05448000 DATA: Discharge Tables, 1999

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 Oct. 18-27, Nov. 11-12, Dec. 6-27, Jan. 2-8, 18-22, Mar. 17-Apr. 6, Apr. 15-May 9, and May 24-June 8, which are fair, and 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 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	13	87	58	e52	e160	44	50	109	69	77	8.1	3.0
2	18	202	56	e62	e250	50	49	100	156	49	5.8	6.1
3	40	185	55	e58	e210	51	190	93	91	41	5.4	4.6
4	28	133	54	e56	e170	47	e140	94	270	37	5.2	3.5
5	205	114	54	e54	e140	50	e94	90	211	34	4.5	2.8

6	104	101	143	e66	e125	51	86	83	371	34	5.4	2.6
7	70	92	253	e60	e115	42	e78	80	308	33	6.5	2.5
8	55	93	149	e57	e105	39	e150	73	132	31	8.4	2.7
9	47	101	125	e54	e98	e43	e140	66	97	29	5.8	2.4
10	41	1300	109	e51	e92	e49	e110	e59	87	26	5.5	4.3

11	37	271	100	e48	e130	47	e88	e55	94	24	3.8	2.3
12	35	190	96	e46	e110	49	e79	e70	126	23	32	2.4
13	31	159	90	e45	e96	49	e76	e420	352	24	19	5.2
14	31	142	86	e43	e83	47	e74	e250	152	21	8.4	2.5
15	41	122	83	e42	e74	52	e300	e170	107	19	8.0	2.2

16	33	116	82	e41	e67	82	609	e140	90	18	5.0	3.6
17	1460	102	78	e41	e60	144	287	e120	81	17	4.5	2.1
18	2270	93	82	e40	e55	109	204	e105	72	17	5.1	2.0
19	313	87	75	e40	e51	85	170	e95	63	16	8.5	2.2
20	222	82	66	e40	e48	80	144	e90	59	22	6.9	2.1

21	179	77	58	e70	e47	72	130	e100	55	17	4.0	2.0
22	149	77	e52	e150	e46	65	130	e140	51	14	3.8	1.9
23	133	74	e60	e340	e46	65	435	e96	55	14	41	3.1
24	120	66	e65	e290	e45	63	207	e76	57	16	57	3.7
25	107	67	e69	e240	43	59	163	65	51	12	15	1.9

26	100	63	e70	e170	45	56	143	63	47	14	8.4	2.2
27	113	61	e69	e240	59	57	151	58	45	13	6.6	9.3
28	127	59	e66	e300	50	61	173	55	46	13	5.7	187
29	98	59	e56	e200	---	57	137	53	42	12	4.7	45
30	105	71	e35	e160	---	52	118	53	42	8.9	3.7	15

31	86	---	e43	e150	---	51	---	50	---	7.5	3.4	---

TOTAL	6411	4446	2537	3306	2620	1868	4905	3171	3479	733.4	315.1	332.2
MEAN	207	148	81.8	107	93.6	60.3	164	102	116	23.7	10.2	11.1
MAX	2270	1300	253	340	250	144	609	420	371	77	57	187
MIN	13	59	35	40	43	39	49	50	42	7.5	3.4	1.9
CFSM	3.31	2.38	1.31	1.71	1.50	.97	2.62	1.64	1.86	.38	.16	.18
IN.	3.82	2.65	1.51	1.97	1.56	1.11	2.92	1.89	2.07	.44	.19	.20

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1999, BY WATER YEAR (WY)
MEAN	23.1	24.7	27.3	39.3	61.2	76.9	78.4	72.2	67.8	40.9	25.1	19.3
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1940 - 1999
ANNUAL TOTAL	40208.3		34123.7
ANNUAL MEAN	110		93.5		47.8
HIGHEST ANNUAL MEAN					173	1993
LOWEST ANNUAL MEAN					8.67	1957
HIGHEST DAILY MEAN	2270	Oct 18	2270	Oct 18	5000	Jul 8 1986
LOWEST DAILY MEAN	5.5	Sep 12	1.9	Sep 22,25	.00	A
ANNUAL SEVEN-DAY MINIMUM	6.7	Sep 7	2.2	Sep 17	.00	Dec 30 1939
INSTANTANEOUS PEAK FLOW			5760	Oct 18	9300	Apr 22 1973
INSTANTANEOUS PEAK STAGE			9.69	Oct 18	12.65 B	Apr 22 1973
INSTANTANEOUS LOW FLOW			1.4	Sep 24
ANNUAL RUNOFF (CFSM)	1.77		1.50		.77
ANNUAL RUNOFF (INCHES)	23.97		20.34		10.41
10 PERCENT EXCEEDS	204		171		92
50 PERCENT EXCEEDS	75		59		17
90 PERCENT EXCEEDS	17		5.3		1.6

A - At times in several years.
B - Present datum.