05580950 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 40°28'16", long 89°01'48" (NAD of 1927), in NE1/4NW1/4 sec.7, T.23 N., R.2 E., McLean County, Hydrologic Unit 07130009, on left bank at Bloomington-Normal Sanitary District sewage-treatment plant, 250 ft upstream from bridge on Interstate 74, 0.4 mi west of Bloomington, and at mile 48.8.

DRAINAGE AREA.-- 34.4 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1974 to current year.
	STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WDR IL-82-2: Drainage area. WDR IL-87-2: 1985.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 725.11 ft above NGVD of 1929. Prior to Nov. 4, 1987, 200 ft upstream at same datum.

REMARKS.-- Sewage-treatment plant effluent 300 ft upstream contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,600 ft³/s, Dec. 3, 1982, gage height, 14.02 ft, from floodmark; minimum daily, 9.0 ft³/s, Dec. 25, 1976.

REMARKS FOR CURRENT YEAR.-- Records fair. Effluent from sewage-treatment plant upstream averaged 30.6 ft³/s and contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. The maximum monthly effluent was 38.2 ft³/s in July and the minimum was 26.5 ft³/s in December.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	20	17	19	25	50	24	32	46	24	40	33	465
2	19	15	20	26	42	23	32	35	27	34	143	128
3	20	16	19	27	61	23	32	32	42	32	98	77
4	67	16	18	24	38	26	222	108	27	29	44	59
5	24	43	19	27	33	35	106	102	24	28	34	49

6	18	21	19	26	28	33	69	65	55	27	33	41
7	17	18	19	26	26	52	252	61	31	29	31	38
8	17	17	18	27	25	58	110	47	37	230	28	38
9	18	16	18	25	23	39	82	93	30	945	25	36
10	17	17	18	24	25	30	68	237	63	1450	24	35

11	16	18	18	23	25	29	59	102	101	206	25	35
12	17	17	19	24	24	38	49	70	47	118	26	34
13	17	17	19	25	24	37	44	54	232	86	25	31
14	18	19	18	24	39	31	41	53	80	77	25	50
15	19	28	17	24	29	31	40	56	50	68	23	30

16	19	19	17	25	30	32	38	45	43	60	22	28
17	19	18	17	24	24	32	46	40	35	51	22	25
18	34	19	136	24	25	30	37	38	40	55	21	24
19	47	19	64	22	35	80	35	39	38	47	20	23
20	15	20	36	22	53	78	43	38	30	43	20	21

21	14	24	30	22	56	60	36	33	28	149	22	22
22	14	25	26	21	44	43	34	31	28	54	20	25
23	12	23	25	22	31	37	31	30	32	46	18	22
24	13	21	23	22	28	34	45	28	32	37	19	24
25	27	22	21	22	24	57	78	27	45	34	21	21

26	16	22	23	21	24	36	42	27	78	31	22	52
27	14	23	23	22	24	33	35	28	34	31	22	31
28	14	19	23	24	24	57	36	30	119	62	23	22
29	64	19	23	24	---	40	34	28	72	37	121	22
30	25	19	47	24	---	34	62	27	61	29	34	21

31	23	---	31	41	---	33	---	26	---	29	184	---

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2003, BY WATER YEAR (WY)
MEAN	35.8	44.7	50.4	40.1	58.2	78.7	70.6	75.5	55.6	45.6	44.3	40.8
MAX	152	203	201	130	148	238	146	181	118	135	138	178
(WY)	1987	1986	1983	1993	1976	1979	1979	1984	1993	2003	1981	1993
MIN	17.1	17.5	14.0	15.5	22.5	29.6	28.1	28.0	21.1	17.2	16.5	17.0
(WY)	1975	1977	1977	1977	1980	1981	1977	1987	1988	1994	1988	1998

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1975 - 2003
ANNUAL TOTAL	19770		17124
ANNUAL MEAN	54.2		46.9		53.3
HIGHEST ANNUAL MEAN					99.6	1993
LOWEST ANNUAL MEAN					31.7	2000
HIGHEST DAILY MEAN	656	Aug 23	1450	Jul 10	2500	Mar 4 1979
LOWEST DAILY MEAN	12	Oct 23	12	Oct 23	9.0	Dec 25 1976
ANNUAL SEVEN-DAY MINIMUM	15	Aug 6	16	Oct 21	11	Jul 31 2001
MAXIMUM PEAK FLOW			4380	Jul 10	6600	Dec 3 1982
MAXIMUM PEAK STAGE			12.60	Jul 10	14.02 A	Dec 3 1982
INSTANTANEOUS LOW FLOW			0.70	Oct 21
10 PERCENT EXCEEDS	106		69		96
50 PERCENT EXCEEDS	34		29		31
90 PERCENT EXCEEDS	18		18		18

	A - From flood mark.