05551700 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 41°40'18", long 88°26'29" (NAD of 1927), in SE1/4NW1/4 sec.21, T.37 N., R.7 E., Kendall County, Hydrologic Unit 07120007, on right bank 300 ft upstream from bridge on State Highway 47, 2.0 mi north of Yorkville, and at mile 3.3.

DRAINAGE AREA.-- 70.2 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1960 to current year.
	STAGE: Water years 1994-2002.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 612.34 ft above NGVD of 1929.

REMARKS.-- Diversion about 7 miles upstream near Jericho Rd. that crosses the watershed divide during overbank flow.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE -WATER DISCHARGE AND STAGE: Maximum discharge, 5,510 ft³/s, from rating curve extended above 3,900 ft³/s, July 18, 1996, gage height, 13.16 ft, backwater from debris jam; minimum, 0.10 ft³/s, Dec. 7, 1962, result of freeze up.

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

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	19	63	55	e23	33	55	58	90	60	37	15	12
2	18	59	52	e23	30	e50	62	85	57	35	13	11
3	17	54	49	e23	29	e44	61	80	62	32	12	10
4	17	51	47	e24	27	e40	58	73	129	30	12	10
5	76	47	44	e24	e26	e44	55	68	319	29	22	9.3

6	84	45	41	e23	e26	e50	53	65	489	26	23	8.9
7	59	45	38	e23	e25	57	53	66	340	26	18	8.4
8	46	45	35	e24	25	81	77	61	187	26	16	8.8
9	39	41	33	e25	25	169	159	64	153	33	14	8.3
10	35	41	31	e26	39	211	190	64	141	69	12	7.4

11	39	38	30	e25	60	159	153	82	135	56	11	7.4
12	50	36	30	25	60	133	127	240	122	42	10	7.4
13	127	35	44	25	58	117	108	380	117	35	11	7.4
14	334	38	60	25	56	104	93	329	110	30	80	7.2
15	392	42	56	24	53	92	84	194	98	27	104	7.7

16	239	41	51	28	51	83	75	156	86	24	55	7.8
17	171	36	50	22	48	76	69	197	80	22	35	7.5
18	136	33	51	21	45	72	64	185	89	22	26	8.5
19	116	34	68	28	47	67	61	147	76	23	21	9.2
20	98	35	66	24	81	65	82	126	69	22	18	13

21	86	32	54	23	128	61	89	113	65	21	15	13
22	75	31	52	24	120	56	92	101	61	18	22	13
23	150	29	52	24	95	55	90	92	57	17	106	14
24	236	34	48	27	81	54	83	88	55	15	83	13
25	284	45	40	26	74	53	82	82	52	15	50	11

26	233	49	e37	24	68	51	76	82	50	15	36	11
27	123	46	e34	24	62	50	76	76	48	17	28	9.0
28	97	43	e31	23	64	48	108	75	45	18	22	9.8
29	83	41	e29	25	---	53	116	72	41	19	19	8.6
30	73	47	e26	24	---	64	101	69	40	20	16	7.5

31	70	---	e24	37	---	61	---	63	---	17	14	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 2002, BY WATER YEAR (WY)
MEAN	31.44	42.46	46.60	44.21	63.11	86.02	89.01	76.82	64.76	46.51	28.68	31.70
MAX	126	175	217	146	202	360	249	221	197	381	172	131
(WY)	1973	1986	1983	1993	1997	1979	1979	1974	1974	1996	1987	1987
MIN	5.42	7.44	4.16	4.25	5.46	22.9	27.2	16.7	14.3	8.43	4.21	5.23
(WY)	1964	1964	1964	1977	1963	1964	1963	1989	1977	1961	1991	1976

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1961 - 2002
ANNUAL TOTAL	21638.8		22730.1
ANNUAL MEAN	59.28		62.27		54.18
HIGHEST ANNUAL MEAN					97.8	1993
LOWEST ANNUAL MEAN					16.7	1977
HIGHEST DAILY MEAN	542	Feb 11	489	Jun 6	3460	Jul 19 1996
LOWEST DAILY MEAN	3.6 A	Aug 14	7.2	Sep 14	1.6	Aug 2 1991
ANNUAL SEVEN-DAY MINIMUM	4.4	Aug 9	7.5	Sep 10	2.1	Jul 31 1991
MAXIMUM PEAK FLOW			562	Jun 6	5510 B	Jul 18 1996
MAXIMUM PEAK STAGE			7.40	Jun 6	13.16 C	Jul 18 1996
INSTANTANEOUS LOW FLOW			4.0 D	Feb 4	0.10 D	Dec 7 1962
ANNUAL RUNOFF (CFSM)	0.84		0.89		0.77
ANNUAL RUNOFF (INCHES)	11.47		12.05		10.49
10 PERCENT EXCEEDS	121		124		110
50 PERCENT EXCEEDS	39		47		31
90 PERCENT EXCEEDS	7.8		14		10

	A - May have been less during period of missing record Aug. 6-13.
	B - From rating curve extended above 3,900 ft³/s.
	C - Backwater from debris jam.
	D - Result of freeze up.

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	19	63	55	e23	33	55	58	90	60	37	15	12
2	18	59	52	e23	30	e50	62	85	57	35	13	11
3	17	54	49	e23	29	e44	61	80	62	32	12	10
4	17	51	47	e24	27	e40	58	73	129	30	12	10
5	76	47	44	e24	e26	e44	55	68	319	29	22	9.3

6	84	45	41	e23	e26	e50	53	65	489	26	23	8.9
7	59	45	38	e23	e25	57	53	66	340	26	18	8.4
8	46	45	35	e24	25	81	77	61	187	26	16	8.8
9	39	41	33	e25	25	169	159	64	153	33	14	8.3
10	35	41	31	e26	39	211	190	64	141	69	12	7.4

11	39	38	30	e25	60	159	153	82	135	56	11	7.4
12	50	36	30	25	60	133	127	240	122	42	10	7.4
13	127	35	44	25	58	117	108	380	117	35	11	7.4
14	334	38	60	25	56	104	93	329	110	30	80	7.2
15	392	42	56	24	53	92	84	194	98	27	104	7.7

16	239	41	51	28	51	83	75	156	86	24	55	7.8
17	171	36	50	22	48	76	69	197	80	22	35	7.5
18	136	33	51	21	45	72	64	185	89	22	26	8.5
19	116	34	68	28	47	67	61	147	76	23	21	9.2
20	98	35	66	24	81	65	82	126	69	22	18	13

21	86	32	54	23	128	61	89	113	65	21	15	13
22	75	31	52	24	120	56	92	101	61	18	22	13
23	150	29	52	24	95	55	90	92	57	17	106	14
24	236	34	48	27	81	54	83	88	55	15	83	13
25	284	45	40	26	74	53	82	82	52	15	50	11

26	233	49	e37	24	68	51	76	82	50	15	36	11
27	123	46	e34	24	62	50	76	76	48	17	28	9.0
28	97	43	e31	23	64	48	108	75	45	18	22	9.8
29	83	41	e29	25	---	53	116	72	41	19	19	8.6
30	73	47	e26	24	---	64	101	69	40	20	16	7.5

31	70	---	e24	37	---	61	---	63	---	17	14	---

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	19	63	55	e23	33	55	58	90	60	37	15	12
2	18	59	52	e23	30	e50	62	85	57	35	13	11
3	17	54	49	e23	29	e44	61	80	62	32	12	10
4	17	51	47	e24	27	e40	58	73	129	30	12	10
5	76	47	44	e24	e26	e44	55	68	319	29	22	9.3

6	84	45	41	e23	e26	e50	53	65	489	26	23	8.9
7	59	45	38	e23	e25	57	53	66	340	26	18	8.4
8	46	45	35	e24	25	81	77	61	187	26	16	8.8
9	39	41	33	e25	25	169	159	64	153	33	14	8.3
10	35	41	31	e26	39	211	190	64	141	69	12	7.4

11	39	38	30	e25	60	159	153	82	135	56	11	7.4
12	50	36	30	25	60	133	127	240	122	42	10	7.4
13	127	35	44	25	58	117	108	380	117	35	11	7.4
14	334	38	60	25	56	104	93	329	110	30	80	7.2
15	392	42	56	24	53	92	84	194	98	27	104	7.7

16	239	41	51	28	51	83	75	156	86	24	55	7.8
17	171	36	50	22	48	76	69	197	80	22	35	7.5
18	136	33	51	21	45	72	64	185	89	22	26	8.5
19	116	34	68	28	47	67	61	147	76	23	21	9.2
20	98	35	66	24	81	65	82	126	69	22	18	13

21	86	32	54	23	128	61	89	113	65	21	15	13
22	75	31	52	24	120	56	92	101	61	18	22	13
23	150	29	52	24	95	55	90	92	57	17	106	14
24	236	34	48	27	81	54	83	88	55	15	83	13
25	284	45	40	26	74	53	82	82	52	15	50	11

26	233	49	e37	24	68	51	76	82	50	15	36	11
27	123	46	e34	24	62	50	76	76	48	17	28	9.0
28	97	43	e31	23	64	48	108	75	45	18	22	9.8
29	83	41	e29	25	---	53	116	72	41	19	19	8.6
30	73	47	e26	24	---	64	101	69	40	20	16	7.5

31	70	---	e24	37	---	61	---	63	---	17	14	---

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	19	63	55	e23	33	55	58	90	60	37	15	12
2	18	59	52	e23	30	e50	62	85	57	35	13	11
3	17	54	49	e23	29	e44	61	80	62	32	12	10
4	17	51	47	e24	27	e40	58	73	129	30	12	10
5	76	47	44	e24	e26	e44	55	68	319	29	22	9.3

6	84	45	41	e23	e26	e50	53	65	489	26	23	8.9
7	59	45	38	e23	e25	57	53	66	340	26	18	8.4
8	46	45	35	e24	25	81	77	61	187	26	16	8.8
9	39	41	33	e25	25	169	159	64	153	33	14	8.3
10	35	41	31	e26	39	211	190	64	141	69	12	7.4

11	39	38	30	e25	60	159	153	82	135	56	11	7.4
12	50	36	30	25	60	133	127	240	122	42	10	7.4
13	127	35	44	25	58	117	108	380	117	35	11	7.4
14	334	38	60	25	56	104	93	329	110	30	80	7.2
15	392	42	56	24	53	92	84	194	98	27	104	7.7

16	239	41	51	28	51	83	75	156	86	24	55	7.8
17	171	36	50	22	48	76	69	197	80	22	35	7.5
18	136	33	51	21	45	72	64	185	89	22	26	8.5
19	116	34	68	28	47	67	61	147	76	23	21	9.2
20	98	35	66	24	81	65	82	126	69	22	18	13

21	86	32	54	23	128	61	89	113	65	21	15	13
22	75	31	52	24	120	56	92	101	61	18	22	13
23	150	29	52	24	95	55	90	92	57	17	106	14
24	236	34	48	27	81	54	83	88	55	15	83	13
25	284	45	40	26	74	53	82	82	52	15	50	11

26	233	49	e37	24	68	51	76	82	50	15	36	11
27	123	46	e34	24	62	50	76	76	48	17	28	9.0
28	97	43	e31	23	64	48	108	75	45	18	22	9.8
29	83	41	e29	25	---	53	116	72	41	19	19	8.6
30	73	47	e26	24	---	64	101	69	40	20	16	7.5

31	70	---	e24	37	---	61	---	63	---	17	14	---