05537500 DATA: Discharge Tables, 2001

Station list Available data
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.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: July 1951 to current year.

STAGE: Water years 1994-2001.

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

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

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,310 ft³/s, July 18, 1996, from rating curve extended above 2,800 ft³/s, gage height, 11.10 ft; no flow at times in most years.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	3.6	3.2	7.3	e4.6	67	29	9.1	7.3	36	1.5	4.3	8.7
2	3.6	3.6	6.7	e4.7	e35	24	8.6	6.4	17	1.3	77	5.8
3	3.4	3.7	5.9	e4.8	e22	20	7.8	5.7	12	4.2	51	4.4
4	53	3.5	5.6	e4.9	e18	17	7.8	5.1	9.9	4.7	15	4.0
5	26	2.8	4.9	e4.9	e15	14	8.7	4.8	59	2.8	9.6	3.3

6	17	3.0	5.1	e4.9	e16	12	13	4.6	70	1.8	7.3	3.3
7	10	31	5.0	e4.8	e19	12	14	8.9	31	1.5	5.9	9.3
8	7.9	12	4.9	e4.8	88	17	9.9	6.4	18	1.6	4.8	5.6
9	6.5	49	5.1	e4.7	518	9.7	11	4.8	12	1.4	4.2	8.1
10	5.2	64	5.0	e4.7	255	8.8	10	4.8	9.7	1.2	5.8	9.2

11	4.2	28	e6.0	e4.6	112	10	10	8.1	8.0	.86	4.1	6.4
12	3.8	16	e7.5	e4.6	64	14	25	7.0	9.3	.59	3.2	4.1
13	3.4	31	e6.7	e5.0	51	19	15	5.4	8.6	.43	2.6	3.6
14	3.3	27	e6.3	31	59	16	15	4.9	6.9	.21	2.2	3.3
15	3.1	16	e6.0	61	59	27	57	4.8	8.5	.62	1.9	2.9

16	3.0	13	e5.7	49	45	64	52	4.8	6.7	.51	6.1	3.0
17	3.0	9.4	e5.3	35	34	67	31	5.4	5.2	1.4	4.8	3.0
18	2.9	7.3	e5.0	25	28	66	21	5.1	4.8	2.3	5.1	4.2
19	2.9	6.5	e4.8	19	20	52	17	4.6	4.3	1.4	7.0	64
20	3.1	6.0	e4.6	15	19	38	28	3.9	3.6	1.1	4.7	23

21	3.4	5.5	e4.5	e12	17	29	64	5.9	5.7	6.3	3.4	12
22	3.2	5.0	e4.4	e10	15	22	64	5.8	6.7	123	2.8	7.0
23	3.1	4.7	e4.3	e9.0	13	19	49	5.1	4.7	36	2.4	10
24	6.5	4.5	e4.2	e8.3	95	15	30	5.4	3.6	15	2.5	22
25	6.3	4.4	e4.1	e7.7	239	13	20	4.8	2.9	53	53	8.2

26	5.0	8.4	e4.0	e7.1	93	11	16	16	2.4	32	31	6.3
27	5.1	9.7	e4.0	e6.7	58	11	14	55	2.1	13	11	5.0
28	4.7	7.9	e4.0	e7.5	37	10	11	22	1.8	8.8	7.1	3.8
29	4.0	8.1	e4.1	e10	---	9.9	11	13	1.6	7.2	5.1	3.7
30	3.5	8.8	e4.2	129	---	9.5	8.3	10	1.8	5.9	4.5	3.2

31	3.5	---	e4.4	114	---	9.1	---	8.9	---	5.0	16	---

TOTAL	217.2	403.0	159.6	618.3	2111	695.0	658.2	264.7	373.8	336.62	365.4	260.4
MEAN	7.01	13.4	5.15	19.9	75.4	22.4	21.9	8.54	12.5	10.9	11.8	8.68
MAX	53	64	7.5	129	518	67	64	55	70	123	77	64
MIN	2.9	2.8	4.0	4.6	13	8.8	7.8	3.9	1.6	.21	1.9	2.9
CFSM	.34	.64	.25	.95	3.61	1.07	1.05	.41	.60	.52	.56	.42
IN.	.39	.72	.28	1.10	3.76	1.24	1.17	.47	.67	.60	.65	.46

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2001, BY WATER YEAR (WY)
MEAN	9.62	14.0	16.6	17.0	22.1	34.4	36.5	23.2	18.8	11.5	5.61	7.79
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 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1951 - 2001
ANNUAL TOTAL	7869.6		6463.22
ANNUAL MEAN	21.5		17.7		18.0
HIGHEST ANNUAL MEAN					39.9	1993
LOWEST ANNUAL MEAN					3.37	1963
HIGHEST DAILY MEAN	344	Apr 20	518	Feb 9	2190	Jul 18 1996
LOWEST DAILY MEAN	1.9	A	.21	Jul 14	.00	B
ANNUAL SEVEN-DAY MINIMUM	1.9	Jan 24	.63	Jul 10	.00	Aug 27 1953
MAXIMUM PEAK FLOW			635	Feb 9	5310 C	Jul 18 1996
MAXIMUM PEAK STAGE			6.43	Feb 9	11.10	Jul 18 1996
INSTANTANEOUS LOW FLOW			.13	Jul 14
ANNUAL RUNOFF (CFSM)	1.03		.85		.86
ANNUAL RUNOFF (INCHES)	14.01		11.50		11.72
10 PERCENT EXCEEDS	54		49		42
50 PERCENT EXCEEDS	6.5		7.0		5.2
90 PERCENT EXCEEDS	3.0		3.0		.10

	A- Jan. 25-28, estimated due to backwater from ice.
	B- At times in most years.
	C- From rating curve extended above 2,800 ft³/s.