ARKANSAS RIVER BASIN

07126485 PURGATOIRE RIVER AT ROCK CROSSING NEAR TIMPAS, CO

LOCATION.--Lat 37°37'06', long 103°35'35" in NE14SE14 sec. 10, T.28 S., R.55 W., Las Animas County, Hydrologic Unit 11020010, on right bank at Rock Crossing, 2.1 mi upstream from Minnie Canyon, 2.4 mi downstream from Beaty Canyon, and 17 mi southeast of Timpas.

DRAINAGE AREA.--2,635 mi2, of which 11.8 mi2 is noncontributing.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--June 1983 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07126485

REVISED RECORD.--WDR CO-87-1: 1984-86 (M). WDR CO-01-1: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry and crest-stage gages. Elevation of gage is 4,350 ft above NGVD of 1929, from topographic map.
June 1, 1983 to July 17, 1985, at site 500 ft downstream at same datum.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by storage reservoirs, diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants. Peak flows are regulated to some extent by Trinidad Lake (station 07124400) 92 mi upstream.

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	4.2	0.92	4.6	e11	11	11	35	31	20	3.8	5.1	0.21
2	3.4	0.92	4.6	e12	10	12	32	23	58	2.6	2.5	0.15
3	2.9	0.85	5.0	13	9.2	12	74	18	26	5.8	1.4	7.5
4	2.3	0.82	5.6	12	8.1	12	198	14	15	7.0	0.84	14
5	2.0	0.80	5.5	12	7.1	13	133	13	16	6.4	0.54	7.1
6	1.6	0.77	5.6	11	7.1	13	73	12	138	3.9	0.27	19
7	1.5	0.76	6.0	11	6.5	13	55	10	124	2.4	0.09	192
8	1.3	0.74	11	11	6.4	12	43	8.8	81	1.7	0.00	241
9	1.2	0.98	9.2	11	6.7	12	37	8.0	71	1.2	465	133
10	1.1	1.4	7.4	11	6.9	11	32	7.4	67	0.83	253	44
11	0.91	1.4	6.7	11	7.1	11	28	7.0	63	0.56	61	23
12	0.85	1.5	6.8	11	7.6	10	24	6.5	68	0.38	20	14
13	0.78	1.9	6.6	10	8.6	9.9	20	6.0	66	0.20	9.3	11
14	0.74	2.0	7.1	9.7	10	9.4	33	5.5	40	0.08	4.9	7.2
15	0.68	2.4	6.9	9.1	12	9.3	46	5.8	21	0.01	2.9	8.8
16	0.67	3.1	6.8	8.9	13	9.1	44	6.0	14	5.3	1.8	19
17	0.66	3.2	6.5	9.3	12	10	32	5.4	52	1.2	1.3	14
18	0.66	2.8	e6.6	9.0	13	18	34	4.5	25	0.47	0.90	9.6
19	0.66	3.7	e6.6	9.7	14	19	28	4.8	122	0.23	0.66	6.4
20	0.67	4.3	e6.7	8.3	14	25	23	4.5	43	0.16	0.46	4.7
21	0.66	4.7	e6.6	8.1	13	24	19	4.2	30	0.02	0.31	3.5
22	0.66	4.6	e6.7	8.1	13	24	33	4.1	32	0.00	0.21	2.6
23	0.60	4.6	e6.8	9.3	e12	31	147	3.7	22	0.00	1.8	2.1
24	0.68	4.6	e6.8	11	e12	37	378	3.4	25	0.00	1.5	1.7
25	0.72	4.6	e6.8	10	e11	123	220	43	17	0.00	0.92	1.4
26	0.74	4.3	e7.3	11	e11	194	116	17	11	0.00	0.61	1.1
27	1.1	4.1	e7.6	11	e10	199	76	41	12	0.00	0.39	0.87
28	0.96	3.9	e8.3	11	9.9	208	66	22	9.9	0.00	0.25	0.70
29	0.82	3.9	8.5	11	---	96	57	12	11	0.00	0.20	0.61
30	0.80	3.8	8.4	11	---	60	43	7.7	5.8	0.00	0.26	1.1
31	0.83	---	8.5	11	---	45	---	41	---	6.0	0.25	---
TOTAL	37.35	78.36	214.1	323.5	282.2	1,292.7	2,179	400.3	1,305.7	50.24	838.66	791.34
MEAN	1.20	2.61	6.91	10.4	10.1	41.7	72.6	12.9	43.5	1.62	27.1	26.4
MAX	4.2	4.7	11	13	14	208	378	43	138	7.0	465	241
MIN	0.60	0.74	4.6	8.1	6.4	9.1	19	3.4	5.8	0.00	0.00	0.15
AC-FT	74	155	425	642	560	2,560	4,320	794	2,590	100	1,660	1,570
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2003, BY WATER YEAR (WY)
MEAN	39.7	38.0	32.3	30.7	33.1	44.4	85.2	121	95.9	71.3	113	47.3
MAX	89.1	68.3	43.4	41.4	56.0	139	330	585	836	186	468	124
(WY)	(1999)	(1999)	(1998)	(1984)	(1988)	(1998)	(1993)	(1987)	(1983)	(1992)	(1999)	(2002)
MIN	1.20	2.61	6.91	10.4	10.1	15.7	8.23	1.34	7.23	1.62	24.4	12.5
(WY)	(2003)	(2003)	(2003)	(2003)	(2003)	(2002)	(2002)	(2002)	(2001)	(2003)	(2001)	(1990)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1983 - 2003
ANNUAL TOTAL	9,001.93	7,793.45
ANNUAL MEAN	24.7	21.4	59.5
HIGHEST ANNUAL MEAN			123 1987
LOWEST ANNUAL MEAN			21.4 2003
HIGHEST DAILY MEAN	1,220 Sep 10	465 Aug 9	4,190 May 2, 1999
LOWEST DAILY MEAN	0.00 Jun 1	0.00 Jul 22	a0.00 Jun 30, 1990
ANNUAL SEVEN-DAY MINIMUM	0.00 Jun 1	0.00 Jul 22	0.00 Jun 30, 1990
MAXIMUM PEAK FLOW		2,050 Aug 9	b11,400 Jul 9, 1992
MAXIMUM PEAK STAGE		11.55 Aug 9	c17.90 Jul 9, 1992
ANNUAL RUNOFF (AC-FT)	17,860	15,460	43,100
10 PERCENT EXCEEDS	23	45	105
50 PERCENT EXCEEDS	6.0	7.6	33
90 PERCENT EXCEEDS	0.00	0.66	9.4

e Estimated. a Also occurred many days during water years 1990, 2002-2003. b From slope-area measurement of peak flow. c From floodmarks.