SAN JUAN RIVER BASIN

09342500 SAN JUAN RIVER AT PAGOSA SPRINGS, CO

LOCATION.--Lat 37°15'58", long 107°00'37", in NE14SW14 sec.13, T.35 N., R.2 W., Archuleta County, Hydrologic Unit 14080101, on right bank at former bridge site in Pagosa Springs, 0.2 mi upstream from McCabe Creek, 0.6 mi downstream from bridge on U.S. Highway 160, and 2.0 mi upstream from Mill Creek.

DRAINAGE AREA.--298 mi2.

PERIOD OF RECORD.--October 1910 to December 1914, May 1935 to current year. Monthly discharge only for some periods, published in WSP 1313. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09342500

REVISED RECORDS.--WSP 1313: 1914(M).

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 7,052.04 ft above NGVD of 1929. Jan. 29 to Mar. 6, 1911, nonrecording gage at site 0.5 mi upstream, at different datum. Mar. 7 to Oct. 4, 1911, nonrecording gage at present site, at different datum. Nov. 23, 1911 to Nov. 14, 1914, nonrecording gage at site 300 ft upstream, at different datum.

REMARKS.--Records good except for Sept. 24-30, those above 2,040 ft3/s and estimated daily discharges, which are poor. Diversions for irrigation of large areas 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.--Maximum stage known since at least 1885, that of Oct. 5, 1911. Flood of June 29, 1927, reached a stage of 13.5 ft, discharge about 16,000 ft3/s, from information by local residents.

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	60	54	58	36	42	40	e144	531	1,730	129	58	80
2	74	53	50	30	42	37	181	506	1,500	118	52	66
3	164	50	52	33	41	38	142	524	1,410	108	57	78
4	115	50	49	34	37	39	119	512	1,300	102	53	74
5	118	51	46	34	33	37	113	414	1,100	97	53	69
6	90	50	44	37	40	35	106	349	890	92	43	104
7	84	55	40	33	31	39	96	314	765	82	42	109
8	80	60	41	33	35	41	85	286	694	73	41	90
9	76	85	37	35	36	45	105	256	680	63	43	308
10	72	92	35	40	33	51	174	242	654	53	45	1,020
11	67	69	36	38	34	63	280	224	611	49	51	455
12	63	57	27	36	38	86	327	289	561	47	50	305
13	58	62	31	32	55	113	323	403	518	46	54	241
14	57	62	33	36	76	132	441	435	452	44	50	195
15	56	60	36	37	60	126	520	647	420	40	43	161
16	53	48	40	33	49	141	389	690	421	42	45	140
17	50	52	39	33	44	131	392	998	385	45	48	125
18	48	50	40	32	45	106	356	1,200	372	48	49	115
19	47	48	29	36	41	e121	304	1,080	376	47	44	102
20	46	53	28	36	40	e117	262	1,120	414	47	41	97
21	46	59	38	38	40	e111	275	1,180	346	48	35	88
22	45	63	31	41	36	e120	284	1,370	308	42	36	73
23	52	69	38	41	34	e166	285	1,600	282	40	37	70
24	60	64	38	40	38	e187	253	1,620	251	43	81	64
25	56	61	37	39	39	e191	292	1,570	220	41	77	61
26	55	54	34	36	41	e184	416	1,530	200	37	83	56
27	70	55	30	38	43	136	530	1,670	185	40	67	54
28	64	47	33	38	42	112	606	1,920	171	52	66	55
29	61	51	36	37	---	95	660	2,040	153	66	102	51
30	56	50	36	39	---	93	626	2,020	137	80	95	48
31	54	---	33	41	---	e101	---	1,930	---	52	113	---
TOTAL	2,097	1,734	1,175	1,122	1,165	3,034	9,086	29,470	17,506	1,913	1,754	4,554
MEAN	67.6	57.8	37.9	36.2	41.6	97.9	303	951	584	61.7	56.6	152
MAX	164	92	58	41	76	191	660	2,040	1,730	129	113	1,020
MIN	45	47	27	30	31	35	85	224	137	37	35	48
AC-FT	4,160	3,440	2,330	2,230	2,310	6,020	18,020	58,450	34,720	3,790	3,480	9,030
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1936 - 2003, BY WATER YEAR (WY)
MEAN	145	93.9	64.1	55.1	61.7	147	552	1,273	1,304	385	181	151
MAX	937	399	160	107	142	442	1,210	2,665	3,066	1,515	740	859
(WY)	(1942)	(1987)	(1987)	(1986)	(1995)	(1986)	(1985)	(1941)	(1957)	(1941)	(1999)	(1970)
MIN	23.3	33.6	27.5	26.8	29.2	50.3	141	158	56.6	15.5	13.5	18.8
(WY)	(1957)	(1956)	(1990)	(1990)	(1964)	(1964)	(1977)	(2002)	(2002)	(2002)	(2002)	(1956)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1936 - 2003
ANNUAL TOTAL	22,073.7	74,610
ANNUAL MEAN	60.5	204	368
HIGHEST ANNUAL MEAN			730 1941
LOWEST ANNUAL MEAN			59.0 2002
HIGHEST DAILY MEAN	235 Apr 15	2,040 May 29	4,640 May 13, 1941
LOWEST DAILY MEAN	8.3 Aug 28	27 Dec 12	a8.3 Aug 28, 2002
ANNUAL SEVEN-DAY MINIMUM	8.7 Aug 28	33 Dec 27	8.7 Aug 28, 2002
MAXIMUM PEAK FLOW		2,580 May 30	25,000 Oct 5, 1911
MAXIMUM PEAK STAGE		4.99 May 30	b17.80 Oct 5, 1911
ANNUAL RUNOFF (AC-FT)	43,780	148,000	266,800
10 PERCENT EXCEEDS	142	522	1,140
50 PERCENT EXCEEDS	41	60	107
90 PERCENT EXCEEDS	14	36	42

e Estimated. a Also occurred Sep 3, 2002. b From floodmarks.