05444000 DATA: Discharge Tables, 2001

Station list Available data
ROCK RIVER BASIN

05444000 ELKHORN CREEK NEAR PENROSE, IL

LOCATION.-- Lat 41°54'10", long 89°41'46", in SW1/4SE1/4 sec.9, T.22 N., R.7 E., Whiteside County, Hydrologic Unit 07090005, on left bank 50 ft upstream from bridge on County Road 2200 N, 2 mi northwest of Penrose, 2.2 mi downstream from Buffalo Creek, 5 mi upstream from Sugar Creek, and at mile 17.5.

DRAINAGE AREA.-- 146 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 1979-91.

REVISED RECORDS.-- WSP 925: 1940. WSP 955: 1941. WSP 1175: 1941(P), 1948(P). WSP 1308: 1950(M). WDR IL-72-1: Drainage area.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 657.85 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Apr. 6, 1940, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,770 ft³/s, May 17, 1974, gage height, 16.53 ft; maximum gage height, 17.75 ft, Jan. 5, 1946; minimum discharge, 1.9 ft³/s, Jan. 3, 1976, result of freezeup.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of June 1938 reached a stage of 19.6 ft, from U.S. Army Corps of Engineers high-water mark.

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	87	76	65	e57	e116	224	139	116	152	86	67	52
2	86	76	64	e57	e100	214	133	115	155	82	113	52
3	85	74	63	e58	e90	281	129	113	143	110	93	52
4	92	74	64	60	85	314	125	115	134	96	73	51
5	90	74	60	60	80	230	129	113	198	86	68	50

6	85	79	e61	59	75	196	170	113	232	82	66	55
7	83	88	e62	58	69	188	174	111	178	82	65	73
8	82	78	62	e60	75	189	156	107	161	83	63	80
9	82	79	e62	e62	987	173	156	104	151	81	63	96
10	82	85	e62	e60	589	175	150	106	145	78	73	107

11	82	79	e61	56	308	223	159	125	137	75	64	73
12	82	76	e60	60	195	227	206	119	132	74	61	64
13	82	75	e59	62	159	234	181	109	129	74	60	59
14	82	73	e59	63	145	206	169	110	122	72	58	56
15	81	72	e58	64	134	244	163	109	121	70	59	55

16	80	72	e58	62	122	295	154	104	117	69	76	55
17	81	70	e58	58	117	241	144	100	112	69	70	55
18	79	69	e58	55	e112	240	138	97	112	170	66	57
19	79	69	e58	e54	e108	230	137	94	109	107	66	116
20	79	67	e58	e54	e105	217	137	93	105	78	63	140

21	79	67	e58	e53	103	208	136	180	105	203	59	100
22	78	e66	e57	e52	101	198	143	185	104	92	59	91
23	79	66	e57	e52	104	188	150	151	100	79	59	88
24	79	66	e57	e51	694	177	135	140	97	76	60	126
25	79	67	e57	e50	2170	166	133	132	95	74	63	102

26	79	68	e57	e50	534	158	133	131	93	73	64	88
27	78	67	e57	51	392	154	127	138	91	70	60	80
28	77	66	e56	71	259	150	122	129	89	69	56	75
29	76	67	e56	67	---	147	119	123	88	69	55	71
30	76	66	e56	186	---	143	117	118	87	68	54	69

31	76	---	e57	177	---	141	---	121	---	65	53	---

TOTAL	2517	2171	1837	2039	8128	6371	4364	3721	3794	2662	2029	2288
MEAN	81.2	72.4	59.3	65.8	290	206	145	120	126	85.9	65.5	76.3
MAX	92	88	65	186	2170	314	206	185	232	203	113	140
MIN	76	66	56	50	69	141	117	93	87	65	53	50
CFSM	.56	.50	.41	.45	1.99	1.41	1.00	.82	.87	.59	.45	.52
IN.	.64	.55	.47	.52	2.07	1.62	1.11	.95	.97	.68	.52	.58

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2001, BY WATER YEAR (WY)
MEAN	66.3	72.2	74.4	98.0	154	180	128	129	141	94.1	75.4	67.5
MAX	280	314	267	580	556	588	618	607	560	401	422	225
(WY)	1982	1986	1973	1969	1951	1993	1973	1974	1993	1951	1972	1972
MIN	15.6	17.6	15.4	14.6	22.3	33.6	34.7	25.7	25.8	19.2	23.0	14.7
(WY)	1958	1950	1959	1959	1964	1956	1957	1940	1957	1940	1963	1957

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1940 - 2001
ANNUAL TOTAL	55904		41921
ANNUAL MEAN	153		115		106
HIGHEST ANNUAL MEAN					275	1973
LOWEST ANNUAL MEAN					30.7	1940
HIGHEST DAILY MEAN	3610	Jun 13	2170	Feb 25	5430	Apr 21 1973
LOWEST DAILY MEAN	40 A	Jan 28	50	B	10	Dec 10 1958
ANNUAL SEVEN-DAY MINIMUM	42	Jan 26	51	Jan 21	10	Dec 9 1958
MAXIMUM PEAK FLOW			2820	Feb 25	6770 C	May 17 1974
MAXIMUM PEAK STAGE			11.46	Feb 25	17.75 D	Jan 5 1946
INSTANTANEOUS LOW FLOW			E		1.9 F	Jan 3 1976
ANNUAL RUNOFF (CFSM)	1.05		.79		.73
ANNUAL RUNOFF (INCHES)	14.24		10.68		9.89
10 PERCENT EXCEEDS	272		183		179
50 PERCENT EXCEEDS	88		82		64
90 PERCENT EXCEEDS	53		57		26

	A - Estimated due to backwater from ice.
	B - Jan. 25 and 26, estimated due to backwater from ice; and Sept. 5.
	C - Gage height, 16.53 ft.
	D - Discharge, 5,980 ft³/s.
	E - Minimum not determined, occurred during periods of ice effect Nov. 22,
	Dec. 6-7, Dec. 9-Jan. 3, Jan. 8-10, and Jan. 19-26.
	F - Result of freezeup.