PLATTE RIVER BASIN

06720820 BIG DRY CREEK AT WESTMINSTER, CO

LOCATION.--Lat 39°54'20", long 105°02'04", in NE14SE14 sec.6, T.2 S., R.68 W., Adams County, Hydrologic Unit 10190003, on left bank 0.75 mi upstream from bridge on 120th Ave., and 5.2 mi downstream from outlet of Standley Lake.

DRAINAGE AREA.--43.8 mi2.

PERIOD OF RECORD.--July 1987 to September 1995, November 1996 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06720820

REVISED RECORDS.--WDR CO-91-1: Drainage area.

GAGE.--Water-stage recorder and concrete and steel v-notched control. Elevation of gage is 5,215 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. Flow affected by storage diversions, ground-water withdrawals and diversions for irrigation and return flow from irrigated areas. 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	4.0	1.2	1.6	1.6	2.4	14	14	48	2.0	5.0	38
2	22	3.5	1.2	1.6	1.7	2.4	10	11	62	1.7	4.1	38
3	3.4	5.6	3.1	1.5	4.0	2.6	13	e10	92	2.9	6.0	37
4	2.0	3.4	1.9	1.6	3.0	1.9	14	e8.0	85	0.82	7.0	34
5	1.4	2.1	1.6	1.5	2.1	1.7	8.6	e7.0	68	0.86	6.8	34
6	1.3	1.6	1.5	1.4	1.9	1.8	29	e6.0	64	1.2	7.9	36
7	1.1	1.7	1.2	1.4	1.5	1.6	13	e5.0	69	1.3	8.1	40
8	0.89	1.4	1.1	1.6	1.6	1.5	16	e4.0	32	1.4	11	39
9	0.85	1.5	1.1	1.5	1.8	1.5	15	e6.0	29	1.5	18	34
10	0.75	1.2	1.0	1.5	1.8	1.5	10	e12	31	9.2	9.3	33
11	0.70	1.1	1.3	1.5	1.8	1.4	3.7	e10	40	4.6	8.4	22
12	0.67	1.4	1.1	1.4	1.8	1.4	2.3	e9.0	44	6.7	8.9	3.0
13	0.78	1.8	1.7	1.3	1.7	1.4	1.9	e8.5	44	7.1	13	2.4
14	0.77	1.5	1.6	1.3	1.9	1.4	1.7	e7.5	44	6.2	13	2.5
15	0.70	2.0	1.1	1.3	5.5	1.4	21	e8.0	45	6.0	14	2.7
16	0.70	2.2	1.1	1.3	5.2	1.3	8.7	9.9	48	2.0	14	2.5
17	0.75	1.3	1.0	1.2	4.3	12	3.2	7.3	49	1.6	14	2.4
18	0.79	1.6	1.0	1.3	4.4	29	3.6	5.2	89	1.3	20	2.6
19	0.74	1.5	1.1	1.3	4.3	17	54	6.3	51	2.3	27	3.4
20	0.85	1.6	1.2	1.3	4.4	38	20	7.2	45	1.6	21	3.6
21	0.80	1.4	1.3	1.4	4.2	53	8.6	9.0	73	0.87	18	3.2
22	0.67	1.1	1.3	1.4	3.2	52	11	6.8	49	0.96	16	3.0
23	0.60	1.2	1.4	1.4	2.4	71	36	4.7	51	1.9	16	3.1
24	1.00	1.7	1.3	1.5	1.9	52	62	3.1	51	1.7	16	3.3
25	0.93	2.7	1.1	1.5	1.9	61	27	3.8	52	5.4	16	2.9
26	1.8	1.9	1.0	1.5	1.8	69	15	2.1	50	5.8	16	2.3
27	2.8	1.4	1.3	1.4	2.0	59	11	11	50	8.7	19	2.0
28	2.7	1.3	1.5	1.4	2.4	23	11	28	50	6.9	43	2.0
29	9.6	1.4	1.8	1.4	---	16	8.7	54	54	7.3	46	2.1
30	5.4	1.3	1.7	1.4	---	13	11	54	51	5.5	94	2.4
31	3.5	---	1.6	1.6	---	17	---	58	---	4.4	48	---
TOTAL	72.54	57.4	42.4	44.3	76.1	609.2	464.0	396.4	1,610	111.71	584.5	436.4
MEAN	2.34	1.91	1.37	1.43	2.72	19.7	15.5	12.8	53.7	3.60	18.9	14.5
MAX	22	5.6	3.1	1.6	5.5	71	62	58	92	9.2	94	40
MIN	0.60	1.1	1.0	1.2	1.5	1.3	1.7	2.1	29	0.82	4.1	2.0
AC-FT	144	114	84	88	151	1,210	920	786	3,190	222	1,160	866
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 2003, BY WATER YEAR (WY)
MEAN	4.68	2.84	1.81	1.66	2.00	5.75	10.8	28.1	48.8	34.1	31.2	18.7
MAX	12.0	4.80	3.71	3.16	3.85	19.7	34.8	66.4	82.4	79.8	49.6	47.9
(WY)	(2000)	(2001)	(1998)	(1994)	(1993)	(2003)	(1998)	(2000)	(1999)	(1995)	(1999)	(1999)
MIN	1.55	1.33	0.88	0.76	1.00	1.30	1.52	9.98	5.32	3.60	5.17	2.64
(WY)	(1989)	(1989)	(1999)	(1995)	(1988)	(1989)	(1989)	(1989)	(2002)	(2003)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1987 - 2003
ANNUAL TOTAL	1,328.51	4,504.95
ANNUAL MEAN	3.64	12.3	15.7
HIGHEST ANNUAL MEAN			25.2 1999
LOWEST ANNUAL MEAN			3.79 2002
HIGHEST DAILY MEAN	141 May 24	94 Aug 30	232 May 5, 2001
LOWEST DAILY MEAN	0.18 Aug 27	0.60 Oct 23	0.16 Jan 12, 1995
ANNUAL SEVEN-DAY MINIMUM	0.50 Sep 2	0.72 Oct 10	0.37 Jan 6, 1995
MAXIMUM PEAK FLOW		176 Jun 18	674 Jul 13, 2001
MAXIMUM PEAK STAGE		3.21 Jun 18	a5.65 Jul 13, 2001
ANNUAL RUNOFF (AC-FT)	2,640	8,940	11,370
10 PERCENT EXCEEDS	9.5	45	48
50 PERCENT EXCEEDS	1.5	3.0	3.3
90 PERCENT EXCEEDS	0.75	1.2	1.1

e Estimated. a Maximum gage height, 6.08 ft, Aug 4, 1997.