05444000 DATA: Discharge Tables, 2000

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 1994-2000.

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 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	83	64	55	55	e43	181	74	179	422	225	143	94
2	78	63	56	57	e44	155	74	168	382	234	146	92
3	80	63	58	61	e44	141	73	158	288	807	135	92
4	90	63	59	59	e45	132	70	152	244	359	131	91
5	85	63	70	53	e46	125	69	145	271	312	153	89

6	80	62	69	58	e47	117	69	140	244	285	163	88
7	77	61	62	51	e48	113	69	138	215	257	138	88
8	75	61	63	52	e49	113	71	134	200	240	132	87
9	74	61	67	59	e51	108	71	175	184	233	126	86
10	74	61	75	63	54	100	72	275	171	889	121	89

11	73	61	74	65	52	96	73	241	233	404	117	95
12	72	60	70	61	48	95	70	226	1380	310	115	133
13	72	60	67	56	54	94	69	194	3610	280	114	94
14	71	60	65	54	49	92	68	175	2320	255	113	91
15	71	60	64	61	51	91	68	167	e950	235	111	87

16	74	59	61	56	51	89	67	162	508	223	108	85
17	71	59	59	e51	49	85	68	159	426	212	122	85
18	71	59	57	e46	51	85	68	200	376	203	121	85
19	70	59	62	e44	48	86	78	247	345	198	108	84
20	69	57	50	e48	51	89	507	212	328	191	106	91

21	70	57	e60	e52	49	87	1210	190	312	183	105	91
22	70	57	e56	e49	78	85	461	181	288	175	105	102
23	68	60	e52	e48	158	84	348	171	270	170	106	208
24	68	61	e51	e46	294	84	323	158	406	165	104	132
25	68	58	e50	e44	268	82	278	146	403	161	101	104

26	67	58	e50	e43	445	79	244	144	303	159	103	96
27	67	58	e51	e41	329	78	225	151	277	156	98	93
28	67	55	e52	e40	237	78	208	151	260	151	97	90
29	67	55	e53	e41	199	77	198	142	270	149	97	91
30	67	54	e54	e42	---	74	185	140	237	147	97	87

31	65	---	55	e43	---	74	---	139	---	148	96	---

TOTAL	2254	1789	1847	1599	3032	3069	5528	5360	16123	8116	3632	2920
MEAN	72.7	59.6	59.6	51.6	105	99.0	184	173	537	262	117	97.3
MAX	90	64	75	65	445	181	1210	275	3610	889	163	208
MIN	65	54	50	40	43	74	67	134	171	147	96	84
CFSM	.50	.41	.41	.35	.72	.68	1.26	1.18	3.68	1.79	.80	.67
IN.	.57	.46	.47	.41	.77	.78	1.41	1.37	4.11	2.07	.93	.74

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2000, BY WATER YEAR (WY)
MEAN	66.1	72.2	74.7	98.5	152	180	127	129	141	94.3	75.5	67.3
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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1940 - 2000
ANNUAL TOTAL	52066		55269
ANNUAL MEAN	143		151		106
HIGHEST ANNUAL MEAN					275	1973
LOWEST ANNUAL MEAN					30.7	1940
HIGHEST DAILY MEAN	1620	Apr 23	3610	Jun 13	5430	Apr 21 1973
LOWEST DAILY MEAN	50	A	40	B	10	Dec 10 1958
ANNUAL SEVEN-DAY MINIMUM	51	Dec 23	42	Jan 26	10	Dec 9 1958
INSTANTANEOUS PEAK FLOW			4800	Jun 13	6770 C	May 17 1974
INSTANTANEOUS PEAK STAGE			15.09	Jun 13	17.75 D	Jan 5 1946
INSTANTANEOUS LOW FLOW			26	Feb 20	1.9 E	Jan 3 1976
ANNUAL RUNOFF (CFSM)	.98		1.03		.73
ANNUAL RUNOFF (INCHES)	13.27		14.08		9.88
10 PERCENT EXCEEDS	239		272		179
50 PERCENT EXCEEDS	110		87		63
90 PERCENT EXCEEDS	61		51		26

A - Dec. 20; Dec. 25 & 26, estimated due to backwater from ice.
B - Jan. 28, estimated due to backwater from ice.
C - Gage height, 16.53 ft.
D - Discharge, 5,980 ft³/s.
E - Result of freezeup.