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LAKE COUNTY


SITE ID.--422803087475303. Local number, 46N12E-14.6g3.

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.--Elmhurst Sandstone member of the Eau Claire Formation and the upper Mount Simon Sandstone of Cambrian age.

WELL CHARACTERISTICS.--Drilled unused artesian well, one of three piezometers in 10-in. borehole, diameter 1.25 in., depth 1,684 ft, cased to 1,666 ft, 2-in. screen.

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, 2.67 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, 209.18 ft below land-surface datum, May 25, 1999; lowest, 232.7 ft below land-surface datum, Oct. 18, Nov. 12, 18, 19, 28, 29, 1989.
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 13 208.58 JAN 28 208.42 MAR 24 207.48 MAY 25 207.18 JUN 25 207.61 AUG 18 209.01


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data