95 -1.73 -1.36 -1.56 -1.17 -.93 -.92 -1.04
9 -.74 -1.40 -1.28 -1.65 -1.77 -1.17 -1.60 -1.22 -1.09 -.95 -.82 -1.09
10 -.68 -.97 -1.20 -1.71 -1.26 -1.17 -1.69 -1.45 -1.12 -.75 -.90 -1.16
 
11 -.92 -.82 -1.51 -1.93 -1.35 -1.20 -1.46 -1.62 -.88 -.61 -.77 -1.32
12 -1.78 -1.13 -1.31 -1.81 -1.68 -1.48 -1.55 -1.18 -.71 -.77 -.90 -1.13
13 -.86 -1.28 -1.25 -1.47 -1.35 -1.52 -1.70 -1.53 -.77 -.84 -.97 -1.28
14 -1.58 -1.26 -1.19 -1.95 -1.41 -1.52 -1.71 -1.51 -1.02 -.83 -.91 -1.00
15 -2.11 -1.28 -1.20 -2.01 -2.01 -1.22 -1.44 -1.39 -1.10 -.77 -.93 -.92
 
16 -1.02 -1.07 -1.46 -1.65 -1.53 -1.26 -1.18 -1.29 -1.17 -.76 -.93 -1.15
17 -.89 -1.48 -1.41 -1.90 -1.68 -1.34 -1.07 -1.12 -.94 -.82 -1.03 -1.36
18 -.68 -1.77 -1.34 -1.67 -1.44 -1.78 -1.43 -.85 -.96 -.80 -.77 -1.32
19 -.87 -1.69 -1.51 -1.77 -1.65 -1.18 -1.50 -.82 -1.04 -.69 -.93 -1.52
20 -.90 -1.29 -1.74 -1.71 -1.78 -1.03 -1.05 -1.05 -1.20 -.83 -.95 -1.34
 
21 -1.51 -1.38 -1.76 -1.44 -1.95 -1.22 -.91 -1.14 -1.09 -.81 -1.20 -1.47
22 -1.00 -1.25 -1.66 -1.87 -1.75 -1.43 -1.35 -1.10 -1.13 -.73 -1.03 -1.62
23 -1.33 -1.64 -1.70 -1.84 -1.65 -1.40 -1.34 -1.05 -.92 -.75 -.91 -.89
24 --- -1.36 -1.44 -2.09 -1.55 -1.37 -1.23 -1.20 -.81 -.80 -.95 -1.06
25 --- -1.39 -2.22 -1.50 -1.62 -1.58 -1.28 -1.27 -.96 -.87 -1.06 -1.07
 
26 --- -1.31 -1.67 -1.35 -2.01 -1.98 -1.39 -1.08 -.94 -.91 -1.06 -1.37
27 --- -1.34 -1.67 -1.45 -1.65 -1.79 -1.35 -.83 -.97 -.83 -.79 -1.16
28 --- -1.55 -1.68 -1.64 -1.64 -1.46 -1.32 -.76 -.94 -.70 -.98 -1.22
29 --- -1.28 -2.05 -1.48 -1.91 -1.76 -1.28 -.98 -.93 -.63 -.89 -1.62
30 --- -1.27 -1.67 -1.45 --- -1.69 -1.40 -1.13 -1.03 -.58 -.86 -1.76
 
31 --- --- -1.71 -1.75 --- -1.67 --- -1.02 --- -.58 -1.01 ---

MEAN --- --- -1.55 -1.73 -1.68 -1.46 -1.43 -1.24 -.99 -.78 -.92 -1.16
MAX --- --- -.95 -1.28 -1.26 -1.03 -.91 -.76 -.71 -.58 -.62 -.54
MIN --- --- -2.32 -2.25 -2.06 -1.98 -2.21 -1.64 -1.20 -1.11 -1.23 -1.76


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data