GUNNISON RIVER BASIN

09147000 DALLAS CREEK NEAR RIDGWAY, CO

LOCATION.--Lat 38°10'40", long 107°45'28", on line between sec.4 and 5, T.45 N., R.8 W., Ouray County, Hydrologic Unit 14020006, on right bank 20 ft downstream from county road bridge, 1.5 mi upstream from mouth, and 1.5 mi northwest of Ridgway.

DRAINAGE AREA.--97.2 mi2.

PERIOD OF RECORD.--March 1922 to October 1927, October 1955 to September 1971, October 1979 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09147000

REVISED RECORDS.--WSP 1924: 1960. WDR CO-88-2: Drainage area.

GAGE.--Water stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 6,980 ft above NGVD of 1929, from topographic map. Mar. 1, 1922 to Oct. 31, 1927, nonrecording gage at different datum.

REMARKS.--Records good except for estimated daily discharges, which are poor. Diversions upstream from station for irrigation of about 4,500 acres upstream from and 700 acres downstream from station. One small ditch imports water from Leopard Creek (Dolores River basin) to drainage 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.

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	26	22	20	e16	15	13	30	4.3	87	5.0	47	45
2	29	22	22	e15	14	e15	36	3.8	86	5.3	37	38
3	43	18	19	e16	12	17	32	2.7	81	12	34	34
4	32	20	20	e16	e14	13	25	2.8	81	15	31	30
5	33	17	17	e16	e16	13	22	2.7	71	15	29	29
6	30	18	20	15	e15	14	23	2.5	46	16	26	33
7	30	19	22	e15	e15	14	23	2.0	34	16	24	43
8	29	20	22	e16	e15	16	20	1.9	30	12	25	44
9	29	37	e21	e15	e15	e22	25	2.1	29	11	21	123
10	27	28	e21	14	e14	e26	33	2.1	26	8.4	19	192
11	25	24	e21	14	e15	e27	60	2.0	24	11	17	90
12	25	19	22	14	e15	e30	96	2.4	23	16	18	66
13	25	21	20	e15	e15	33	114	2.1	19	18	19	63
14	25	21	e20	e16	e17	26	93	2.0	15	22	75	63
15	25	21	16	16	e15	28	71	2.1	18	21	54	57
16	25	21	19	e16	14	26	50	2.0	18	21	57	53
17	26	24	14	e15	14	22	62	2.0	16	22	74	52
18	27	21	14	e15	14	20	55	1.9	14	20	66	52
19	26	20	16	e16	13	18	51	2.8	15	21	37	49
20	25	23	e18	e16	15	16	46	1.8	15	19	30	44
21	22	21	e17	e16	13	20	45	4.3	12	18	26	41
22	22	20	e19	e15	13	17	54	7.0	13	21	24	41
23	22	20	e18	16	e16	21	41	8.5	16	26	23	39
24	22	19	e17	14	14	25	27	11	13	26	22	35
25	22	20	e17	13	13	29	33	35	9.1	24	25	28
26	23	18	e17	15	13	25	33	32	8.0	23	22	26
27	25	20	e16	15	e15	24	30	32	8.6	22	25	22
28	23	e22	e17	14	12	19	20	64	6.4	24	35	20
29	25	23	e16	14	---	15	13	94	6.0	42	44	17
30	24	24	e16	15	---	16	7.9	94	7.5	37	43	15
31	23	---	e16	14	---	21	---	85	---	48	42	---
TOTAL	815	643	570	468	401	641	1,270.9	514.8	847.6	617.7	1,071	1,484
MEAN	26.3	21.4	18.4	15.1	14.3	20.7	42.4	16.6	28.3	19.9	34.5	49.5
MAX	43	37	22	16	17	33	114	94	87	48	75	192
MIN	22	17	14	13	12	13	7.9	1.8	6.0	5.0	17	15
AC-FT	1,620	1,280	1,130	928	795	1,270	2,520	1,020	1,680	1,230	2,120	2,940
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1922 - 2003, BY WATER YEAR (WY)
MEAN	25.6	24.4	20.1	17.8	18.7	25.6	57.5	49.0	59.4	72.6	57.7	39.6
MAX	65.1	39.1	33.9	32.0	32.0	59.4	183	249	171	230	141	117
(WY)	(1985)	(1926)	(1924)	(1924)	(1924)	(1985)	(1985)	(1984)	(1984)	(1983)	(1983)	(1927)
MIN	2.07	14.4	13.4	9.61	11.9	14.8	4.13	0.67	1.49	0.75	3.95	2.58
(WY)	(1957)	(1957)	(1994)	(1980)	(1994)	(1980)	(1990)	(1981)	(2002)	(2002)	(2002)	(1956)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1922 - 2003
ANNUAL TOTAL	5,606.42	9,344.0
ANNUAL MEAN	15.4	25.6	38.8
HIGHEST ANNUAL MEAN			86.4 1984
LOWEST ANNUAL MEAN			13.8 1990
HIGHEST DAILY MEAN	103 Sep 11	192 Sep 10	740 May 3, 1924
LOWEST DAILY MEAN	0.48 May 17	1.8 May 20	0.21 Jun 19, 1981
ANNUAL SEVEN-DAY MINIMUM	0.58 Jun 25	2.1 May 12	0.38 May 11, 1981
MAXIMUM PEAK FLOW		1,170 Sep 9	a3,960 Jul 31, 1999
MAXIMUM PEAK STAGE		b5.79 Sep 9	c8.42 Jul 31, 1999
ANNUAL RUNOFF (AC-FT)	11,120	18,530	28,130
10 PERCENT EXCEEDS	29	47	88
50 PERCENT EXCEEDS	16	21	24
90 PERCENT EXCEEDS	0.68	12	11

e Estimated. a On basis of slope-area measurement of peak flow. b From crest-stage gage. c From high water mark.