05448000 DATA: Discharge Tables, 1998

Station list Available data
ROCK RIVER BASIN

05448000 MILL CREEK AT MILAN, IL

LOCATION.--Lat 41°26'32", long 90°33'21", in NW1/4NE1/4 sec.25, T.17 N., R.2 W., Rock Island County, Hydrologic Unit 07090005, on right bank at upstream side of Knoxville Road Bridge, 1 mi southeast of Milan, and at mile 1.2.

DRAINAGE AREA.--62.4 mi².

PERIOD OF RECORD.--October 1989 to current year. October 1939 to September 1940 (fragmentary), July 1941 to September 1986. Seven-month period (March to September), water years 1987-89.

REVISED RECORDS.--WSP 1308: 1940(M), 1943(M). WDR IL-72-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 565.23 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1987, at datum 1.00 ft higher. Prior to Apr. 5, 1940, nonrecording gage at site 300 ft upstream. Oct. 1939 to Nov. 15, 1984, recording gage at site 400 ft. upstream.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Occasional pumpage of about 1 ft³/s from quarry into creek upstream from gage.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	5.5	13	e28	e18	69	150	376	150	39	105	13	16
2	4.7	12	e25	e20	103	127	242	119	41	80	12	11
3	5.2	12	e23	e170	80	114	187	105	39	70	11	9.6
4	4.9	10	e23	e220	71	102	157	95	38	69	76	9.1
5	4.8	9.8	e21	e205	67	91	137	90	38	59	86	8.0

6	4.5	19	e19	e190	60	86	125	136	35	58	57	8.0
7	3.9	20	e18	e320	57	81	126	187	34	53	26	7.4
8	4.2	18	e17	e200	54	291	240	277	34	47	25	6.4
9	3.8	16	e17	e150	53	266	239	155	143	47	19	6.1
10	5.9	17	e16	e120	54	159	175	126	88	46	27	8.7

11	4.1	16	e15	e100	167	131	145	109	103	39	17	6.9
12	4.0	13	e14	e90	269	114	128	104	94	36	15	5.5
13	6.0	13	e14	e75	162	111	206	101	73	33	13	5.6
14	6.9	15	e13	e78	126	110	236	86	85	31	13	181
15	4.7	13	e14	e65	109	96	215	80	250	29	12	97

16	4.1	12	e13	e60	99	93	390	75	393	27	11	44
17	4.1	11	e13	e55	98	324	192	68	153	25	42	31
18	4.2	12	e13	e52	90	629	154	67	477	24	62	25
19	4.1	11	e13	e52	81	282	132	67	675	22	27	22
20	3.9	11	e13	e48	76	194	140	85	194	21	18	21

21	3.8	11	e14	e46	70	154	263	78	185	21	15	17
22	3.5	9.8	e14	e44	66	134	377	75	133	136	14	16
23	3.9	9.9	e15	e42	64	120	190	69	113	43	13	14
24	9.6	9.6	e16	e41	66	108	149	89	102	29	11	16
25	11	13	e20	e40	61	107	133	73	85	24	11	18

26	8.9	12	e19	e38	67	102	140	65	75	22	11	14
27	15	9.2	e19	e37	391	93	113	58	67	20	11	13
28	14	e30	e21	e37	203	97	103	54	71	19	47	13
29	14	e35	e19	e43	---	87	110	55	302	18	27	23
30	13	e31	e18	54	---	89	99	48	229	17	22	19

31	12	---	e16	49	---	723	---	47	---	14	17	---

TOTAL	202.2	444.3	533	2759	2933	5365	5619	2993	4388	1284	781	692.3
MEAN	6.52	14.8	17.2	89.0	105	173	187	96.5	146	41.4	25.2	23.1
MAX	15	35	28	320	391	723	390	277	675	136	86	181
MIN	3.5	9.2	13	18	53	81	99	47	34	14	11	5.5
CFSM	.10	.24	.28	1.43	1.68	2.77	3.00	1.55	2.34	.66	.40	.37
IN.	.12	.26	.32	1.64	1.75	3.20	3.35	1.78	2.62	.77	.47	.41

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1998, BY WATER YEAR (WY)
MEAN	19.8	22.4	26.3	38.1	60.6	77.2	77.0	71.6	66.9	41.2	25.4	19.4
MAX	209	175	162	223	223	299	335	432	616	388	259	208
(WY)	1955	1962	1983	1960	1959	1960	1965	1996	1993	1986	1993	1970
MIN	.11	.51	.44	.000	2.78	3.95	3.17	3.44	1.86	1.50	.89	.18
(WY)	1957	1957	1977	1940	1964	1956	1956	1956	1956	1988	1957	1956

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1940 - 1998
ANNUAL TOTAL	8822.71		27993.8
ANNUAL MEAN	24.2		76.7		46.9
HIGHEST ANNUAL MEAN					173	1993
LOWEST ANNUAL MEAN					8.67	1957
HIGHEST DAILY MEAN	1820 A	Feb 21	723	Mar 31	5000	Jul 8 1986
LOWEST DAILY MEAN	.55	Aug 10	3.5	Oct 22	.00	B
ANNUAL SEVEN-DAY MINIMUM	1.2	Jan 14	3.9	Oct 17	.00	Dec 30 1939
INSTANTANEOUS PEAK FLOW			2480	Jun 19	9300	Apr 22 1973
INSTANTANEOUS PEAK STAGE			7.11	Jun 19	12.65 C	Apr 22 1973
INSTANTANEOUS LOW FLOW			3.4	Oct 21-23
ANNUAL RUNOFF (CFSM)	.39		1.23		.75
ANNUAL RUNOFF (INCHES)	5.26		16.69		10.22
10 PERCENT EXCEEDS	35		187		90
50 PERCENT EXCEEDS	13		44		16
90 PERCENT EXCEEDS	2.9		9.6		1.6

A - Estimated from graph.
B - At times in several years.
C - Present datum.