ARKANSAS RIVER BASIN

07105945 ROCK CREEK ABOVE FORT CARSON RESERVATION, CO

LOCATION.--Lat 38°42'27", long 104°50'46", in NW14NW14 sec.36, T.15 S., R.67 W., El Paso County, Hydrologic Unit 11020003, on right bank 20 ft upstream from county road bridge, 0.6 mi northwest of Rock Creek Park, 1.2 mi upstream from State Highway 115, and 3.2 mi southwest of Fort Carson Military Reservation.

DRAINAGE AREA.--6.79 mi2.

PERIOD OF RECORD.--May 1978 to current year. Water-quality data available, April 1978 to August 1979. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07105945

REVISED RECORDS.--WDR CO-85-1: 1982 (M).

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 6,390 ft above NGVD of 1929, from topographic map. Prior to Oct. 10, 1997, at site 50 ft downstream.

REMARKS.--Records fair except for estimated daily discharges, which are poor. 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	0.02	0.15	e0.21	0.13	0.13	0.24	3.3	3.0	1.5	0.66	0.22	1.4
2	0.01	0.15	e0.22	0.13	0.15	0.21	5.5	2.8	1.5	0.57	0.21	0.93
3	0.02	0.17	e0.23	0.14	0.14	0.23	6.1	2.6	1.2	0.50	0.23	0.84
4	0.04	0.16	e0.24	0.16	0.12	0.26	5.3	2.5	1.2	0.47	0.33	0.80
5	0.06	0.16	e0.25	0.17	0.15	0.26	4.6	2.3	1.4	0.41	0.25	0.62
6	0.06	0.14	e0.26	0.17	e0.10	0.31	4.0	2.1	1.6	0.37	0.23	0.59
7	0.06	0.15	0.26	0.17	e0.10	0.39	3.6	1.9	1.4	0.35	0.18	1.2
8	0.06	0.20	0.26	0.13	e0.10	0.46	3.1	1.8	1.3	0.31	0.16	0.84
9	0.04	0.32	0.26	0.07	e0.11	0.55	3.1	1.7	1.1	0.28	0.24	0.71
10	0.03	0.30	0.26	0.05	e0.11	0.65	3.4	1.7	1.1	0.25	0.20	0.57
11	0.03	0.29	0.26	0.07	0.13	0.78	3.8	1.5	1.0	0.23	0.20	0.50
12	0.02	0.29	0.25	0.08	0.15	0.90	4.5	1.3	0.93	0.22	0.71	0.43
13	0.02	0.24	0.24	0.08	0.18	0.98	5.5	1.2	1.1	0.21	0.35	0.38
14	0.02	0.20	0.23	0.08	0.23	1.2	5.9	1.1	1.3	0.20	0.26	0.42
15	0.02	0.22	0.20	0.07	0.26	1.3	5.8	1.1	1.2	e0.50	0.22	0.33
16	0.02	0.22	0.20	0.07	0.24	1.4	5.3	1.1	1.1	e0.40	0.18	0.23
17	0.02	0.21	0.20	0.08	0.25	1.4	4.8	1.0	1.1	0.26	0.15	0.20
18	0.02	0.19	0.19	0.07	0.27	2.0	4.3	0.88	0.99	0.18	0.14	0.18
19	0.01	0.20	0.19	0.07	0.25	1.7	4.0	0.82	1.1	0.14	0.16	0.16
20	0.00	0.20	0.13	0.08	0.25	1.7	3.6	0.90	1.8	0.15	0.11	0.15
21	0.00	0.17	0.20	0.08	0.29	1.9	3.3	0.82	1.5	0.13	0.09	0.12
22	0.00	0.17	0.17	0.09	0.28	2.0	3.1	0.76	1.2	0.11	0.08	0.11
23	0.02	0.19	0.16	0.08	e0.25	2.6	3.2	0.76	1.1	0.11	0.07	0.09
24	0.02	0.20	e0.12	0.09	e0.10	3.5	3.2	1.1	0.99	0.09	0.06	0.07
25	0.04	0.20	e0.10	0.10	e0.15	4.1	3.1	7.2	0.94	0.07	0.05	0.07
26	0.06	0.19	e0.12	0.10	0.26	5.0	3.0	2.6	1.0	0.05	0.03	0.05
27	0.17	e0.18	0.14	0.12	0.25	6.0	3.1	2.2	0.88	0.04	0.01	0.04
28	0.24	e0.18	0.14	0.12	0.26	4.4	3.2	1.8	0.78	0.09	0.00	0.03
29	0.22	e0.18	0.16	0.12	---	2.9	3.3	1.4	0.79	0.23	0.00	0.02
30	0.24	e0.20	0.15	0.12	---	2.8	3.3	1.2	0.72	0.31	0.05	0.02
31	0.19	---	0.14	0.12	---	2.7	---	1.2	---	0.27	2.5	---
TOTAL	1.78	6.02	6.14	3.21	5.26	54.82	121.3	54.34	34.82	8.16	7.67	12.10
MEAN	0.057	0.20	0.20	0.10	0.19	1.77	4.04	1.75	1.16	0.26	0.25	0.40
MAX	0.24	0.32	0.26	0.17	0.29	6.0	6.1	7.2	1.8	0.66	2.5	1.4
MIN	0.00	0.14	0.10	0.05	0.10	0.21	3.0	0.76	0.72	0.04	0.00	0.02
AC-FT	3.5	12	12	6.4	10	109	241	108	69	16	15	24
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 2003, BY WATER YEAR (WY)
MEAN	1.39	0.93	0.48	0.45	0.47	1.00	4.65	10.1	4.97	1.79	3.04	1.18
MAX	20.7	10.7	2.25	1.42	1.33	2.56	20.7	39.1	32.7	7.23	18.1	7.75
(WY)	(1985)	(1985)	(1985)	(1985)	(1985)	(1998)	(1999)	(1995)	(1997)	(1985)	(1999)	(1982)
MIN	0.000	0.028	0.051	0.073	0.12	0.27	0.26	0.095	0.015	0.010	0.000	0.000
(WY)	(1979)	(1979)	(1979)	(1979)	(1979)	(2002)	(2002)	(2002)	(2002)	(1978)	(1978)	(1978)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1978 - 2003
ANNUAL TOTAL	48.94	315.62
ANNUAL MEAN	0.13	0.86	2.58
HIGHEST ANNUAL MEAN			7.70 1985
LOWEST ANNUAL MEAN			0.14 2002
HIGHEST DAILY MEAN	3.2 Jul 3	7.2 May 25	397 Apr 30, 1999
LOWEST DAILY MEAN	0.00 Jun 13	0.00 Oct 20	a0.00 Jul 6, 1978
ANNUAL SEVEN-DAY MINIMUM	0.00 Jun 13	0.01 Oct 16	0.00 Jul 6, 1978
MAXIMUM PEAK FLOW		40 May 25	b770 Jun 10, 1997
MAXIMUM PEAK STAGE		3.38 May 25	c9.71 Jun 10, 1997
ANNUAL RUNOFF (AC-FT)	97	626	1,870
10 PERCENT EXCEEDS	0.28	3.0	5.4
50 PERCENT EXCEEDS	0.11	0.24	0.62
90 PERCENT EXCEEDS	0.00	0.06	0.14

e Estimated. a No flow on many days during many years. b From rating curve extended above 133 ft3/s on basis of width-contraction measurement of peak flow at gage height 5.28 ft. c From floodmark, site then in use.