05568000 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL

LOCATION.--Lat 40°27'15", long 89°36'22", in SE1/4SE1/4 sec.12, T.23 N., R.5 W., Tazewell County, Hydrologic Unit 07130004, on right downstream side of bridge on Towerline Road, 2.5 mi east of State Highway 29, 3.9 mi northeast of Green Valley, 5.8 mi south of Pekin, 10.2 mi north of U.S. Highway 136, and at mile 17.3.

DRAINAGE AREA.--1,073 mi². Area at site used prior to Oct. 1, 1988, 1,089 mi².

PERIOD OF RECORD.--March 1921 to October 1956; annual maximum, water years 1957-88; October 1988 to current year.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 477.10 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Jan. 17, 1933, chain gage at site 3.5 mi downstream on railroad bridge at datum 2.00 ft higher. Jan. 17, 1933, to May 13, 1940, chain gage, and May 14, 1940 to Sept. 30, 1952, wire-weight gage at site 3.6 mi downstream at datum 2.00 ft higher. Oct. 1, 1952 to Oct. 31, 1956, wire-weight gage, and Nov. 1, 1956 to Sept. 30, 1988, crest-stage gage at site 3.6 mi downstream at present datum.

REMARKS.--Records good except those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers satellite 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	58	51	60	46	1430	554	444	1850	1160	1120	164	88
2	56	50	59	e70	1630	546	445	1600	1750	1020	153	86
3	51	56	55	e50	1630	529	430	1410	1460	1080	147	83
4	53	55	54	e42	1340	e550	433	1290	1860	959	141	80
5	58	50	53	e35	1060	572	411	1240	3930	795	142	77

6	64	49	55	e40	888	587	383	1170	2430	691	134	74
7	62	47	111	e47	857	593	390	1320	1870	610	135	73
8	69	47	91	e43	922	591	353	1330	1470	545	152	71
9	64	49	125	e41	998	619	373	1150	1260	499	143	69
10	60	101	119	e39	1060	654	415	1010	1120	460	136	66

11	57	123	97	e38	1020	609	413	922	1040	412	131	64
12	54	108	85	e36	957	529	380	910	2260	374	206	65
13	52	110	78	e35	811	504	349	3880	7070	345	247	66
14	51	91	72	e34	713	499	328	5680	7230	319	172	64
15	50	79	68	e34	663	525	377	4410	7920	296	149	61

16	53	72	66	e45	625	628	1830	3090	10500	277	134	60
17	54	67	63	57	577	e1700	4740	9270	6990	264	126	59
18	72	64	63	78	533	e1800	5030	9850	3030	245	121	59
19	73	62	63	90	495	e1400	3860	6570	2390	341	117	59
20	62	59	66	92	465	e1100	2860	3470	2010	507	114	58

21	67	56	60	103	426	e1000	2340	2780	1740	261	112	58
22	62	56	53	996	396	e850	2080	3530	1550	215	108	57
23	61	55	51	e2550	393	e700	2000	2710	1400	361	144	56
24	56	53	51	e3240	401	654	1950	2260	1310	393	183	55
25	52	53	49	e2570	394	610	1720	1940	1200	203	130	56

26	48	53	48	2100	385	555	1530	1670	1250	182	114	54
27	49	51	48	1810	411	516	1450	1470	1140	176	109	53
28	81	51	48	2880	479	503	2430	1340	1020	579	106	61
29	66	51	51	2600	---	491	2470	1230	942	318	100	64
30	60	53	57	1710	---	464	2170	1140	830	198	94	56

31	56	---	46	1320	---	440	---	1070	---	175	91	---

TOTAL	1831	1922	2065	22871	21959	21872	44384	82562	81132	14220	4255	1952
MEAN	59.1	64.1	66.6	738	784	706	1479	2663	2704	459	137	65.1
MAX	81	123	125	3240	1630	1800	5030	9850	10500	1120	247	88
MIN	48	47	46	34	385	440	328	910	830	175	91	53
CFSM	.06	.06	.06	.69	.73	.66	1.38	2.48	2.52	.43	.13	.06
IN.	.06	.07	.07	.79	.76	.76	1.54	2.86	2.81	.49	.15	.07

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 1999, BY WATER YEAR (WY)
MEAN	304	424	466	720	963	1104	1354	1308	876	573	286	359
MAX	3525	3417	2425	3514	3066	3629	4996	5756	2704	3109	2404	6057
(WY)	1927	1927	1928	1993	1927	1993	1944	1943	1999	1951	1924	1993
MIN	19.8	21.8	26.3	29.6	34.1	49.3	68.8	79.9	53.2	37.1	28.6	23.7
(WY)	1941	1941	1941	1940	1931	1931	1931	1934	1934	1988	1988	1940

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1921 - 1999
ANNUAL TOTAL	409759		301025
ANNUAL MEAN	1123		825		732
HIGHEST ANNUAL MEAN					2353	1993
LOWEST ANNUAL MEAN					98.4	1940
HIGHEST DAILY MEAN	9560	May 10	10500	Jun 16	23500	Apr 24 1944
LOWEST DAILY MEAN	46	Dec 31	34 A	Jan 14, 15	17	B
ANNUAL SEVEN-DAY MINIMUM	49	Dec 23	37	Jan 9	18	Oct 21 1940
INSTANTANEOUS PEAK FLOW			12000	May 17	51000 C	Dec 5 1982
INSTANTANEOUS PEAK STAGE			26.55	May 17	D	Sep 16 1993
INSTANTANEOUS LOW FLOW			28 E	Jan 1	17 F	B
ANNUAL RUNOFF (CFSM)	1.05		.77		.68
ANNUAL RUNOFF (INCHES)	14.21		10.44		9.27
10 PERCENT EXCEEDS	2870		2090		1810
50 PERCENT EXCEEDS	569		264		260
90 PERCENT EXCEEDS	54		51		45

A - Estimated due to backwater from ice.
B - Oct. 26, 27, 1940.
C - Gage height, 16-13 ft, site then in use.
D - Maximum recorded, 28.29 ft; discharge unknown.
E - Result of freezeup.
F - Observed.