USGS CD-ROM: Current Year Discharge

05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL

LOCATION.--Lat 40°27'15", long 89°36'22", in SE¼SE¼ 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 May 8-27 and 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	63	72	249	244	1050	1590	2350	3950	1080	1220	206	85
2	61	73	241	267	1380	1380	2280	5680	990	1170	200	83
3	58	69	220	302	1440	1240	2120	4170	930	940	194	79
4	58	67	209	340	1260	1130	1920	2910	893	824	192	78
5	56	70	202	566	1110	1030	1780	2970	855	752	234	75

6	54	89	190	961	988	942	1730	5060	813	789	197	73
7	52	88	181	1360	885	885	1640	5490	778	1110	188	71
8	51	107	170	2020	808	1230	1940	7150	763	1580	177	68
9	49	130	164	3020	750	3010	2130	7780	998	1560	171	67
10	47	122	167	2940	711	3290	2040	9560	1120	1190	160	66

11	47	114	167	2300	1300	3070	1820	e8410	1360	881	152	65
12	46	106	163	1760	3740	2440	1660	4000	3100	740	147	64
13	51	100	150	1390	3290	2070	1610	4350	3220	651	142	62
14	62	96	135	1120	2410	1920	1930	3410	2520	586	139	62
15	51	93	130	1050	1970	1800	1830	2750	3010	532	140	69

16	52	92	147	972	1710	1670	1790	2410	4730	485	143	66
17	55	89	144	843	1570	2650	1680	2060	3650	443	133	63
18	53	85	140	741	1590	7430	1500	1820	4060	407	281	61
19	53	82	143	653	1690	7500	1380	1660	3670	379	182	61
20	49	81	146	569	1730	8030	1300	1540	2760	355	175	59

21	49	81	160	585	1590	6860	1310	1430	2190	330	139	56
22	48	81	177	570	1440	5930	1580	1410	1850	305	125	55
23	47	80	192	530	1320	5690	1780	1380	1810	310	117	55
24	47	78	212	500	1220	5000	1570	1930	1500	311	107	58
25	52	77	257	471	1140	3440	1430	2100	1330	281	102	67

26	52	76	321	447	1080	2840	1340	1840	1180	261	97	58
27	58	74	370	435	1520	2480	1220	1520	1060	245	94	56
28	59	87	365	434	1800	2370	1090	1350	988	239	92	56
29	58	111	339	522	---	2590	1180	1240	1050	228	97	54
30	70	191	325	764	---	2560	1250	1180	1090	220	92	54

31	70	---	285	953	---	2350	---	1180	---	212	88	---

TOTAL	1678	2761	6461	29629	42492	96417	50180	103690	55348	19536	4703	1946
MEAN	54.1	92.0	208	956	1518	3110	1673	3345	1845	630	152	64.9
MAX	70	191	370	3020	3740	8030	2350	9560	4730	1580	281	85
MIN	46	67	130	244	711	885	1090	1180	763	212	88	54
CFSM	.05	.09	.19	.89	1.41	2.90	1.56	3.12	1.72	.59	.14	.06
IN.	.06	.10	.22	1.03	1.47	3.34	1.74	3.59	1.92	.68	.16	.07

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 1998, BY WATER YEAR (WY)
MEAN	310	432	475	719	967	1113	1352	1279	837	575	289	365
MAX	3525	3417	2425	3514	3066	3629	4996	5756	2516	3109	2404	6057
(WY)	1927	1927	1928	1993	1927	1993	1944	1943	1946	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 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1921 - 1998
ANNUAL TOTAL	159596		414841
ANNUAL MEAN	437		1137		730
HIGHEST ANNUAL MEAN					2353	1993
LOWEST ANNUAL MEAN					98.4	1940
HIGHEST DAILY MEAN	6490	Feb 28	9560	May 10	23500	Apr 24 1944
LOWEST DAILY MEAN	46	Oct 12	46	Oct 12	17	A
ANNUAL SEVEN-DAY MINIMUM	49	Oct 7	49	Oct 7	18	Oct 21 1940
INSTANTANEOUS PEAK FLOW			10800	May 11	51000 B	Dec 5 1982
INSTANTANEOUS PEAK STAGE			25.97	May 11	C	Sep 16 1993
INSTANTANEOUS LOW FLOW			46	Oct 10, 12, 13	17 D	A
ANNUAL RUNOFF (CFSM)	.41		1.06		.68
ANNUAL RUNOFF (INCHES)	5.53		14.38		9.24
10 PERCENT EXCEEDS	907		2870		1800
50 PERCENT EXCEEDS	190		569		260
90 PERCENT EXCEEDS	62		60		44

A - Oct. 26, 27, 1940.
B - Gage height, 16-13 ft, site then in use.
C - Maximum recorded, 28.29 ft.; discharge unknown.
C - Observed.