05444000 DATA: Discharge Tables, 1999

Station list Available data
ROCK RIVER BASIN

05444000 ELKHORN CREEK NEAR PENROSE, IL

LOCATION.--Lat 41°54'10", long 89°41'40", 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.--October 1939 to current year.

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. 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.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Gage-height telemeter at station.

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

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	79	167	138	e94	198	132	120	249	211	153	96	74
2	78	162	137	e112	313	130	120	239	460	142	92	73
3	87	156	136	e106	334	129	119	230	235	159	91	77
4	88	152	133	e99	235	125	120	220	209	145	90	75
5	251	149	132	e91	196	125	113	218	205	136	90	72

6	245	145	140	e130	187	123	120	214	244	130	91	71
7	179	140	177	e120	180	114	113	213	370	126	93	71
8	151	139	156	e110	174	e108	113	200	214	124	94	70
9	133	139	146	e102	177	e105	140	192	195	131	90	69
10	124	619	140	e97	177	e122	153	186	186	122	89	68

11	117	408	136	e95	210	119	140	179	181	117	86	68
12	111	269	134	e93	297	115	131	339	201	116	89	68
13	106	234	132	e91	213	112	126	1320	389	114	89	68
14	104	219	130	e90	197	112	124	533	286	112	85	67
15	113	200	129	e89	187	114	131	357	218	109	83	67

16	109	191	128	e88	181	125	272	310	200	108	82	66
17	380	180	127	e88	173	168	286	401	190	109	81	65
18	1400	173	126	e87	164	194	225	322	180	109	80	65
19	477	169	124	e86	157	161	203	274	174	116	82	65
20	322	161	118	e86	151	151	190	253	168	124	80	65

21	277	156	117	e88	144	145	201	242	162	e116	79	64
22	237	155	e100	e300	139	138	415	240	160	e110	78	64
23	219	152	e102	e800	137	135	1620	223	189	104	87	64
24	205	145	e107	711	136	133	631	212	220	126	109	64
25	194	145	e110	323	135	129	403	203	163	109	93	64

26	184	142	112	224	133	127	343	195	157	108	82	63
27	185	138	112	214	137	126	322	188	153	114	79	74
28	208	136	109	295	137	124	332	183	150	103	78	177
29	191	136	e96	205	---	123	291	177	146	101	76	151
30	182	140	e66	174	---	120	263	172	142	98	74	96

31	172	---	e78	175	---	120	---	171	---	99	74	---

TOTAL	6908	5617	3828	5463	5199	4004	7880	8655	6358	3690	2662	2265
MEAN	223	187	123	176	186	129	263	279	212	119	85.9	75.5
MAX	1400	619	177	800	334	194	1620	1320	460	159	109	177
MIN	78	136	66	86	133	105	113	171	142	98	74	63
CFSM	1.53	1.28	.85	1.21	1.27	.88	1.80	1.91	1.45	.82	.59	.52
IN.	1.76	1.43	.98	1.39	1.32	1.02	2.01	2.21	1.62	.94	.68	.58

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1999, BY WATER YEAR (WY)
MEAN	66.0	72.4	74.9	99.3	153	181	127	128	134	91.5	74.8	66.8
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1940 - 1999
ANNUAL TOTAL	54863		62529
ANNUAL MEAN	150		171		105
HIGHEST ANNUAL MEAN					275	1973
LOWEST ANNUAL MEAN					30.7	1940
HIGHEST DAILY MEAN	1400	Oct 18	1620	Apr 23	5430	Apr 21 1973
LOWEST DAILY MEAN	41 A	Jan 1	63	Sep 26	10	Dec 10 1958
ANNUAL SEVEN-DAY MINIMUM	46	Jan 25	64	Sep 20	10	Dec 9 1958
INSTANTANEOUS PEAK FLOW			2280	Apr 23	6770 B	May 17 1974
INSTANTANEOUS PEAK STAGE			9.50	Apr 23	17.75 C	Jan 5 1946
INSTANTANEOUS LOW FLOW			63	Sep 26	1.9 D	Jan 3 1976
ANNUAL RUNOFF (CFSM)	1.03		1.17		.72
ANNUAL RUNOFF (INCHES)	13.98		15.93		9.81
10 PERCENT EXCEEDS	245		273		177
50 PERCENT EXCEEDS	127		136		63
90 PERCENT EXCEEDS	72		79		26

A - Estimated due to backwater from ice.
B - Gage height, 16.53 ft.
C - Discharge, 5,980 ft³/s.
D - Result of freezeup.