ROARING FORK RIVER BASIN

09073400 ROARING FORK RIVER NEAR ASPEN, CO

LOCATION.--Lat 39°10'48", long 106°48'05", T. 10 S., R. 84 W., Pitkin County, Hydrologic Unit 14010004, on right bank 25 ft upstream from private bridge, 115 ft upstream from Salvation ditch headgate, 1.0 mi southeast of Aspen, and 2.0 mi upstream from Hunter Creek.

DRAINAGE AREA.--108 mi2.

PERIOD OF RECORD.--October 1964 to current year.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 8,014.01 ft above NGVD of 1929. Prior to Apr. 25, 1968, at site 85 ft upstream, at datum 1.16 ft higher.

REMARKS.--Records good except for estimated daily discharges, which are poor. Transmountain diversion 14 mi upstream through Twin Lakes tunnel to Arkansas River basin since May 24, 1935, (45,240 acre-ft diverted during current year, provided by Colorado Division of Water Resources). 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	41	26	23	21	20	20	25	69	832	107	36	32
2	35	25	23	20	20	19	28	65	568	102	35	29
3	36	22	22	21	20	19	28	62	454	95	35	29
4	33	21	25	21	18	21	28	65	411	87	37	30
5	33	22	23	21	20	20	26	61	354	82	35	29
6	30	18	23	20	e15	20	28	55	304	78	34	32
7	28	20	25	21	e14	20	27	55	280	74	33	49
8	27	23	23	23	e17	20	24	57	264	69	49	49
9	27	24	20	22	19	20	26	55	277	64	49	44
10	26	21	20	20	20	20	31	58	290	61	47	52
11	25	22	20	21	20	21	37	54	280	58	45	54
12	23	21	21	21	19	22	42	60	270	55	51	49
13	22	22	21	21	20	22	43	84	295	53	53	49
14	24	25	22	22	21	23	55	98	257	52	50	42
15	22	24	21	21	20	24	54	136	258	51	47	39
16	22	21	24	e18	20	24	46	167	247	51	50	39
17	21	23	21	20	21	24	49	225	228	49	58	36
18	21	24	21	21	20	24	49	247	228	47	60	52
19	20	22	20	20	19	23	45	245	234	44	64	71
20	20	23	e18	21	18	22	42	241	220	42	38	68
21	20	24	21	20	20	24	42	240	206	42	32	56
22	21	23	20	20	20	23	45	277	192	40	31	54
23	24	23	e16	20	20	23	45	319	182	39	33	52
24	22	24	e18	20	20	25	41	349	168	40	32	49
25	23	24	20	20	21	25	43	372	156	38	30	50
26	22	19	20	19	21	23	51	363	144	38	35	45
27	25	20	20	20	20	24	58	429	137	69	42	44
28	24	22	21	20	20	22	64	546	129	45	38	43
29	24	24	21	19	---	20	72	752	119	48	34	42
30	21	24	20	19	---	23	75	916	112	39	33	40
31	26	---	20	20	---	24	---	756	---	36	34	---
TOTAL	788	676	653	633	543	684	1,269	7,478	8,096	1,795	1,280	1,349
MEAN	25.4	22.5	21.1	20.4	19.4	22.1	42.3	241	270	57.9	41.3	45.0
MAX	41	26	25	23	21	25	75	916	832	107	64	71
MIN	20	18	16	18	14	19	24	54	112	36	30	29
AC-FT	1,560	1,340	1,300	1,260	1,080	1,360	2,520	14,830	16,060	3,560	2,540	2,680
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1965 - 2003, BY WATER YEAR (WY)
MEAN	43.6	34.8	29.8	26.7	25.5	27.5	49.0	198	415	194	68.6	51.0
MAX	80.0	61.6	47.5	44.6	41.1	44.3	79.7	554	1,017	1,057	186	94.0
(WY)	(1966)	(1985)	(1987)	(1997)	(1997)	(1997)	(1985)	(1984)	(1984)	(1995)	(1995)	(1999)
MIN	23.5	20.7	18.6	17.0	15.4	16.6	26.2	97.0	77.8	46.5	25.7	23.8
(WY)	(1978)	(1978)	(1977)	(1977)	(1977)	(1977)	(1973)	(1983)	(2002)	(2002)	(2002)	(1977)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1965 - 2003
ANNUAL TOTAL	14,493	25,244
ANNUAL MEAN	39.7	69.2	a150
HIGHEST ANNUAL MEAN			229 1984
LOWEST ANNUAL MEAN			41.0 2002
HIGHEST DAILY MEAN	166 May 31	916 May 30	1,900 Jul 10, 1995
LOWEST DAILY MEAN	e16 Dec 23	e14 Feb 7	12 Nov 28, 1976
ANNUAL SEVEN-DAY MINIMUM	19 Dec 19	18 Feb 3	15 Feb 1, 1977
MAXIMUM PEAK FLOW		1,090 May 30	b2,230 Jul 11, 1995
MAXIMUM PEAK STAGE		4.11 May 30	5.97 Jul 11, 1995
ANNUAL RUNOFF (AC-FT)	28,750	50,070	a108,700
10 PERCENT EXCEEDS	90	198	244
50 PERCENT EXCEEDS	24	28	40
90 PERCENT EXCEEDS	20	20	22

e Estimated. a Includes diversions through Twin Lakes Tunnel. b Also occurred Jun 9, 1985.