SAN JUAN RIVER BASIN

09339900 EAST FORK SAN JUAN RIVER ABOVE SAND CREEK, NEAR PAGOSA SPRINGS, CO

LOCATION.--Lat 37°23'23", long 106°50'26", in NE14 sec.4, T.36 N., R.1 E., Archuleta County, Hydrologic Unit 14080101, on right bank 0.3 mi upstream from Sand Creek, 4.0 mi upstream from West Fork San Juan River, and 13 mi northeast of Pagosa Springs.

DRAINAGE AREA.--64.1 mi2.

PERIOD OF RECORD.--October 1956 to September 1996, October 1998 to September 2003 (discontinued). Prior to October 1959, published as San Juan River above Sand Creek, near Pagosa Springs. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09339900

REVISED RECORDS.--WSP 1713: 1957.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 7,940 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. Diversions upstream from station for irrigation of about 500 acres of hay meadows upstream from station. 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.--Greatest flood since at least 1885 occurred Oct. 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	16	12	14	e11	e12	e12	31	121	321	47	29	22
2	23	12	14	e11	e12	e11	37	119	302	45	33	22
3	36	11	13	e11	e12	e11	31	121	290	43	30	24
4	28	12	e12	e11	e11	e11	27	119	271	40	24	23
5	27	11	e12	e11	e11	e11	26	98	250	37	21	24
6	23	10	e12	e11	e11	e11	26	88	212	34	19	45
7	22	11	e12	e11	e11	e12	24	83	191	32	19	38
8	21	12	e11	e11	e11	e12	26	75	179	30	19	31
9	20	15	e11	e11	e11	e12	28	68	178	28	18	102
10	19	16	e11	e11	e11	e14	44	64	176	26	21	210
11	18	14	e11	e11	e11	e15	63	63	169	25	22	104
12	17	13	e11	e11	e12	e17	70	78	156	24	22	74
13	16	13	e11	e11	e14	e21	75	98	140	23	20	62
14	16	14	e11	e11	e15	e22	98	109	121	21	18	54
15	16	14	e11	e11	e13	e22	111	146	113	21	17	47
16	15	13	e11	e11	e12	e23	88	155	108	21	18	41
17	15	14	e11	e11	e12	22	86	216	98	22	17	37
18	15	14	e11	e11	e12	25	76	252	97	20	17	33
19	14	14	e10	e11	e12	25	67	247	99	20	16	31
20	14	14	e11	e11	e12	23	64	252	100	23	15	28
21	14	15	e11	e11	e11	21	81	269	90	20	15	26
22	14	15	e11	e11	e11	20	76	295	85	19	15	25
23	16	16	e11	e11	e11	22	68	306	80	19	23	23
24	16	15	e11	e11	e11	26	59	310	74	19	30	22
25	14	15	e11	e11	e11	27	67	309	68	17	24	21
26	14	14	e11	e11	e12	29	89	297	63	18	22	20
27	15	e13	e11	e11	e12	28	111	331	59	20	19	19
28	14	e13	e11	e11	e12	26	132	362	57	29	22	18
29	14	e13	e11	e11	---	26	139	366	53	36	30	18
30	13	e14	e11	e11	---	25	135	359	51	31	33	18
31	13	---	e11	e11	---	e28	---	350	---	28	30	---
TOTAL	548	402	352	341	329	610	2,055	6,126	4,251	838	678	1,262
MEAN	17.7	13.4	11.4	11.0	11.8	19.7	68.5	198	142	27.0	21.9	42.1
MAX	36	16	14	11	15	29	139	366	321	47	33	210
MIN	13	10	10	11	11	11	24	63	51	17	15	18
AC-FT	1,090	797	698	676	653	1,210	4,080	12,150	8,430	1,660	1,340	2,500
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 - 2003, BY WATER YEAR (WY)
MEAN	33.9	22.0	14.1	11.8	12.8	27.1	103	291	320	111	54.2	42.6
MAX	107	74.9	30.3	21.7	24.6	62.9	248	520	788	395	177	207
(WY)	(1987)	(1987)	(1987)	(1973)	(1995)	(1986)	(1985)	(1984)	(1957)	(1957)	(1999)	(1970)
MIN	8.39	8.31	4.68	5.00	5.66	8.86	29.2	50.8	29.1	10.5	7.80	10.6
(WY)	(1957)	(1961)	(1959)	(1959)	(1990)	(1977)	(1977)	(2002)	(2002)	(2002)	(2002)	(1978)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1957 - 2003
ANNUAL TOTAL	6,838.0	17,792
ANNUAL MEAN	18.7	48.7	87.2
HIGHEST ANNUAL MEAN			155 1985
LOWEST ANNUAL MEAN			18.3 2002
HIGHEST DAILY MEAN	69 May 21	366 May 29	1,180 May 27, 1993
LOWEST DAILY MEAN	6.1 Sep 6	10 Nov 6	3.4 Dec 26, 1958
ANNUAL SEVEN-DAY MINIMUM	6.6 Aug 26	11 Dec 13	3.7 Dec 13, 1958
MAXIMUM PEAK FLOW		413 May 30	a2,260 Sep 14, 1970
MAXIMUM PEAK STAGE		4.43 May 30	6.75 Sep 14, 1970
ANNUAL RUNOFF (AC-FT)	13,560	35,290	63,180
10 PERCENT EXCEEDS	42	121	264
50 PERCENT EXCEEDS	12	20	28
90 PERCENT EXCEEDS	8.7	11	10

e Estimated. a From rating curve extended above 460 ft3/s, on basis of slope-area measurement at gage height, 6.13 ft.