05446500 DATA: Discharge Tables, 2001

Station list Available data
ROCK RIVER BASIN

05446500 ROCK RIVER NEAR JOSLIN, IL

LOCATION.-- Lat 41°33'21", long 90°11'08", in NE1/4NE1/4 sec.18, T.18 N., R.3 E., Rock Island County, Hydrologic Unit 07090005, near center of span on downstream side of bridge on State Highway 92, 1.8 mi east of Joslin, 14.5 mi downstream from Rock Creek, and at mile 26.9.

DRAINAGE AREA.-- 9,549 mi².

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

DISCHARGE: October 1939 to current year.

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1975-94.

SEDIMENT: May 1980-September 1982.

SPECIFIC CONDUCTANCE: Water years 1976-81.

WATER TEMPERATURE: Water years 1976-81.

REVISED RECORDS.-- WDR IL-79-1: 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 564.06 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Apr. 6, 1940, nonrecording gage at same site and datum.

REMARKS.-- Some diurnal fluctuation caused by powerplants upstream from station.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 46,500 ft³/s, Mar. 26, 1993, gage height, 18.35 ft. (affected by levee break); maximum gage height, 18.88 ft, Feb. 23, 1997 (backwater from ice); minimum daily discharge, 834 ft³/s, Jan. 3, 1940.
SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 1,210 mg/L June 14, 1981; minimum daily mean, 17 mg/L Feb. 9, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 48,000 tons Apr. 5, 1982; minimum daily, 131 tons Feb. 9, 1981.

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	7180	4360	5040	e3500	e5400	e21000	11500	10700	9640	8730	3790	4500
2	6560	4410	4970	e3500	e5200	e18000	11300	8880	9890	8620	3820	4210
3	6000	4370	4970	e3600	e5200	e16000	11100	9570	10300	8610	4540	3940
4	6140	4290	4930	e3700	e5200	e15000	10800	9670	10400	8940	5460	3790
5	6290	3950	4670	e3800	e5300	15200	10600	9690	10700	8410	5680	3750

6	6090	4080	4770	e3900	e5400	14700	10500	10600	10800	7970	5640	3770
7	6060	4510	4690	e4000	e5400	13200	10800	11000	12200	7690	5750	4120
8	5830	4310	3950	e4100	e6000	12600	10800	11200	12600	7570	5730	4350
9	5420	5130	3970	e4200	e9000	11900	11100	10800	12300	7100	5390	4690
10	5240	5250	4530	e4200	e12000	11400	10900	10800	11600	7430	5010	6280

11	5160	6250	4240	e4200	19100	10900	11100	10500	11300	6720	4840	7100
12	5030	6320	e4000	e4100	20500	11000	11700	11000	10900	6550	4310	6830
13	5000	6750	e3300	e4100	20900	11300	12800	11200	10200	6050	4020	6510
14	4490	6430	e2300	e4100	20900	11700	13800	11600	11000	5970	3830	6590
15	4590	6080	e2500	e4000	20900	12300	14100	11700	11200	5800	3940	6400

16	4740	6020	e3000	e4000	20800	13200	14000	11200	11200	5460	3880	6010
17	5530	5720	e3200	e4000	19800	14300	13700	10700	11100	5460	3640	5770
18	3930	5680	e3400	e4100	17900	14900	13400	10400	11300	4670	3860	5670
19	3560	5330	e3500	e4100	15800	14900	13000	10100	11100	5790	4010	5880
20	4420	5260	e3600	e4200	14700	14800	12500	9100	11100	5110	3890	6660

21	4540	5390	e3600	e4200	16000	14700	12500	9300	10900	4590	3820	7490
22	4690	5340	e3500	e4300	16000	14500	12500	9810	10800	5480	3860	8520
23	4390	5120	e3400	e4300	14200	14300	12500	10100	10500	4740	3700	9050
24	4430	4990	e3400	e4200	14100	13800	12100	9750	10400	4440	3700	9110
25	4200	5070	e3300	e4200	e17500	13500	12500	9910	10100	4880	3840	9520

26	4420	5440	e3300	e4100	e23000	13100	12000	10200	9860	4660	3990	9950
27	4340	5240	e3400	e4000	e26500	12800	11800	10500	9660	4350	4030	9280
28	5020	5360	e3400	e4000	e24000	12400	11700	10300	9570	4320	4170	8470
29	4690	5260	e3400	e4100	---	12200	11300	10200	8980	4270	4210	8330
30	4600	5160	e3500	e4500	---	11900	11100	10000	8840	4180	4270	8320

31	4620	---	e3500	e5000	---	11700	---	9550	---	4050	4570	---

TOTAL	157200	156870	117230	126300	406700	423200	359500	320030	320440	188610	135190	194860
MEAN	5071	5229	3782	4074	14520	13650	11980	10320	10680	6084	4361	6495
MAX	7180	6750	5040	5000	26500	21000	14100	11700	12600	8940	5750	9950
MIN	3560	3950	2300	3500	5200	10900	10500	8880	8840	4050	3640	3750
CFSM	.53	.55	.40	.43	1.52	1.43	1.25	1.08	1.12	.64	.46	.68
IN.	.61	.61	.46	.49	1.58	1.65	1.40	1.25	1.25	.73	.53	.76

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2001, BY WATER YEAR (WY)
MEAN	4527	5162	4988	5237	6450	10840	10840	8560	7504	5877	4407	4241
MAX	17110	16700	14780	15820	14520	22500	26950	26030	26810	24000	12420	13470
(WY)	1987	1986	1983	1973	2001	1948	1993	1973	2000	1993	1993	1972
MIN	1381	1626	1519	1172	1554	2803	3877	2032	2052	1902	1349	1084
(WY)	1957	1950	1959	1940	1940	1954	1940	1958	1977	1965	1958	1958

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1940 - 2001
ANNUAL TOTAL	2981840		2906130
ANNUAL MEAN	8147		7962		6550
HIGHEST ANNUAL MEAN					14560	1993
LOWEST ANNUAL MEAN					2587	1964
HIGHEST DAILY MEAN	43700	Jun 16	26500 A	Feb 27	44700	Mar 22 1948
LOWEST DAILY MEAN	2300 A	Dec 14	2300 A	Dec 14	834	Jan 3 1940
ANNUAL SEVEN-DAY MINIMUM	2620	Feb 3	3030	Dec 13	977	Jan 1 1940
MAXIMUM PEAK FLOW			27000 A	Feb 27	46500 B	Mar 26 1993
MAXIMUM PEAK STAGE			18.02 C	Feb 27	18.88 C	Feb 23 1997
ANNUAL RUNOFF (CFSM)	.85		.83		.69
ANNUAL RUNOFF (INCHES)	11.62		11.32		9.32
10 PERCENT EXCEEDS	16800		13600		13000
50 PERCENT EXCEEDS	5560		6050		4980
90 PERCENT EXCEEDS	3300		3850		2000

	A - Estimated due to backwater from ice.
	B - Gage height, 18.35 ft., affected by levee break.
	C - Backwater from ice.