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
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
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