SAN JUAN RIVER BASIN

09358000 ANIMAS RIVER AT SILVERTON, CO

LOCATION.--Lat 37°48'40", long 107°39'31", in SE14NW14 sec.17, T.41 N., R.7 W., San Juan County, Hydrologic Unit 14080104, on right bank at southeast end of 14th Street, 800 feet upstream from Cement Creek, in the city of Silverton.

DRAINAGE AREA.--70.6 mi2.

PERIOD OF RECORD.--June to October 1903 (staff gage), monthly discharge only, published in WSP 1313. October 1991 to September 1993, October 1994 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09358000

REVISED RECORDS.--WDR CO 92-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 9,290 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. No diversions upstream for irrigation in Animas River drainage. Natural regulation by many lakes upstream from station. Mineral Point Ditch exports 100 to 400 acre feet of water per year from headwaters of Animas River to Uncompahgre River drainage. City of Silverton diverts some water from Boulder Creek (tributary) for municipal use. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality Data For Gaging Stations" section of this report.

EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1884, was probably that of October 5, 1911.

Discharge, cubic feet per second 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAILY MEAN VALUES

DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP
1	63	39	e28	e18	e18	e17	e26	128	772	162	56	59
2	68	40	e27	e18	e18	e18	e26	125	743	163	52	55
3	76	33	e26	e18	e18	e18	e25	126	660	156	51	54
4	69	33	e26	e19	e18	e19	e25	129	610	146	45	51
5	74	31	e25	e19	e18	e19	e25	110	549	136	44	59
6	71	31	e25	e19	e18	e19	e24	96	468	122	43	67
7	71	31	e26	e19	e19	e19	e24	90	430	114	44	70
8	72	32	e26	e19	e19	e19	e23	86	439	112	47	66
9	71	32	e26	e19	e19	e20	e24	77	453	108	43	101
10	69	e33	e26	e19	e19	e20	e25	70	437	101	44	151
11	67	e33	e25	e19	e19	e20	34	67	402	95	43	135
12	65	e33	e24	e19	e19	e20	38	83	361	90	42	148
13	62	e33	e23	e19	e18	e19	41	118	313	84	67	182
14	59	e33	e23	e20	e17	e19	61	146	289	79	129	179
15	54	e33	e23	e20	e17	e19	75	193	326	74	87	170
16	51	e33	e23	e21	e16	e17	62	187	301	77	81	165
17	50	e33	e22	e22	e16	e16	60	277	262	75	75	159
18	49	e33	e22	e22	e16	e16	58	308	242	71	70	145
19	47	e33	e21	e22	e16	e16	52	282	246	70	64	127
20	45	e32	e20	e22	e16	e16	53	325	241	66	58	117
21	43	e32	e19	e22	e16	e17	61	394	230	65	55	105
22	44	e32	e19	e21	e16	e18	62	525	248	64	53	96
23	45	e32	e18	e21	e15	e19	58	633	250	61	53	87
24	46	e32	e18	e20	e16	e21	55	639	228	58	54	82
25	42	e31	e18	e19	e16	e22	65	590	204	57	50	76
26	40	e30	e18	e19	e16	e22	91	641	198	57	50	71
27	42	e30	e18	e19	e16	e22	120	829	197	57	53	68
28	39	e30	e18	e19	e16	e22	140	967	189	61	66	64
29	39	e29	e18	e19	---	e22	141	1,020	177	60	62	61
30	36	e29	e18	e18	---	e23	136	855	172	63	68	58
31	37	---	e18	e18	---	e25	---	769	---	58	64	---
TOTAL	1,706	971	687	608	481	599	1,710	10,885	10,637	2,762	1,813	3,028
MEAN	55.0	32.4	22.2	19.6	17.2	19.3	57.0	351	355	89.1	58.5	101
MAX	76	40	28	22	19	25	141	1,020	772	163	129	182
MIN	36	29	18	18	15	16	23	67	172	57	42	51
AC-FT	3,380	1,930	1,360	1,210	954	1,190	3,390	21,590	21,100	5,480	3,600	6,010
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1992 - 2003, BY WATER YEAR (WY)
MEAN	60.8	37.3	28.7	25.0	23.1	27.5	63.7	312	498	252	113	79.7
MAX	136	64.9	41.4	33.8	36.1	43.3	92.9	454	794	734	253	131
(WY)	(1998)	(1998)	(1998)	(1995)	(1995)	(1995)	(2000)	(1996)	(1997)	(1995)	(1995)	(1999)
MIN	30.4	21.2	18.9	13.8	15.7	18.6	39.6	147	128	30.5	28.0	42.2
(WY)	(2002)	(2002)	(1992)	(1992)	(1992)	(1992)	(1993)	(1995)	(2002)	(2002)	(2002)	(2001)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1992 - 2003
ANNUAL TOTAL	20,398	35,887
ANNUAL MEAN	55.9	98.3	127
HIGHEST ANNUAL MEAN			194 1995
LOWEST ANNUAL MEAN			52.7 2002
HIGHEST DAILY MEAN	281 Jun 1	1,020 May 29	1,180 Jun 4, 1997
LOWEST DAILY MEAN	e14 Mar 1	e15 Feb 23	9.7 Oct 30, 1999
ANNUAL SEVEN-DAY MINIMUM	15 Feb 25	16 Feb 17	13 Jan 16, 1992
MAXIMUM PEAK FLOW		1,390 May 28	1,470 Jun 4, 1997
MAXIMUM PEAK STAGE		4.32 May 28	a,b3.99 Jun 4, 1997
ANNUAL RUNOFF (AC-FT)	40,460	71,180	91,980
10 PERCENT EXCEEDS	128	241	370
50 PERCENT EXCEEDS	32	45	48
90 PERCENT EXCEEDS	20	18	19

e Estimated. a Maximum gage height during period Jun to Oct 1903, 4.90 ft, Jun 17, 1903, site and datum then in use. b Maximum gage height since 1992, 4.32 ft, May 28, 2003, due to channel change, present site and datum.