05537500 DATA: Discharge Tables, 1999

ILLINOIS RIVER BASIN

05537500 LONG RUN NEAR LEMONT, IL

LOCATION.--Lat 41°38'33", long 87°59'57", in SW1/4SE1/4 sec.32, T.37 N., R.11 E., Cook County, Hydrologic Unit 07120004, on left bank at downstream side of bridge on State Street, 2 mi south of Lemont, and at mile 5.4.

DRAINAGE AREA.--20.9 mi².

PERIOD OF RECORD.--July 1951 to current year.

REVISED RECORDS.--WSP 1338: 1952(M). WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 637.20 ft above sea level.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	7.3	9.2	5.6	e2.6	35	12	6.2	44	33	19	2.6	3.2
2	4.6	8.5	3.8	e2.4	56	11	5.9	31	261	13	2.0	2.9
3	13	8.8	3.3	e3.0	52	15	5.6	23	98	8.7	1.9	2.6
4	6.7	6.2	3.1	e3.6	37	12	7.3	18	46	6.9	1.8	2.3
5	4.4	4.2	3.0	e3.3	28	11	7.3	17	28	5.4	1.6	2.2

6	5.4	3.9	21	e3.1	26	22	8.1	21	19	4.9	1.4	2.1
7	5.8	3.2	109	e2.9	22	19	6.1	20	14	4.2	1.4	2.1
8	3.8	3.2	39	e2.8	19	17	11	14	10	3.8	1.6	2.1
9	2.9	3.4	21	e2.7	17	18	213	12	11	3.5	1.6	2.0
10	2.4	75	14	e2.6	15	18	86	10	9.5	3.3	1.6	1.9

11	2.1	57	11	e2.6	15	17	51	12	23	3.0	1.7	2.0
12	1.9	25	9.2	e2.5	18	17	35	46	49	2.7	2.2	2.3
13	2.3	16	8.2	e2.5	13	21	25	36	118	2.9	4.2	3.8
14	2.1	13	7.2	e2.4	11	20	19	18	86	2.4	3.0	3.1
15	1.9	10	6.3	e2.4	11	22	52	14	33	2.3	2.3	2.7

16	2.3	8.5	5.8	e3.0	11	48	299	11	20	2.1	1.8	2.1
17	13	7.1	5.1	e7.0	11	95	172	63	15	15	1.7	1.4
18	85	5.8	4.9	e40	9.3	61	87	31	11	15	1.5	1.4
19	31	5.4	4.4	47	9.0	35	55	18	8.8	6.9	6.2	1.6
20	13	4.7	3.9	42	8.0	26	38	13	8.0	5.1	4.1	2.1

21	8.9	4.1	e3.8	42	7.7	20	36	35	7.1	5.4	2.7	1.9
22	6.6	3.7	e3.9	430	7.4	16	73	215	20	18	2.1	2.0
23	5.2	3.5	e3.4	496	7.0	13	235	98	33	9.2	2.3	1.8
24	4.5	3.1	e3.0	255	6.6	11	115	70	60	21	25	2.4
25	4.0	3.0	e2.8	127	7.1	9.7	63	36	36	8.4	61	2.5

26	3.5	3.0	e2.7	76	7.7	9.2	39	23	21	5.2	23	2.3
27	4.1	2.8	e2.6	82	14	8.7	233	17	42	4.0	12	4.7
28	15	2.5	e2.5	91	14	7.8	342	13	26	3.2	7.5	28
29	8.6	2.6	e2.4	53	---	7.4	142	10	20	2.8	5.5	27
30	20	3.7	e3.1	40	---	6.7	69	8.5	12	2.9	4.3	8.5

31	13	---	e2.8	35	---	6.1	---	13	---	2.2	3.7	---

TOTAL	304.3	310.1	321.8	1907.4	494.8	632.6	2536.5	1010.5	1178.4	212.4	195.3	127.0
MEAN	9.82	10.3	10.4	61.5	17.7	20.4	84.6	32.6	39.3	6.85	6.30	4.23
MAX	85	75	109	496	56	95	342	215	261	21	61	28
MIN	1.9	2.5	2.4	2.4	6.6	6.1	5.6	8.5	7.1	2.1	1.4	1.4
CFSM	.47	.49	.50	2.94	.85	.98	4.05	1.56	1.88	.33	.30	.20
IN.	.54	.55	.57	3.39	.88	1.13	4.51	1.80	2.10	.38	.35	.23

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1999, BY WATER YEAR (WY)
MEAN	9.83	14.3	16.9	17.2	21.2	35.2	36.6	23.1	17.8	11.2	5.37	7.76
MAX	163	71.9	92.2	75.5	104	131	86.9	74.5	89.6	126	27.4	74.9
(WY)	1955	1986	1983	1993	1997	1979	1975	1966	1993	1996	1972	1961
MIN	.000	.006	.016	.020	.028	2.19	1.69	2.83	.73	.048	.000	.000
(WY)	1965	1972	1964	1977	1964	1964	1963	1958	1988	1961	1964	1963

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1951 - 1999
ANNUAL TOTAL	9171.3		9231.1
ANNUAL MEAN	25.1		25.3		18.0
HIGHEST ANNUAL MEAN					39.9	1993
LOWEST ANNUAL MEAN					3.37	1963
HIGHEST DAILY MEAN	611	May 7	496	Jan 23	2190	Jul 18 1996
LOWEST DAILY MEAN	1.3	Jul 31-Aug 2	1.4	A	.00	B
ANNUAL SEVEN-DAY MINIMUM	1.4	Jul 28	1.6	Aug 5	.00	Aug 27 1953
INSTANTANEOUS PEAK FLOW			604	Jan 23	5310 C	Jul 18 1996
INSTANTANEOUS PEAK STAGE			6.33	Jan 23	11.10	Jul 18 1996
INSTANTANEOUS LOW FLOW			1.3	Sep 17, 18
ANNUAL RUNOFF (CFSM)	1.20		1.21		.86
ANNUAL RUNOFF (INCHES)	16.32		16.43		11.69
10 PERCENT EXCEEDS	59		56		42
50 PERCENT EXCEEDS	9.2		8.5		5.1
90 PERCENT EXCEEDS	2.4		2.3		.10

A - Aug. 6-7, Sept. 17-18.
B - At times in most years.
C - From rating curve extended above 2,800 ft³/s.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data