LOCATION.-- Lat 41°39'09", long 87°50'23" (NAD of 1927), in NW1/4SE1/4 sec. 34, T. 37 N., R. 12 E., Cook County, Hydrologic Unit 07120003, at culvert on 131st Street, 1 mi south of Palos Park.

DRAINAGE AREA.-- 6.39 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

PARTIAL RECORD: Annual maximum, water years 1961 to 1977.

GAGE.-- Crest-stage gage. Datum is 665.66 ft above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 330 ft³/sec, May 12, 1966, gage height, 2.13 ft.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data