SAN JUAN RIVER BASIN

09346400 SAN JUAN RIVER NEAR CARRACAS, CO

LOCATION.--Lat 37°00'49", long 107°18'42", in SE14SW14 sec.17, T.32 N., R.4 W., Archuleta County, Hydrologic Unit 14080101, on right bank five feet above the maximum water surface of Navajo Reservoir, 3 mi northwest of Carracas, 7.2 mi upstream from Piedra River.

DRAINAGE AREA.--1,230 mi2, approximately.

PERIOD OF RECORD.--Streamflow records, October 1961 to current year. Statistical summary computed for 1971 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09346400

GAGE.--Water-stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 6,090 ft above NGVD of 1929, from river-profile map.

REMARKS.--Records good except for estimated daily discharges, which are poor. Diversions for irrigation of about 11,000 acres upstream from station. Highwater diversions upstream from station into Rio Grande basin through Azotea tunnel(station 08284160) began in March 1971. 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.--Major floods occurred Sept. 5 or 6, 1909; Oct. 5, 1911; June 29, 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	141	126	e108	e62	e78	e80	251	717	1,830	163	99	181
2	130	124	e106	e61	e78	e79	266	713	1,630	145	98	144
3	234	121	e104	e61	e74	e78	261	689	1,500	144	97	126
4	280	115	e103	e64	e71	e80	225	686	1,370	135	78	138
5	237	121	e101	e68	e71	e81	217	628	1,230	128	65	152
6	204	107	97	e70	e69	e82	209	541	1,030	123	51	171
7	175	102	93	e70	e68	87	200	483	891	114	49	213
8	165	116	90	e71	e72	100	179	422	796	102	49	201
9	152	e143	98	e73	e70	116	177	415	763	94	47	244
10	136	e137	e90	e74	e70	147	219	388	726	80	50	2,080
11	123	e119	e88	e74	e72	199	332	377	686	73	59	745
12	118	e113	e84	e71	e80	288	403	382	627	66	82	436
13	118	e117	e88	e70	e105	394	410	494	584	63	82	332
14	109	e118	e88	e72	e137	478	513	557	525	61	94	281
15	101	e108	e88	e72	e110	515	643	689	472	62	70	244
16	96	e104	e84	e71	e102	478	596	871	461	54	60	220
17	93	e105	e79	e71	e102	605	527	1,040	436	54	62	197
18	90	e106	e74	e71	e99	449	495	1,380	452	53	55	179
19	87	e106	e66	e72	e99	354	445	1,240	466	50	53	169
20	81	e111	e68	e74	102	293	384	1,270	500	46	45	150
21	80	e116	e72	e75	99	302	358	1,300	450	61	40	145
22	81	e120	e71	e77	97	315	377	1,480	373	78	37	127
23	87	e123	e74	e77	86	281	400	1,640	337	64	51	116
24	120	e119	e74	e77	80	336	359	1,720	307	54	154	114
25	130	e114	e73	e76	e82	334	361	1,670	272	58	184	99
26	122	e110	e69	e75	e84	336	437	1,670	245	52	160	93
27	168	e104	e68	e74	e85	330	556	1,740	227	49	148	91
28	160	e103	e70	e74	e84	243	673	1,890	209	109	146	88
29	146	e106	e71	e74	---	277	723	1,970	193	148	200	86
30	146	e111	e69	e74	---	247	743	1,960	178	157	196	83
31	129	---	e66	e77	---	e248	---	1,970	---	138	202	---
TOTAL	4,239	3,445	2,574	2,222	2,426	8,232	11,939	32,992	19,766	2,778	2,863	7,645
MEAN	137	115	83.0	71.7	86.6	266	398	1,064	659	89.6	92.4	255
MAX	280	143	108	77	137	605	743	1,970	1,830	163	202	2,080
MIN	80	102	66	61	68	78	177	377	178	46	37	83
AC-FT	8,410	6,830	5,110	4,410	4,810	16,330	23,680	65,440	39,210	5,510	5,680	15,160
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1971 - 2003, BY WATER YEAR (WY)
MEAN	298	239	172	155	190	574	1,030	1,687	1,700	609	330	285
MAX	932	983	406	296	481	1,369	2,524	3,195	4,039	2,427	1,004	880
(WY)	(1987)	(1987)	(1987)	(1987)	(1986)	(1995)	(1979)	(1973)	(1985)	(1995)	(1999)	(1982)
MIN	106	104	72.9	71.7	85.0	130	233	269	72.1	22.5	18.8	61.2
(WY)	(1979)	(1990)	(1990)	(2003)	(1990)	(2002)	(1977)	(2002)	(2002)	(2002)	(2002)	(1978)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1971 - 2003
ANNUAL TOTAL	41,282.80	101,121
ANNUAL MEAN	113	277	a607
HIGHEST ANNUAL MEAN			b1,191 1985
LOWEST ANNUAL MEAN			b112 2002
HIGHEST DAILY MEAN	365 May 20	2,080 Sep 10	b6,700 Mar 12, 1985
LOWEST DAILY MEAN	0.80 Sep 1	37 Aug 22	c0.80 Sep 1, 2002
ANNUAL SEVEN-DAY MINIMUM	1.3 Aug 31	49 Aug 17	1.3 Aug 31, 2002
MAXIMUM PEAK FLOW		3,510 Sep 10	d8,590 Mar 6, 1995
MAXIMUM PEAK STAGE		5.28 Sep 10	f8.10 Mar 6, 1995
ANNUAL RUNOFF (AC-FT)	81,880	200,600	439,500
10 PERCENT EXCEEDS	240	678	1,660
50 PERCENT EXCEEDS	101	118	270
90 PERCENT EXCEEDS	17	67	105

e Estimated. a Average discharge for 9 years (water years 1962-70), 632 ft3/s; 457,900 acre-ft/yr, prior to completion of Azotea tunnel. b Also the highest (or lowest, as is appropriate) for the period of record. c Also minimum daily discharge for period of record. d Maximum discharge for period of record, 9,730 ft3/s, Sep 6, 1970, gage height, 8.34 ft, from rating curve extended above 6,000 ft3/s, on basis of slope-area measurement of peak flow. f Maximum gage height for statistical period, and period of record, 9.63 ft, Jan 4, 1994, backwater from ice.