SAN JUAN RIVER BASIN

09358550 CEMENT CREEK AT SILVERTON, CO

LOCATION.--Lat 37°49'11", long 107°39'47", in SW14SW14 sec.8, T.41 N., R.7 W., San Juan County, Hydrologic Unit 14080104, on left bank, at abandoned railroad crossing Cement Creek, 0.1 mile north of Silverton, and 0.8 mile upstream from mouth.

DRAINAGE AREA.--20.1 mi2.

PERIOD OF RECORD.--October 1991 to September 1993, October 1994 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09358550

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 9,380 ft above NGVD of 1929, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor. Natural regulation by many lakes upstream from station. Diversions for mining operations upstream from station. However, these diversions are returned to the creek upstream of the gage. Mine drainage contributes considerable amounts of water to the creek. 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.

EXTREMES OUTSIDE PERIOD OF RECORD.--A major flood occurred October 5, 1911. A more recent flood occurred June 6, 1978, when Lake Emma (6.5 mi northeast of Silverton) was undermined by mining operations, and released a large quantity of water into the headwaters of Cement Creek. Discharge not determined.

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	19	16	e13	e8.0	e8.7	e8.4	18	53	196	36	16	14
2	20	16	e13	e8.2	e8.7	e8.5	17	49	194	35	16	14
3	21	15	e13	e8.3	e8.7	e8.6	15	48	168	35	16	14
4	22	15	e13	e8.4	e8.7	e8.7	14	48	146	33	16	14
5	22	15	e13	e8.5	e8.8	e8.9	14	40	129	30	15	15
6	21	15	e13	e8.5	e8.9	e9.0	14	35	116	28	16	16
7	21	15	13	e8.5	e8.9	e9.2	14	33	109	26	16	18
8	21	16	13	e8.5	e8.9	e9.4	13	31	109	24	16	15
9	20	16	e11	e8.5	e9.0	e9.7	16	28	108	23	15	25
10	19	15	e11	e8.5	e9.1	e10	22	26	104	22	16	36
11	19	15	e10	e8.6	e9.3	e12	27	29	99	21	e15	33
12	18	14	e9.7	e8.8	e8.7	13	28	42	86	20	e14	38
13	18	15	e8.5	e9.0	e8.4	14	32	55	73	20	19	35
14	17	15	e8.2	e9.3	e8.2	14	38	70	71	19	20	31
15	17	15	e8.0	e9.3	e8.1	14	35	77	75	18	16	29
16	17	13	e8.0	e9.5	e7.9	13	28	85	69	19	20	27
17	17	15	e8.0	e9.7	e7.7	13	29	122	60	19	18	25
18	16	14	e8.0	e9.8	e7.5	13	29	119	56	18	17	23
19	15	14	e8.0	e10	e7.6	12	24	107	56	19	16	e22
20	16	14	e7.9	e11	e7.7	12	25	118	55	17	15	e21
21	16	15	e7.8	e13	e7.7	12	28	137	53	17	15	20
22	16	16	e7.8	e12	e7.8	13	26	170	55	17	15	19
23	16	16	e7.7	e11	e8.0	14	23	194	55	17	18	18
24	15	15	e7.6	e10	e8.1	15	23	202	50	17	16	17
25	15	15	e7.6	e9.8	e8.2	15	32	166	46	17	15	17
26	16	14	e7.6	e9.3	e8.3	15	47	167	45	16	15	16
27	16	14	e7.6	e9.2	e8.3	15	60	205	44	17	15	16
28	15	e14	e7.6	e8.9	e8.3	13	65	239	42	17	16	15
29	16	e14	e7.6	e8.7	---	e15	59	237	40	17	15	15
30	14	e13	e7.7	e8.7	---	e17	55	218	39	16	18	15
31	16	---	e7.9	e8.7	---	e17	---	203	---	16	15	---
TOTAL	547	444	294.8	288.2	234.2	381.4	870	3,353	2,548	666	501	633
MEAN	17.6	14.8	9.51	9.30	8.36	12.3	29.0	108	84.9	21.5	16.2	21.1
MAX	22	16	13	13	9.3	17	65	239	196	36	20	38
MIN	14	13	7.6	8.0	7.5	8.4	13	26	39	16	14	14
MED	17	15	8.0	8.9	8.3	13	26	85	70	19	16	18
AC-FT	1,080	881	585	572	465	757	1,730	6,650	5,050	1,320	994	1,260
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1992 - 2003, BY WATER YEAR (WY)
MEAN	18.7	16.1	13.0	12.1	12.1	15.3	29.3	101	125	54.0	26.2	21.7
MAX	28.9	19.8	15.6	15.8	17.8	22.7	42.1	145	263	149	50.7	34.6
(WY)	(1998)	(1999)	(1995)	(1995)	(1995)	(1995)	(2000)	(1996)	(1995)	(1995)	(1999)	(1999)
MIN	14.0	12.7	9.26	8.27	8.36	12.3	22.6	37.3	24.6	13.2	12.9	16.9
(WY)	(1992)	(2002)	(2002)	(2002)	(2003)	(2003)	(1998)	(2002)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1992 - 2003
ANNUAL TOTAL	6,364.3	10,760.6
ANNUAL MEAN	17.4	29.5	37.1
HIGHEST ANNUAL MEAN			56.3 1995
LOWEST ANNUAL MEAN			17.0 2002
HIGHEST DAILY MEAN	50 May 20	239 May 28	385 Jun 16, 1995
LOWEST DAILY MEAN	e7.6 Dec 24	e7.5 Feb 18	a,e7.5 Jan 2, 1992
ANNUAL SEVEN-DAY MINIMUM	7.6 Dec 23	7.6 Dec 23	e7.6 Dec 23, 2002
MAXIMUM PEAK FLOW		300 May 28	471 Jun 14, 1995
MAXIMUM PEAK STAGE		2.26 May 28	2.85 Jun 14, 1995
ANNUAL RUNOFF (AC-FT)	12,620	21,340	26,850
10 PERCENT EXCEEDS	33	60	95
50 PERCENT EXCEEDS	14	16	18
90 PERCENT EXCEEDS	8.2	8.4	11

e Estimated. a Also occurred Feb 18, 2003.