LOCATION.-- Lat 38°11'39", long 89°53'17" (NAD of 1927), in SW1/4SW1/4 sec.9, T.4 S., R.7 W., Randolph County, Hydrologic Unit 07140204, at the river-intake pumphouse of Baldwin Power Station, near southwest corner of Baldwin Lake, about 2.5 mi northwest of Baldwin, about 6 mi southeast of Red Bud and at mi 19.3.

DRAINAGE AREA.-- 5,505 mi².

PERIOD OF RECORD.--

STAGE: Oct. 1994 to current year. Records of gage height for Nov. 1959 to Sept. 30, 1994, available in files of U.S. Army Corps of Engineers.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 300.00 ft above NGVD of 1929 (Levels by U.S. Army Corps of Engineers)(299.49 ft NAVD 1988).

EXTREMES FOR PERIOD OF RECORD.--

STAGE: Maximum gage height 91.90 ft, May 22, 1995; minimum, 67.36 ft, Mar. 5 and Apr. 7, 1996, but may have been lower during periods of missing record.

EXTREMES OUTSIDE PERIOD OF RECORD.--

STAGE: Maximum gage height, 94.36 ft, Aug. 6, 1993; minimum 50.8 ft, Oct. 16, 1964, from information by U.S. Army Corps of Engineers.

EXTREMES FOR CURRENT YEAR.-- Maximum gage height, 81.95 ft, Jan. 9; minimum, 68.21 ft, Mar. 31.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data