SAN JUAN RIVER BASIN

09359020 ANIMAS RIVER BELOW SILVERTON, CO

LOCATION.--Lat 37°47'25", long 107°40'01", in SW14SW14 sec.20, T.41 N., R.7 W., San Juan County, Hydrologic Unit 14080104, on right bank 500 ft upstream from Durango-Silverton Railroad, crossing Animas River, 0.7 mi downstream from Mineral Creek, and 1.1 mi south of Silverton.

DRAINAGE AREA.--146 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1991 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09359020.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 9,200 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. Natural regulation by many lakes upstream from station. Diversions from Animas River and Mineral Creek drainages through Red Mountain, Carbon Lake and Mineral Point ditches amount to 600 to 1100 acre-feet per year. City of Silverton diverts some water for municipal use from Bear Creek and Boulder Creek, both tributaries upstream.

EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum flood known occurred 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	132	95	68	e49	42	44	67	276	1,630	358	135	145
2	149	97	e67	e50	41	e41	68	274	1,550	363	129	136
3	166	82	64	e52	e36	e43	63	277	1,280	355	123	130
4	154	80	e65	e55	e37	43	63	281	1,140	331	114	124
5	164	78	e66	e57	e39	42	62	248	896	306	108	131
6	157	78	65	57	e41	46	62	225	722	266	109	149
7	161	77	e66	e60	e42	44	60	217	681	246	112	164
8	163	78	e66	e59	e43	e44	61	207	685	242	117	150
9	158	85	e66	e57	e44	e43	66	189	709	231	105	223
10	152	85	e66	47	e46	42	84	175	700	219	106	338
11	149	81	e66	43	e47	43	101	179	678	204	115	297
12	142	83	e66	e67	e46	46	113	246	629	195	116	326
13	133	89	e66	e65	e45	51	126	343	551	186	149	392
14	127	78	e65	60	42	54	161	431	528	177	288	385
15	118	80	e65	e62	e45	52	175	542	569	168	196	356
16	112	83	e64	e60	43	52	146	574	535	173	196	341
17	108	92	60	e61	35	50	146	726	490	170	189	326
18	104	83	e58	67	36	48	143	798	479	162	173	292
19	100	92	e54	e69	37	47	129	823	485	166	156	262
20	97	75	e53	e69	38	47	130	927	484	155	139	233
21	95	80	e52	e67	38	47	147	1,030	476	149	131	210
22	96	85	e52	e67	37	48	147	1,270	492	149	125	194
23	103	85	e52	e63	41	53	138	1,410	493	142	132	182
24	102	86	e53	e62	53	56	134	1,410	474	136	139	171
25	93	77	e51	40	38	58	162	1,300	436	134	145	162
26	91	77	e49	45	37	60	219	1,410	428	135	139	153
27	94	77	e48	e47	37	61	270	1,810	427	137	144	146
28	88	e77	e47	42	39	57	301	2,040	408	154	175	139
29	92	e77	e47	44	---	56	298	2,120	385	160	169	136
30	86	e76	e48	56	---	56	287	1,860	377	159	175	130
31	91	---	e48	42	---	e63	---	1,640	---	141	163	---
TOTAL	3,777	2,468	1,823	1,741	1,145	1,537	4,129	25,258	19,817	6,269	4,512	6,523
MEAN	122	82.3	58.8	56.2	40.9	49.6	138	815	661	202	146	217
MAX	166	97	68	69	53	63	301	2,120	1,630	363	288	392
MIN	86	75	47	40	35	41	60	175	377	134	105	124
AC-FT	7,490	4,900	3,620	3,450	2,270	3,050	8,190	50,100	39,310	12,430	8,950	12,940
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1992 - 2003, BY WATER YEAR (WY)
MEAN	132	88.8	68.3	61.4	56.2	68.0	161	684	1,034	494	247	186
MAX	270	136	92.9	79.8	85.6	105	216	1,002	1,647	1,393	520	336
(WY)	(1998)	(1998)	(1998)	(1998)	(1995)	(1995)	(2000)	(1996)	(1997)	(1995)	(1995)	(1999)
MIN	75.8	46.9	50.3	40.2	40.9	49.1	122	301	232	83.0	70.5	97.5
(WY)	(2002)	(2002)	(2002)	(1992)	(2003)	(2000)	(1993)	(1995)	(2002)	(2002)	(2002)	(2001)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1992 - 2003
ANNUAL TOTAL	44,321	78,999
ANNUAL MEAN	121	216	274
HIGHEST ANNUAL MEAN			395 1997
LOWEST ANNUAL MEAN			114 2002
HIGHEST DAILY MEAN	443 May 18	2,120 May 29	2,350 Jul 10, 1995
LOWEST DAILY MEAN	e42 Feb 26	35 Feb 17	a34 Jan 30, 2000
ANNUAL SEVEN-DAY MINIMUM	42 Feb 26	37 Feb 17	37 Feb 17, 2003
MAXIMUM PEAK FLOW		2,610 May 28	2,970 Jul 9, 1995
MAXIMUM PEAK STAGE		4.27 May 28	b4.89 Jul 9, 1995
ANNUAL RUNOFF (AC-FT)	87,910	156,700	198,500
10 PERCENT EXCEEDS	286	487	760
50 PERCENT EXCEEDS	81	112	112
90 PERCENT EXCEEDS	48	44	52

e Estimated. a Also occured Nov 21, 2001. b Maximum gage height, 4.90 ft, Jun 1, 1997.