BLUE RIVER BASIN

09047700 KEYSTONE GULCH NEAR DILLON, CO

LOCATION.--Lat 39°35'40", long 105°58'19", in NE14NE14 sec.26, T.5 S., R.77 W., Summit County, Hydrologic Unit 14010002, on right bank 0.7 mi upstream from mouth, and 4.7 mi southeast of Dillon.

DRAINAGE AREA.--9.10 mi2.

PERIOD OF RECORD.--October 1957 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09047700

REVISED RECORDS.--WSP 2124: Drainage area.

GAGE.--Water-stage recorder. Elevation of gage is 9,350 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. No known 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	1.6	e1.9	e2.1	e2.1	e2.2	e1.9	e2.1	4.0	e84	12	4.9	e5.6
2	1.9	e1.9	e2.1	e2.1	e2.2	e2.0	e2.1	3.6	e76	12	4.9	e5.5
3	2.3	e1.9	e2.2	e2.1	e2.1	e2.0	e2.4	3.6	e69	10	5.1	e5.5
4	1.9	e1.9	e2.2	e2.1	e2.1	e2.1	e2.5	4.0	e56	8.2	4.9	e5.5
5	1.8	e2.0	e2.2	e2.1	e2.1	e2.1	e2.4	3.5	e49	7.5	4.8	e5.5
6	1.7	e2.0	e2.2	e2.1	e2.1	e2.1	e2.2	3.4	e45	7.2	4.8	e5.3
7	1.7	e2.0	e2.2	e2.1	e2.1	e2.1	e2.2	3.3	e42	6.9	4.6	e4.9
8	1.7	e2.0	e2.2	e2.1	e2.1	e2.1	e2.1	3.4	e38	6.7	4.6	e4.8
9	1.6	e2.0	e2.2	e2.1	e2.1	e2.1	e2.2	3.4	e38	6.4	4.6	e4.6
10	1.5	e2.1	e2.3	e2.1	e2.1	e2.1	e2.4	3.5	e38	6.8	4.4	4.1
11	1.6	e2.2	e2.2	e2.1	e2.1	e2.1	e2.4	3.4	e39	6.9	4.3	4.0
12	1.6	e2.3	e2.2	e2.1	e2.1	e2.1	e2.6	3.9	e39	6.6	4.3	3.8
13	1.3	e2.3	e2.1	e2.1	e2.1	e2.0	e2.8	5.3	e39	6.3	4.2	3.8
14	1.4	e2.3	e2.1	e2.1	e2.1	e2.0	e2.8	6.7	e37	6.2	4.0	3.7
15	1.4	e2.5	e2.1	e2.1	e2.1	e2.0	e2.9	7.5	e35	6.0	3.9	3.6
16	1.4	e2.5	e2.1	e2.1	e2.1	e2.0	e3.0	10	e34	6.2	4.5	3.5
17	1.4	e2.6	e2.1	e2.1	e2.1	e2.0	e2.9	13	e29	7.0	5.3	3.4
18	1.4	e2.6	e2.1	e2.2	e2.1	e2.0	e2.9	15	e25	e7.2	6.0	3.3
19	1.6	e2.6	e2.1	e2.2	e2.1	e2.0	e2.8	16	25	e7.4	5.2	3.4
20	1.5	e2.6	e2.1	e2.2	e2.1	e2.0	e2.7	e17	23	e7.6	4.4	3.3
21	1.6	e2.6	e2.1	e2.2	e2.1	e2.0	e2.7	e18	22	e7.1	5.2	3.2
22	1.9	e2.5	e2.1	e2.2	e2.1	e2.0	e2.6	e22	20	e6.5	5.7	3.4
23	1.9	e2.4	e2.1	e2.2	e2.1	e2.0	e2.5	e26	19	e6.3	6.0	e3.4
24	1.7	e2.3	e2.1	e2.2	e2.1	e2.0	2.8	e32	18	e6.0	5.9	e3.3
25	2.0	e2.2	e2.1	e2.2	e2.1	e2.0	2.8	e36	18	e5.9	6.7	e3.3
26	2.0	e2.2	e2.1	e2.2	e2.0	e2.0	2.9	e36	17	5.7	7.3	e3.2
27	1.9	e2.2	e2.1	e2.2	e1.9	e2.0	3.6	e37	16	5.6	6.7	e3.2
28	2.2	e2.1	e2.1	e2.2	e1.9	e2.0	4.0	e43	15	5.3	6.5	e3.1
29	e1.9	e2.1	e2.1	e2.2	---	e2.0	4.5	e55	14	5.1	6.0	e3.1
30	e1.9	e2.1	e2.1	e2.2	---	e2.1	4.4	e64	13	5.1	e6.1	e3.1
31	e1.9	---	e2.1	e2.2	---	e2.1	---	e86	---	5.0	e6.0	---
TOTAL	53.2	66.9	66.2	66.5	58.5	63.0	83.2	588.5	1,032	214.7	161.8	119.4
MEAN	1.72	2.23	2.14	2.15	2.09	2.03	2.77	19.0	34.4	6.93	5.22	3.98
MAX	2.3	2.6	2.3	2.2	2.2	2.1	4.5	86	84	12	7.3	5.6
MIN	1.3	1.9	2.1	2.1	1.9	1.9	2.1	3.3	13	5.0	3.9	3.1
AC-FT	106	133	131	132	116	125	165	1,170	2,050	426	321	237
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1958 - 2003, BY WATER YEAR (WY)
MEAN	3.33	3.02	2.58	2.25	2.08	2.09	3.13	13.0	24.4	9.96	5.22	3.73
MAX	6.12	4.38	3.75	2.97	2.90	3.00	6.19	40.8	58.8	31.2	15.5	7.97
(WY)	(1985)	(2000)	(2002)	(2002)	(1997)	(1986)	(1986)	(1996)	(1995)	(1995)	(1984)	(1984)
MIN	1.72	1.77	1.37	1.39	1.40	1.40	1.44	3.90	2.54	1.51	1.33	1.42
(WY)	(2003)	(1964)	(1964)	(1964)	(1961)	(1973)	(1973)	(2002)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1958 - 2003
ANNUAL TOTAL	813.11	2,573.9
ANNUAL MEAN	2.23	7.05	6.24
HIGHEST ANNUAL MEAN			13.1 1984
LOWEST ANNUAL MEAN			2.65 2002
HIGHEST DAILY MEAN	4.8 Apr 30	e86 May 31	153 Jun 18, 1995
LOWEST DAILY MEAN	0.86 Aug 18	1.3 Oct 13	0.86 Aug 18, 2002
ANNUAL SEVEN-DAY MINIMUM	0.94 Sep 1	1.4 Oct 12	0.94 Sep 1, 2002
MAXIMUM PEAK FLOW		a	b311 Jun 17, 1995
MAXIMUM PEAK STAGE		a	3.47 Jun 17, 1995
ANNUAL RUNOFF (AC-FT)	1,610	5,110	4,520
10 PERCENT EXCEEDS	3.5	17	14
50 PERCENT EXCEEDS	2.1	2.4	3.0
90 PERCENT EXCEEDS	1.2	2.0	1.9

e Estimated. a Not determined. b From rating curve extended above 65 ft3/s.