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, air temperature thermocouple, anemometer, 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, -3.77 ft., Nov. 6, 2000, exaggerated due to wave action.

EXTREMES FOR CURRENT YEAR.-- Maximum gage height, 1.96 ft, Jan. 26; minimum, -3.77 ft, Nov. 6, instantaneous annual extremes are exaggerated due to wave action.
GAGE HEIGHT, FEET, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 -1.87 -1.68 -1.65 -1.78 -2.26 -2.14 -1.68 -1.45 -.70 -.70 -.84 -.97
2 -1.48 -1.75 -1.81 -2.13 -2.26 -2.05 -1.64 -1.37 -.72 -.84 -.80 -1.03
3 -1.39 -1.82 -2.12 -2.34 -2.26 -1.91 -1.54 -1.19 -.76 -.79 -.75 -1.25
4 -1.31 -1.85 -2.62 -2.47 -2.01 -1.69 -1.62 -1.05 -.75 -.81 -.79 -.90
5 -1.19 -1.96 -2.23 -2.16 -2.14 -1.84 -1.59 -1.01 -.68 -.77 -.87 -1.04
 
6 -1.27 -1.59 -2.29 -2.11 -2.11 -2.09 -1.48 -1.04 -.62 -.89 -.99 -1.34
7 -1.27 -1.70 -1.97 -1.74 -2.09 -2.04 -2.00 -1.07 -.70 -.90 -.93 -1.70
8 -1.11 -1.72 -1.71 -1.46 -1.87 -1.95 -1.55 -1.30 -.78 -.80 -.94 -1.55
9 -1.38 -1.43 -2.31 -1.70 -1.87 -1.97 -1.40 -1.28 -.84 -.76 -.98 -.96
10 -1.48 -1.70 -2.13 -2.52 -2.24 -2.22 -1.26 -1.34 -.83 -.71 -.78 -1.13
 
11 -1.54 -1.67 -1.62 -2.17 -2.22 -1.86 -1.51 -1.08 -.69 -.79 -.86 -1.08
12 -1.63 -1.89 -1.77 -1.95 -2.21 -2.13 -1.97 -1.16 -.79 -.75 -.88 -1.12
13 -1.72 -1.72 -1.96 -1.99 -1.97 -1.88 -1.61 -1.21 -.69 -.79 -.74 -.90
14 -1.62 -1.92 -1.92 -1.91 -1.84 -2.04 -1.43 -1.31 -.73 -.81 -.93 -1.07
15 -1.25 -2.17 -2.19 -1.91 -1.93 -1.74 -1.44 -1.01 -.70 -.78 -1.08 -1.16
 
16 -1.25 -2.12 -1.84 -2.07 -1.90 -1.66 -1.36 -.89 -.76 -.71 -1.13 -1.10
17 -1.38 -1.84 -2.01 -2.11 -2.21 -1.66 -1.35 -1.01 -.76 -.64 -.97 -1.06
18 -1.56 -2.12 -2.07 -2.36 -2.36 -1.85 -1.45 -1.00 -.98 -.64 -1.00 -.94
19 -1.50 -2.22 -1.64 -1.97 -2.52 -1.79 -1.38 -1.04 -.89 -.66 -.53 -.89
20 -1.68 -1.83 -1.99 -2.10 -2.10 -1.68 -1.36 -.96 -.73 -.66 -.77 -.87
 
21 -1.36 -1.96 -2.06 -2.14 -2.10 -1.67 -1.56 -.95 -.58 -.75 -1.08 -.91
22 -1.30 -1.97 -2.05 -2.27 -2.16 -1.80 -1.26 -1.04 -.64 -.77 -1.05 -.96
23 -1.40 -1.89 -2.07 -2.31 -2.08 -1.85 -1.94 -1.19 -.69 -.82 -.74 -.55
24 -1.44 -1.98 -1.71 -2.02 -2.05 -1.88 -1.43 -.78 -.71 -.79 -.66 -.48
25 -1.48 -1.90 -1.97 -2.30 -2.35 -1.92 -1.40 -.86 -.67 -.56 -.95 -.74
 
26 -1.56 -1.56 -2.23 -2.54 -2.12 -1.86 -1.60 -.88 -.67 -.45 -.81 -.72
27 -1.37 -1.89 -1.92 -1.99 -1.97 -1.86 -1.18 -.71 -.69 -.74 -.94 -.67
28 -1.34 -1.90 -1.79 -2.15 -2.15 -1.96 -1.16 -.97 -.68 -.77 -.78 -.64
29 -1.71 -1.75 -1.67 -2.07 --- -1.66 -1.35 -.79 -.74 -.59 -.93 -.69
30 -1.80 -1.64 -1.35 -1.87 --- -1.60 -1.33 -.85 -.86 -.68 -1.19 -.82
 
31 -1.58 --- -1.74 -2.05 --- -1.71 --- -.96 --- -.74 -.85 ---

MEAN -1.46 -1.84 -1.95 -2.09 -2.12 -1.87 -1.49 -1.06 -.73 -.74 -.89 -.97
MAX -1.11 -1.43 -1.35 -1.46 -1.84 -1.60 -1.16 -.71 -.58 -.45 -.53 -.48
MIN -1.87 -2.22 -2.62 -2.54 -2.52 -2.22 -2.00 -1.45 -.98 -.90 -1.19 -1.70

CAL YR 2000 MEAN -1.38 MAX -.54 MIN -2.62
WTR YR 2001 MEAN -1.43 MAX -.45 MIN -2.62


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data