USGS CD-ROM: Current Year Discharge

05590800 LAKE FORK AT ATWOOD, IL

LOCATION.--Lat 39°48'30", long 88°28'34", in NE¼NW¼ sec.36, T.16 N., R.6 E., Piatt County, Hydrologic Unit 07140201, on left bank at downstream side of bridge, 0.9 mi northwest of Atwood and at mile 9.0.

DRAINAGE AREA.--149 mi².

PERIOD OF RECORD.--October 1972 to current year.

REVISED RECORDS.--WDR IL-93-1: 1989(M), 1990-92. WDR IL-94-1: 1989.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 644.58 ft above sea level.

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

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	e.56	e1.3	e27	e19	101	141	503	631	180	355	30	1.5
2	e.53	e1.2	e18	e17	93	134	408	618	161	230	21	.80
3	e.50	e1.1	e13	e18	77	127	359	1260	137	174	17	.74
4	e.48	e1.0	e8.0	e25	75	114	849	1880	124	146	15	.64
5	e.46	e.95	e5.0	e50	76	98	721	1190	121	119	13	.47

6	e.44	e1.8	e3.5	180	70	91	538	809	105	104	13	.39
7	e.42	e4.0	e2.5	185	64	90	432	887	93	220	18	e.35
8	e.40	e3.5	e2.0	541	61	187	687	1140	88	464	37	e.25
9	e.40	e2.7	e1.7	794	58	556	530	844	229	272	25	e.22
10	e1.5	e2.1	e4.5	572	57	517	369	618	313	170	18	e.20

11	e1.2	e1.8	e10	394	77	356	280	457	258	122	15	e.17
12	e1.0	e1.6	e8.0	293	131	255	233	349	1130	94	11	e.14
13	e1.4	e1.4	e6.5	221	121	219	218	359	1220	77	9.0	e.11
14	e2.2	e1.3	e7.0	176	105	243	216	352	803	65	e7.0	e.09
15	e1.5	e2.8	e5.5	168	94	237	189	267	1440	56	e6.0	e.07

16	e1.2	3.3	e5.0	141	100	215	183	220	1450	50	e6.5	e.05
17	e1.0	2.9	e4.5	123	183	377	146	176	1240	43	e5.0	e.03
18	e.90	2.5	e4.0	103	393	911	124	155	769	39	e4.0	e.02
19	e.79	2.3	e3.5	89	349	752	121	147	1190	35	e3.7	e.01
20	e.68	e2.0	e3.0	82	290	977	114	286	848	33	e3.5	e.00

21	e.59	e1.8	e3.8	80	249	1310	112	272	569	31	e3.1	e.20
22	e.52	e1.6	e5.0	76	220	955	104	230	462	28	e2.6	e.35
23	e.47	e1.4	e7.0	73	199	709	96	983	1030	68	e2.1	e.26
24	e.43	e1.2	17	67	172	559	92	1490	757	49	e1.7	e.20
25	e.40	e1.1	88	62	148	443	90	1420	506	33	e1.4	e.13

26	e1.2	e1.0	81	62	146	354	91	841	357	26	e1.1	e.30
27	e3.5	e1.1	52	67	164	290	76	586	276	22	e.80	e.22
28	e2.2	e2.2	38	107	151	938	69	419	217	20	e.60	e.18
29	e1.7	e3.5	32	132	---	1160	118	313	207	17	e.45	e.13
30	e1.3	e16	e26	118	---	775	494	248	492	45	e.30	e.08

31	e1.1	---	e22	103	---	578	---	217	---	57	e.70	---

TOTAL	30.97	72.45	514.0	5138	4024	14668	8562	19664	16772	3264	292.55	8.30
MEAN	1.00	2.41	16.6	166	144	473	285	634	559	105	9.44	.28
MAX	3.5	16	88	794	393	1310	849	1880	1450	464	37	1.5
MIN	.40	.95	1.7	17	57	90	69	147	88	17	.30	.00
CFSM	.01	.02	.11	1.11	.96	3.18	1.92	4.26	3.75	.71	.06	.00
IN.	.01	.02	.13	1.28	1.00	3.66	2.14	4.91	4.19	.81	.07	.00

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1973 - 1998, BY WATER YEAR (WY)
MEAN	52.7	111	162	132	199	273	245	276	180	90.4	64.6	25.4
MAX	371	592	452	573	595	957	703	772	738	358	394	272
(WY)	1994	1993	1988	1993	1982	1979	1994	1996	1974	1973	1981	1993
MIN	.000	1.11	.46	.16	4.18	46.6	42.5	37.5	2.65	.000	.000	.000
(WY)	1989	1977	1977	1977	1977	1992	1986	1988	1988	1988	1984	1988

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1973 - 1998
ANNUAL TOTAL	32313.22		73010.27
ANNUAL MEAN	88.5		200		151
HIGHEST ANNUAL MEAN					260	1973,1993
LOWEST ANNUAL MEAN					57.0	1980
HIGHEST DAILY MEAN	1630	Feb 27	1880	May 4	3720	Mar 5 1979
LOWEST DAILY MEAN	.40	A	.00 B	Sep 20	.00	C
ANNUAL SEVEN-DAY MINIMUM	.44	Oct 3	.04	Sep 14	.00	Aug 28 1976
INSTANTANEOUS PEAK FLOW			2030	May 4	4030 D	Mar 5 1979
INSTANTANEOUS PEAK STAGE			13.01	May 4	15.39 E	Apr 12 1994
ANNUAL RUNOFF (CFSM)	.59		1.34		1.01
ANNUAL RUNOFF (INCHES)	8.07		18.23		13.74
10 PERCENT EXCEEDS	261		623		407
50 PERCENT EXCEEDS	27		69		55
90 PERCENT EXCEEDS	1.2		.48		.75

A - Oct. 8, 9, 25; estimated, may have been less during period of estimated discharge in Oct.
B - Estimated.
C - Many days in most years.
D - Gage height, 14.03 ft.
E - Discharge, 3,390 ft³/s.