05568000 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN

05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL


LOCATION.-- Lat 40°27'15", long 89°36'22" (NAD of 1927), 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.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: March 1921 to September 1956; June 1988 to current year.
	STAGE: Water years 1994 to current year.
	PARTIAL RECORD: Annual maximum, water years 1957-88.
SURFACE-WATER QUALITY
	CHEMICAL: October 1997 to September 1998.
	SEDIMENT: October 1994 to September 1997.
	MISCELLANEOUS: Contaminants of streambed sediment, July 1997; contaminants of fish tissue, July 1997; streambank sediment size, October 1997; Streambed sediment size, October 1997; sediment concentration and particle size, water years 1996-98.
BIOLOGICAL
	BENTHIC MACROINVERTEBRATES: Water year 1996 and 1997.
	FISH: Water year 1997.
	HABITAT: Water year 1996.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and a crest-stage gage. Datum of gage is 477.10 ft above NGVD of 1929 (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 down stream at present datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 51,000 ft³/s, Dec. 6, 1982, gage height, 16.13 ft, site then in use; maximum recorded gage height, 28.29 ft, Sept. 16, 1993 (discharge unknown); minimum discharge observed, 17 ft³/s, Oct. 26, 27, 1940.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 6,160 mg/L, May 27, 1996; minimum daily, 4 mg/L, May 11, 1997.
SUSPENDED-SEDIMENT LOADS: Maximum daily 99,800 tons, May 27, 1996; minimum daily, 0.83 tons, Dec. 21, 1996.

REMARKS FOR CURRENT YEAR.-- Records good except those for May 31 to June 18, which are fair, and those for estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	62	82	470	399	e180	e325	2580	701	5520	360	138	104
2	59	79	426	426	e180	e315	2510	773	5120	339	133	94
3	60	80	388	405	e175	e290	1900	734	3670	348	128	91
4	59	88	369	373	e170	e450	1530	692	2500	329	136	87
5	58	161	371	e340	e170	e900	1270	677	2040	310	125	81

6	56	144	366	e300	e165	e1300	1090	642	1740	326	116	74
7	56	134	351	e320	e160	e1050	980	595	1520	320	113	68
8	56	126	336	e340	e170	e900	903	552	1300	319	109	66
9	57	110	333	345	e165	e780	820	526	1140	287	104	64
10	68	106	403	343	e160	e720	741	507	1190	350	98	62

11	59	107	460	332	e155	e670	679	500	1600	405	96	61
12	55	104	472	331	e150	e630	639	490	1840	742	93	61
13	53	95	467	301	e145	e580	604	534	2100	631	91	62
14	59	91	438	294	e142	e550	577	812	1650	492	89	62
15	66	89	416	281	e140	e510	556	1170	1360	662	86	70

16	56	88	414	289	e138	e470	538	1520	1180	591	83	353
17	55	90	399	308	e132	e440	518	1460	1020	453	82	177
18	57	532	393	281	e130	e430	495	1250	894	369	85	126
19	59	608	367	264	e200	e460	481	2760	821	319	93	106
20	66	1040	329	233	e300	e420	483	2410	732	287	98	108

21	69	1880	322	269	e400	e370	501	2030	684	262	101	102
22	65	1310	392	300	e520	e340	518	1650	757	246	93	94
23	62	884	407	312	e460	e345	525	1410	699	251	87	87
24	62	943	401	250	e400	e360	490	1230	607	209	88	83
25	78	849	483	e240	e340	e410	758	1640	545	191	107	78

26	96	894	549	e225	e310	475	1190	1750	498	178	156	75
27	77	739	512	e215	e290	575	1190	2030	465	167	130	73
28	82	639	507	e205	e295	1050	978	1710	437	161	171	71
29	81	564	468	e200	e305	1630	863	1390	412	153	152	71
30	89	517	443	e190	---	1760	767	1470	384	147	135	70

31	91	---	419	e185	---	1860	---	4910	---	144	118	---

TOTAL	2028	13173	12871	9096	6647	21365	27674	40525	44425	10348	3434	2781
MEAN	65.4	439	415	293	229	689	922	1307	1481	334	111	92.7
MAX	96	1880	549	426	520	1860	2580	4910	5520	742	171	353
MIN	53	79	322	185	130	290	481	490	384	144	82	61
CFSM	0.06	0.41	0.39	0.27	0.21	0.64	0.86	1.22	1.38	0.31	0.10	0.09
IN.	0.07	0.46	0.45	0.32	0.23	0.74	0.96	1.40	1.54	0.36	0.12	0.10

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 2004, BY WATER YEAR (WY)
MEAN	284	400	443	668	961	1071	1314	1328	892	568	272	333
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 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1921 - 2004
ANNUAL TOTAL	156252		194367
ANNUAL MEAN	428		531		714
HIGHEST ANNUAL MEAN					2353	1993
LOWEST ANNUAL MEAN					98.4	1940
HIGHEST DAILY MEAN	8520	Jul 11	5520	Jun 1	23500	Apr 24 1944
LOWEST DAILY MEAN	32 A	Mar 6	53	Oct 13	17	B
ANNUAL SEVEN-DAY MINIMUM	35	Mar 1	57	Oct 12	18	Oct 21 1940
MAXIMUM PEAK FLOW			5600	Jun 1	51000 C	Dec 6 1982
MAXIMUM PEAK STAGE			22.25	Jun 1	28.29 D	Sep 16 1993
INSTANTANEOUS LOW FLOW			51	Oct 13	17 E	B
ANNUAL RUNOFF (CFSM)	0.399		0.495		0.665
ANNUAL RUNOFF (INCHES)	5.42		6.74		9.04
10 PERCENT EXCEEDS	849		1300		1770
50 PERCENT EXCEEDS	239		340		259
90 PERCENT EXCEEDS	51		72		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, discharge unknown.
	E - Observed.