WILLIAMS FORK BASIN

09034900 BOBTAIL CREEK NEAR JONES PASS, CO

LOCATION.--Lat 39°45'37", long 105°54'21", in sec.28, T.3 S., R.76 W., Grand County, Hydrologic Unit 14010001, on left bank 320 ft upstream from diversion dam and 0.4 mi south of entrance to August P. Gumlick Tunnel.

DRAINAGE AREA.--5.49 mi2.

PERIOD OF RECORD.--October 1965 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09034900

GAGE.--Water-stage recorder. Elevation of gage is 10,430 ft above NGVD of 1929, from topographic map.

REMARKS.--Records good except for estimated daily discharges, which are poor. No diversion 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	2.8	e1.3	e1.5	e1.2	e1.1	e0.79	e0.99	e3.3	120	52	10	8.6
2	3.1	e1.3	e1.6	e1.2	e1.3	e0.79	e1.5	e3.3	97	51	8.9	7.8
3	3.1	e1.3	e1.4	e1.2	e1.3	e0.79	e1.9	e3.2	83	49	10	8.6
4	2.7	e1.3	e1.3	e1.2	e1.1	e0.79	e2.1	e3.5	72	47	8.4	7.8
5	2.6	e1.3	e1.1	e1.2	e1.1	e0.79	e2.1	e3.7	64	44	7.7	8.0
6	2.6	e1.3	e1.1	e1.1	e1.0	e0.93	e2.1	e3.9	53	41	7.5	11
7	2.8	e1.3	e1.1	e0.92	e0.96	e1.0	e2.1	e3.9	46	37	8.7	13
8	2.7	e1.3	e0.92	e0.82	e0.96	e1.0	e2.1	e3.6	45	35	8.4	13
9	2.6	e1.3	e0.92	e0.89	e0.93	e1.1	e2.1	e3.6	55	34	7.9	20
10	2.4	e1.4	e0.92	e0.89	e0.84	e1.1	e2.1	e3.5	67	32	7.1	18
11	2.2	e1.4	e0.92	e0.86	e0.84	e1.1	e2.2	e3.5	71	28	6.5	17
12	e2.0	e1.4	e0.92	e0.86	e0.99	e1.1	e2.5	e3.5	70	26	6.3	15
13	e2.0	e1.4	e1.1	e0.86	e0.99	e1.1	e2.7	e5.4	66	25	6.1	14
14	e1.7	e1.4	e1.3	e0.86	e0.99	e1.2	e3.1	e5.5	72	24	5.7	13
15	e1.5	e1.3	e1.4	e0.86	e1.2	e1.2	e2.6	e5.8	79	25	5.5	11
16	e1.4	e1.3	e1.5	e0.86	e1.3	e1.2	e2.4	e12	74	27	12	10
17	e1.5	e1.3	e1.5	e0.86	e1.3	e1.0	e2.2	e21	73	28	15	9.2
18	e1.5	e1.7	e1.5	e0.86	e1.4	e0.86	e2.0	e24	75	27	21	8.8
19	e1.4	e1.7	e1.4	e0.86	e1.4	e0.86	e1.8	e25	78	27	15	8.0
20	e1.4	e1.6	e1.3	e0.86	e1.4	e0.89	e1.2	24	76	28	13	7.4
21	e1.7	e1.5	e1.2	e0.86	e1.4	e0.89	e1.3	25	75	24	11	6.8
22	e1.8	e1.5	e1.1	e0.86	e1.4	e0.89	e1.8	32	72	22	9.7	6.4
23	e1.8	e1.5	e0.98	e0.86	e1.3	e0.92	e1.5	41	73	20	11	6.0
24	e1.7	e1.3	e0.92	e0.98	e1.2	e0.92	e1.5	46	67	16	9.7	5.6
25	e1.7	e1.1	e0.92	e0.98	e1.2	e0.96	e1.4	51	59	17	10	5.2
26	e1.6	e1.1	e0.92	e0.80	e1.1	e0.93	e1.7	56	55	18	9.2	4.9
27	e1.6	e1.1	e0.92	e0.71	e1.0	e0.80	e1.8	65	55	17	8.2	4.7
28	e1.5	e1.3	e1.1	e0.61	e0.70	e0.62	e1.9	85	55	14	7.7	4.5
29	e1.4	e1.2	e1.2	e0.62	---	e0.62	e3.0	101	55	13	8.2	4.3
30	e1.3	e1.4	e1.2	e0.62	---	e0.63	e3.3	110	54	12	11	4.1
31	e1.3	---	e1.2	e1.1	---	e0.71	---	127	---	11	10	---
TOTAL	61.4	40.6	36.36	28.22	31.70	28.48	60.99	904.2	2,056	871	296.4	281.7
MEAN	1.98	1.35	1.17	0.91	1.13	0.92	2.03	29.2	68.5	28.1	9.56	9.39
MAX	3.1	1.7	1.6	1.2	1.4	1.2	3.3	127	120	52	21	20
MIN	1.3	1.1	0.92	0.61	0.70	0.62	0.99	3.2	45	11	5.5	4.1
AC-FT	122	81	72	56	63	56	121	1,790	4,080	1,730	588	559
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1966 - 2003, BY WATER YEAR (WY)
MEAN	2.97	1.73	1.10	0.88	0.80	0.78	1.48	15.5	56.3	29.3	9.43	4.71
MAX	5.49	3.33	1.79	1.24	1.15	1.21	4.30	32.6	85.8	75.5	25.5	9.74
(WY)	(1985)	(1984)	(1983)	(1983)	(1995)	(1995)	(1969)	(2000)	(1997)	(1995)	(1983)	(1983)
MIN	1.51	1.03	0.78	0.58	0.48	0.52	0.68	1.57	20.1	4.74	3.39	2.35
(WY)	(1981)	(1974)	(1977)	(1972)	(1972)	(1972)	(1973)	(1995)	(2002)	(2002)	(2002)	(1987)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1966 - 2003
ANNUAL TOTAL	1,698.72	4,697.05
ANNUAL MEAN	4.65	12.9	10.4
HIGHEST ANNUAL MEAN			15.5 1984
LOWEST ANNUAL MEAN			4.80 2002
HIGHEST DAILY MEAN	39 Jun 1	127 May 31	146 Jun 25, 1983
LOWEST DAILY MEAN	e0.75 Mar 3	e0.61 Jan 28	0.44 Feb 11, 1972
ANNUAL SEVEN-DAY MINIMUM	e0.79 Feb 27	e0.75 Mar 25	0.46 Feb 11, 1972
MAXIMUM PEAK FLOW		197 May 31	290 Jun 28, 1988
MAXIMUM PEAK STAGE		4.96 May 31	a5.19 Jun 28, 1988
ANNUAL RUNOFF (AC-FT)	3,370	9,320	7,560
10 PERCENT EXCEEDS	13	51	33
50 PERCENT EXCEEDS	2.0	2.0	2.0
90 PERCENT EXCEEDS	0.89	0.89	0.72

e Estimated. a Maximum gage height, 7.57 ft, May 15, 1984, backwater from ice.