05447500 DATA: Discharge Tables, 2001

Station list Available data
ROCK RIVER BASIN

05447500 GREEN RIVER NEAR GENESEO, IL

LOCATION.-- Lat 41°29'20", long 90°09'27", in NE1/4SW1/4 sec.4, T.17 N., R.3 E., Henry County, Hydrologic Unit 07090007, on right bank at upstream side of bridge on State Highway 82, 1.4 mi upstream from Geneseo Creek, 2.4 mi north of Geneseo, and at mile 14.9.

DRAINAGE AREA.-- 1,003 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: March 1936 to current year.

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

SEDIMENT: April 1978 to September 1981.

CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WSP 875: 1938. WSP 1508: 1937, 1939-41(M), 1946(P), 1947-49. WDR IL-74-1: Drainage area.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, and crest-stage gage. Datum of gage is 577.66 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1939, nonrecording gage at present site at datum 27.00 ft. lower. Oct. 1, 1939 to Apr. 3, 1940, nonrecording gage at present site at datum 3.0 ft. higher. Apr. 3, 1940 to Sept. 30, 1997, recording gage at present site at datum 3.0 ft. higher.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 12,100 ft³/s, June 22, 1974, gage height, 19.75 ft, present datum; maximum gage height, 21.59 ft present datum, Jan. 23, 1969, ice jam; minimum daily discharge, 22 ft³/s, Jan. 18, 1977.
SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 8,620 mg/L Apr. 14, 1981; minimum daily mean, 17 mg/L Jan. 15, 16, 1979.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 132,000 tons Apr. 14, 1981; minimum daily, 7.3 tons Jan. 15, 16, 1979.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	240	255	e245	e180	e1600	1960	896	741	1170	471	245	128
2	230	258	e240	e185	e1300	1600	861	722	1290	449	272	117
3	228	256	e230	e185	e1200	1410	825	697	1280	461	375	111
4	548	254	e220	e190	e1050	1300	793	687	1110	844	309	108
5	598	251	e220	e195	e950	1170	775	671	2000	751	265	105

6	507	264	e250	e200	e850	1080	803	676	3700	577	236	108
7	444	302	e260	e200	e750	1020	829	685	2550	518	217	114
8	403	296	e260	e205	e900	980	791	658	1880	511	203	111
9	375	312	e245	e205	5240	938	780	640	1510	554	191	130
10	357	401	e235	e200	e5300	898	822	621	1300	493	185	166

11	343	444	e230	e200	e3900	909	839	800	1160	440	175	145
12	331	434	e300	e195	e3200	913	1100	833	1080	403	168	124
13	317	401	e255	e190	2770	e1000	1120	757	1000	379	160	114
14	305	383	e240	e195	2960	e1150	989	748	927	351	149	109
15	298	370	e230	e220	2970	e1450	1330	792	886	335	146	109

16	298	361	e220	e300	2340	e2050	1950	740	850	321	162	110
17	291	348	e210	e390	e1600	2210	1660	712	802	308	171	111
18	285	328	e200	e340	e1400	2070	1350	677	757	322	170	118
19	280	e300	e190	e310	e1300	2030	1200	632	724	352	186	163
20	269	e285	e185	e280	e1200	2000	1110	612	699	361	172	186

21	267	e280	e180	e260	e1100	1920	1040	795	700	329	155	164
22	265	e275	e175	e240	e1000	1810	1110	1140	694	392	147	147
23	264	e270	e170	e235	e950	1610	1190	914	673	368	147	150
24	264	e270	e170	e225	2140	1410	1020	819	646	357	149	165
25	262	e275	e170	e210	5950	1260	940	761	612	450	154	175

26	261	e300	e170	e200	4620	1160	901	791	584	518	157	161
27	260	e280	e170	e190	3640	1090	865	1250	562	384	144	152
28	256	e270	e170	e190	2710	1020	812	1150	540	330	136	144
29	254	e260	e175	e250	---	992	775	974	518	307	126	140
30	257	e250	e175	e500	---	950	754	862	495	286	122	139

31	253	---	e180	e1900	---	915	---	837	---	265	121	---

TOTAL	9810	9233	6570	8965	64890	42275	30230	24394	32699	13187	5715	4024
MEAN	316	308	212	289	2318	1364	1008	787	1090	425	184	134
MAX	598	444	300	1900	5950	2210	1950	1250	3700	844	375	186
MIN	228	250	170	180	750	898	754	612	495	265	121	105
CFSM	.32	.31	.21	.29	2.31	1.36	1.00	.78	1.09	.42	.18	.13
IN.	.36	.34	.24	.33	2.41	1.57	1.12	.90	1.21	.49	.21	.15

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1936 - 2001, BY WATER YEAR (WY)
MEAN	388	458	463	539	769	1040	1076	981	901	565	386	341
MAX	2135	1790	1905	1976	2318	3244	3562	3500	3568	2946	1845	1777
(WY)	1999	1978	1983	1946	2001	1979	1973	1974	1974	1990	1987	1970
MIN	48.8	60.4	57.1	26.5	68.8	198	174	140	127	62.9	61.0	46.5
(WY)	1954	1954	1959	1977	1940	1956	1956	1989	1977	1940	1988	1940

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1936 - 2001
ANNUAL TOTAL	227568		251992
ANNUAL MEAN	622		690		660
HIGHEST ANNUAL MEAN					1579	1993
LOWEST ANNUAL MEAN					159	1940
HIGHEST DAILY MEAN	4110	Jul 5	5950	Feb 25	10100	Mar 19 1979
LOWEST DAILY MEAN	159	Sep 10	105	Sep 5	22	Jan 18 1977
ANNUAL SEVEN-DAY MINIMUM	162	Jan 26	111	Sep 2	24	Jan 17 1977
MAXIMUM PEAK FLOW			6520	Feb 9	12100 A	Jun 22 1974
MAXIMUM PEAK STAGE			15.35	Feb 9	21.59 B	Jan 23 1969
INSTANTANEOUS LOW FLOW			102	Sep 5-6
ANNUAL RUNOFF (CFSM)	.62		.69		.66
ANNUAL RUNOFF (INCHES)	8.44		9.35		8.94
10 PERCENT EXCEEDS	1400		1400		1470
50 PERCENT EXCEEDS	335		370		390
90 PERCENT EXCEEDS	184		159		97

	A - Gage height, 19.75 ft, present datum.
	B - Present datum, due to backwater from ice, discharge 8,000 ft³/s.