SAN JUAN RIVER BASIN

09352900 VALLECITO CREEK NEAR BAYFIELD, CO

(Hydrologic Benchmark Station)

LOCATION.--Lat 37°28'39", long 107°32'35", in NE14NW14 sec.16, T.37 N., R.6 W., La Plata County, Hydrologic Unit 14080101, on right bank 60 ft upstream from Fall Creek, 0.8 mi downstream from Bear Creek, 6.7 mi north of Vallecito Dam, and 18 mi north of Bayfield.

DRAINAGE AREA.--72.5 mi2.

PERIOD OF RECORD.--October 1962 to current year. Daily record for water temperature available, November 1962 to September 1982. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09352900

REVISED RECORDS.--WDR CO-00-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry and concrete control. Datum of gage is 7,906.08 ft above NGVD of 1929.

REMARKS.--Records good except for estimated daily discharges, which are poor. No diversion upstream from station.

EXTREMES OUTSIDE PERIOD OF RECORD.--Major floods occurred in October 1911 and June 1927.

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	71	47	32	e12	e14	17	46	186	553	100	67	105
2	78	46	33	e12	e16	20	51	178	497	97	64	92
3	91	41	30	e11	18	e18	46	173	414	93	60	85
4	90	44	30	e10	20	e15	43	172	351	89	e58	80
5	99	40	e30	e10	e18	e14	42	149	311	84	e56	82
6	96	40	e27	e10	e16	e14	40	136	264	79	e46	85
7	104	40	e24	e11	e13	e14	38	128	227	73	46	85
8	109	43	e22	e11	e11	e13	37	116	231	71	88	76
9	107	46	e18	e10	e10	e14	43	106	227	68	77	147
10	102	47	e17	e10	e11	e17	61	97	219	64	82	377
11	95	46	e15	e11	e11	e19	83	97	199	61	72	235
12	88	42	e13	e12	e11	26	93	135	186	59	70	239
13	82	47	e12	e12	e11	31	99	189	170	56	65	262
14	77	43	e13	e12	e14	35	128	209	156	54	115	229
15	71	42	e12	e12	e14	32	140	269	165	51	85	186
16	67	42	e12	e12	16	33	119	246	162	54	92	162
17	63	40	e13	e11	16	32	119	399	142	56	84	141
18	59	44	e15	e11	16	31	115	406	138	52	77	122
19	56	41	e16	e10	16	29	104	339	160	58	76	109
20	53	39	e16	e9.6	18	28	96	381	172	55	67	96
21	50	38	e15	e11	15	29	98	481	150	54	62	88
22	49	40	e14	e12	e16	29	96	759	147	59	59	81
23	54	42	e14	e14	e16	33	92	785	147	51	61	75
24	55	41	e14	e15	e14	38	89	675	137	44	68	70
25	50	39	e14	18	e12	38	104	578	122	43	78	66
26	51	37	e14	17	e12	40	146	579	118	41	87	60
27	54	37	e14	e16	e15	40	181	828	117	56	92	57
28	50	38	e12	e14	17	37	203	944	114	64	115	54
29	51	35	e8.8	e14	---	38	201	917	107	89	112	52
30	48	35	e7.5	e14	---	36	191	694	105	92	134	49
31	48	---	e10	e14	---	e40	---	627	---	73	135	---
TOTAL	2,218	1,242	537.3	378.6	407	850	2,944	11,978	6,208	2,040	2,450	3,647
MEAN	71.5	41.4	17.3	12.2	14.5	27.4	98.1	386	207	65.8	79.0	122
MAX	109	47	33	18	20	40	203	944	553	100	135	377
MIN	48	35	7.5	9.6	10	13	37	97	105	41	46	49
AC-FT	4,400	2,460	1,070	751	807	1,690	5,840	23,760	12,310	4,050	4,860	7,230
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1963 - 2003, BY WATER YEAR (WY)
MEAN	78.0	44.2	27.2	20.7	19.8	34.1	111	401	506	237	136	115
MAX	280	104	52.0	42.5	44.5	80.8	226	697	927	596	442	455
(WY)	(1973)	(1987)	(1986)	(1986)	(1986)	(1989)	(1989)	(2001)	(1980)	(1995)	(1999)	(1970)
MIN	22.3	16.7	9.89	9.51	8.42	9.11	40.3	132	64.1	27.5	27.5	25.1
(WY)	(1979)	(1976)	(1977)	(1977)	(1977)	(1977)	(1964)	(2002)	(2002)	(2002)	(2002)	(1978)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1963 - 2003
ANNUAL TOTAL	18,079.0	34,899.9
ANNUAL MEAN	49.5	95.6	145
HIGHEST ANNUAL MEAN			226 1973
LOWEST ANNUAL MEAN			43.9 2002
HIGHEST DAILY MEAN	400 Sep 11	944 May 28	3,020 Sep 6, 1970
LOWEST DAILY MEAN	6.6 Feb 8	e7.5 Dec 30	6.6 Feb 8, 2002
ANNUAL SEVEN-DAY MINIMUM	7.7 Feb 6	10 Dec 29	7.4 Dec 23, 1976
MAXIMUM PEAK FLOW		1,610 May 28	a7,050 Sep 6, 1970
MAXIMUM PEAK STAGE		2.76 May 28	b6.51 Sep 6, 1970
ANNUAL RUNOFF (AC-FT)	35,860	69,220	104,700
10 PERCENT EXCEEDS	107	194	409
50 PERCENT EXCEEDS	33	54	60
90 PERCENT EXCEEDS	11	12	17

e Estimated. a From rating curve extended above 1,400 ft3/s, on basis of slope-area measurement of peak flow. b Maximum gage height, 6.51 ft, from water-stage recorder, 6.76 ft, from floodmarks.