SAN JUAN RIVER BASIN

09353800 LOS PINOS RIVER NEAR IGNACIO, CO

LOCATION.--Lat 37°09'58", long 107°34'57", in NW14NW14 sec.26, T.34 N., R.7 W., La Plata County, Hydrologic Unit 14080101, on right bank 1.7 mi downstream from Pine River Canal, 2.2 mi upstream from Beaver Creek and 5.2 mi northeast of Ignacio.

DRAINAGE AREA.--340 mi2.

PERIOD OF RECORD.--October 1999 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09353800

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 6,630 ft above NGVD of 1929, from topographic map.

REMARKS.--Records good except for estimated daily discharges, which are poor. Flow regulated by Vallecito Reservoir (station 09353000, capacity 125,640 acre ft.) 14 mi upstream since April 1941. Diversions for irrigation of about 2,040 acres upstream and about 40,040 acres downstream from the station. Some waste water is diverted to adjacent basins. 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.

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	7.1	17	12	e6.6	e8.5	10	28	6.1	7.4	3.6	1.2	18
2	11	16	12	e6.5	e8.6	10	31	16	6.8	2.4	4.6	5.5
3	13	14	12	e6.5	e8.4	10	30	23	7.5	1.5	9.0	3.1
4	12	16	12	e6.5	8.0	11	25	11	6.6	3.7	4.3	3.0
5	11	16	11	e6.5	8.1	11	24	8.5	5.5	3.3	1.3	3.9
6	9.8	15	11	e6.5	8.6	10	24	12	5.2	2.4	1.4	7.9
7	7.2	12	11	e6.5	8.0	11	22	7.3	6.2	4.1	1.3	8.8
8	2.9	7.8	11	e6.5	9.0	12	21	4.9	6.5	1.3	1.8	4.5
9	2.6	24	e10	e6.5	11	14	18	15	5.6	2.5	4.0	133
10	2.5	15	e9.9	e6.5	12	15	20	e20	8.5	8.3	9.9	71
11	3.0	9.0	e9.4	e6.6	11	18	22	e14	10	8.1	4.3	21
12	4.1	7.3	e9.4	e6.7	11	25	23	e8.0	6.6	10	2.9	9.4
13	3.7	6.4	e9.4	e6.9	12	29	25	7.9	3.6	9.7	3.3	6.0
14	4.2	5.6	e9.3	e7.2	15	32	24	17	6.6	8.3	4.0	5.2
15	4.0	5.2	e7.8	e7.3	13	31	27	31	6.8	3.3	1.5	4.1
16	17	5.0	e7.6	e7.8	10	38	29	22	5.2	1.5	7.2	4.3
17	21	5.6	e7.3	e7.9	9.5	51	29	7.1	11	2.4	24	3.6
18	9.8	5.3	e7.5	e8.1	10	43	28	3.8	13	3.0	17	3.1
19	13	5.1	7.5	e8.1	9.7	38	22	3.5	20	1.2	7.1	3.4
20	28	6.7	e7.3	e8.2	9.3	32	17	5.1	12	0.92	2.9	4.4
21	16	12	e7.2	e8.2	9.1	34	14	5.5	8.8	1.2	2.4	5.5
22	18	14	e7.2	e8.2	8.7	33	14	9.7	2.9	1.4	7.4	5.9
23	22	15	e7.1	e8.3	8.8	33	16	14	2.0	1.5	1.7	5.4
24	24	15	e7.0	e8.3	8.8	40	16	27	1.9	1.0	3.3	5.7
25	24	16	e6.9	8.3	10	42	13	21	1.1	1.8	3.0	6.1
26	21	15	6.8	7.8	12	44	17	60	2.8	1.1	2.8	6.8
27	28	14	e6.9	e8.3	11	41	16	26	1.8	1.2	6.7	7.9
28	22	11	e6.6	e8.3	11	35	18	6.2	1.3	2.4	8.8	7.4
29	22	11	e6.6	e8.4	---	31	16	3.7	1.1	3.4	7.8	7.5
30	21	11	e6.6	e8.4	---	30	13	6.3	1.6	5.1	22	7.2
31	18	---	e6.6	e8.5	---	29	---	5.1	---	1.3	22	---
TOTAL	422.9	348.0	269.9	230.9	280.1	843	642	427.7	185.9	102.92	200.9	388.6
MEAN	13.6	11.6	8.71	7.45	10.0	27.2	21.4	13.8	6.20	3.32	6.48	13.0
MAX	28	24	12	8.5	15	51	31	60	20	10	24	133
MIN	2.5	5.0	6.6	6.5	8.0	10	13	3.5	1.1	0.92	1.2	3.0
AC-FT	839	690	535	458	556	1,670	1,270	848	369	204	398	771
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 2000 - 2003, BY WATER YEAR (WY)
MEAN	48.2	22.5	26.5	26.6	25.2	72.7	165	90.3	70.7	10.3	13.6	12.9
MAX	120	31.6	46.3	45.0	36.9	188	531	298	253	24.2	36.4	17.1
(WY)	(2000)	(2002)	(2002)	(2002)	(2000)	(2001)	(2001)	(2001)	(2001)	(2001)	(2001)	(2001)
MIN	13.6	11.6	8.71	7.45	10.0	24.0	17.6	12.0	6.20	3.32	2.31	8.28
(WY)	(2003)	(2003)	(2003)	(2003)	(2003)	(2002)	(2002)	(2002)	(2003)	(2003)	(2002)	(2000)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 2000 - 2003
ANNUAL TOTAL	5,822.46	4,342.82
ANNUAL MEAN	16.0	11.9	48.7
HIGHEST ANNUAL MEAN			123 2001
LOWEST ANNUAL MEAN			11.9 2003
HIGHEST DAILY MEAN	61 Jan 22	133 Sep 9	1,040 Jun 12, 2001
LOWEST DAILY MEAN	e0.33 Aug 16	0.92 Jul 20	0.33 Aug 16, 2002
ANNUAL SEVEN-DAY MINIMUM	1.1 Aug 15	1.3 Jul 20	1.1 Aug 15, 2002
MAXIMUM PEAK FLOW		449 Sep 9	1,100 Jun 12, 2001
MAXIMUM PEAK STAGE		4.08 Sep 9	4.95 Jun 12, 2001
ANNUAL RUNOFF (AC-FT)	11,550	8,610	35,290
10 PERCENT EXCEEDS	33	25	67
50 PERCENT EXCEEDS	12	8.4	22
90 PERCENT EXCEEDS	2.5	2.8	4.0

e Estimated.