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LAKE COUNTY


SITE ID.--422803087475301. Local number, 46N12E-14.6g1.

LOCATION.--Lat 42°28'03", long 87°47'53", Hydrologic Unit 04040002, at Illinois Beach State Park, northern unit. Owner: U.S. Geological Survey.

AQUIFER.--Galena, Platteville, and Ancell Groups of Ordovician age.

WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 10 in., depth 940 ft, cased to 589 ft, unscreened.

INSTRUMENTATION.--Manual steel-tape measurement made every 2 months.

DATUM.--Land-surface datum is 586 ft above sea level. Measuring point: Top coupling on 1.25-in. plastic pipe, 2.73 ft above land-surface datum.

REMARKS.--Water level affected by regional pumping.

PERIOD OF RECORD.--November 1988 to September 1997, December 1998 to current year. Miscellaneous water-level measurements from December 1981 to November 1988 are available in files of the U.S. Geological Survey.

EXTREMES FOR PERIOD OF RECORD.--Highest water level, 209.20 ft below land-surface datum, July 2, 1997; lowest, 235.35 ft below land-surface datum, Oct. 30, 1990.
WATER LEVELS IN FEET BELOW LAND SURFACE DATUM,
WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
WATER WATER WATER WATER WATER WATER
LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL
DEC 13 211.56 JAN 28 210.81 MAR 24 210.00 MAY 25 209.40 JUN 25 209.99 AUG 18 213.31


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data