05568000 DATA: Discharge Tables, 2000

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.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: March 1921 to October 1956; October 1988 to current year.

STAGE: Water years 1994-2000.

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.

BIOLOGICAL: Benthic macroinvertebrates, September 1996; fish, July 1997.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, 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 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 (backwater from ice), 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 estimated discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	51	38	36	38	38	e80	76	157	793	441	96	46
2	52	41	36	39	40	e86	75	163	654	386	87	43
3	56	37	38	39	43	e76	75	151	550	379	81	40
4	81	36	39	40	44	e69	71	155	492	358	77	37
5	63	36	70	38	47	e65	67	150	482	499	84	34

6	57	34	82	38	51	e63	65	144	427	429	97	34
7	56	34	69	37	56	e62	67	138	385	457	78	35
8	55	34	74	39	58	61	81	133	345	415	74	35
9	53	35	65	41	59	59	71	251	315	336	74	34
10	51	37	58	43	e60	55	66	255	294	299	69	33

11	47	36	53	44	e62	53	68	248	282	294	65	32
12	45	36	50	41	e64	52	70	229	272	278	62	34
13	44	36	47	40	e62	51	67	318	299	252	59	45
14	42	36	45	38	e60	50	67	260	291	226	57	33
15	41	39	46	38	e60	51	66	218	330	204	56	33

16	41	38	48	37	e62	54	65	187	290	184	54	32
17	40	36	45	36	e66	58	66	174	315	170	55	32
18	39	36	43	36	e70	54	67	170	287	157	54	31
19	38	36	43	36	e80	68	68	392	246	155	50	30
20	38	36	43	37	e100	148	85	659	312	144	48	33

21	38	36	39	e43	e94	155	165	631	1100	132	46	36
22	38	36	40	e42	e90	132	246	469	884	122	46	37
23	37	38	38	e39	e100	128	378	411	1060	111	51	34
24	37	42	38	e37	e120	125	307	345	1220	102	49	43
25	36	40	38	e35	e150	120	263	288	1270	95	49	47

26	36	37	38	e34	e120	105	230	248	1120	89	49	44
27	36	36	36	e33	e100	109	211	2000	885	85	48	41
28	36	36	36	e32	e93	100	194	2260	699	81	46	41
29	36	37	37	e31	e86	89	177	1740	582	81	46	39
30	35	37	38	e33	---	83	164	1260	501	95	45	37

31	35	---	38	e35	---	79	---	973	---	124	43	---

TOTAL	1390	1102	1446	1169	2135	2540	3738	15177	16982	7180	1895	1105
MEAN	44.8	36.7	46.6	37.7	73.6	81.9	125	490	566	232	61.1	36.8
MAX	81	42	82	44	150	155	378	2260	1270	499	97	47
MIN	35	34	36	31	38	50	65	133	246	81	43	30
CFSM	.04	.03	.04	.04	.07	.08	.12	.46	.53	.22	.06	.03
IN.	.05	.04	.05	.04	.07	.09	.13	.53	.59	.25	.07	.04

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 2000, BY WATER YEAR (WY)
MEAN	299	416	457	705	944	1083	1329	1291	870	566	281	352
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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1921 - 2000
ANNUAL TOTAL	299145		55859
ANNUAL MEAN	820		153		719
HIGHEST ANNUAL MEAN					2353	1993
LOWEST ANNUAL MEAN					98.4	1940
HIGHEST DAILY MEAN	10500	Jun 16	2260	May 28	23500	Apr 24 1944
LOWEST DAILY MEAN	34	A	30	Sep 19	17	B
ANNUAL SEVEN-DAY MINIMUM	35	Nov 3	32	Sep 14	18	Oct 21 1940
INSTANTANEOUS PEAK FLOW			2900	May 27	51000 C	Dec 6 1982
INSTANTANEOUS PEAK STAGE			18.83	May 27	D	Sep 16 1993
INSTANTANEOUS LOW FLOW			29	Sep 18, 19	17 E	B
ANNUAL RUNOFF (CFSM)	.76		.14		.67
ANNUAL RUNOFF (INCHES)	10.37		1.94		9.11
10 PERCENT EXCEEDS	2090		349		1780
50 PERCENT EXCEEDS	264		59		252
90 PERCENT EXCEEDS	37		36		44

A - Jan. 14 & 15, estimated due to backwater from ice, Nov. 6-8.
B - Oct. 26, 27, 1940.
C - Gage height, 16.13 ft, backwater from ice, site then in use.
D - Maximum recorded, 28.29 ft; discharge unknown.
E - Observed.