VCPWA-Watershed Protection Hydrologic Data Server

Welcome to Ventura County Watershed Protection District Hydrologic Data Webpage. This page provides rain, stream, and evaporation data from the District's official gages in Ventura County, as well as other available data used in District planning studies.

Due to the complexity of the website and datasets, we STRONGLY urge you to read our file explaining how to download data from this website and any associated caveats by clicking on: Hydrodata Web Questions. Please read the file before you contact us with any questions regarding this site or our data sets.

For certified data or non-standard data not available on this website, please send a data request to the Hydrology Section as outlined in Hydrodata Web Questions document.

Official and Preliminary data are available by water year clicking on the station name and by selecting the water year and format selectors for each dataset. Additional Supplimental Reports for specific stations are available for download from each station's drop-down menus.

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Station 152 Information

Site Id: 152 Station Name: Piedra Blanca Guard Station Latitude: 34° 33' 37.7" N Longitude: 119° 10' 1.3" W Datum: World Geodetic System 1984 Elevation: 3065 feet Station Type: Recording Precip Gage VCWPD Zone: Zone 2 (Santa Clara River) NCDC Site Id: None Currently Active: Yes Associated Station(s): none

Available Datasets

Dataset Name	Publish Type	Start Date		End Date
Evaporation: Monthly Totals	Published Data	10/01/1951 00:00	-	10/01/1977 00:00
Rainfall: Daily Totals	Published Data	09/30/1949 08:00	-	09/30/2018 08:00
	Preliminary Data	09/30/2018 08:00	-	10/05/2020 08:00
	Unverified Telemetry Data			11/22/2024 08:00
Rainfall: Hourly Totals	Published Data	04/20/1959 14:00	-	09/30/2018 08:00
	Preliminary Data	09/30/2018 08:00	-	10/05/2020 12:00
	Unverified Telemetry Data			11/22/2024 15:00

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Base Period Normal Monthly and Seasonal Precipitation**

Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Season
0.51	2.98	3.34	4.47	5.89	4.29	1.83	0.29	0.02	0.01	0.13	0.45	24.22

Notes: **Base Period Normal is the October 1957 to September 1992 average. This average was selected since it is the best 35 year period that represents the long term average for multiple sites in Ventura County.

Interactive Chart for Period of Record

Circle Chart for Period of Record

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Summary of Historic Wettest and Driest Years and Effects of El Niño/La Nina

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Official and Supplemental Reports Published for This Station

Official Reports - Click Download button to download file
Select Report:	Rainfall Frequency Long Duration-Draft.pdf Rainfall Frequency Short Duration-Draft.pdf

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Evaporation: Monthly Totals

Publish Type	Start Date		End Date
Published Data:	10/01/1951 00:00	-	10/01/1977 00:00
Unverifed Telemetry Data:	N/A

Monthly Evaporation - Multiple Water Year Products
Select Water Year Range:	1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 to 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
Formatted Monthly Report:	Web Formatted Report (HTML)
Data Download: Select Format:	Web Formatted Table (HTML) Comma Separated File (CSV) XML Data Format File

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Rainfall: Daily Totals

Publish Type	Start Date		End Date
Published Data:	09/30/1949 08:00	-	09/30/2018 08:00
Preliminary Data:	09/30/2018 08:00	-	10/05/2020 08:00
Unverifed Telemetry Data:			11/22/2024 08:00

Daily Rainfall - Water Year Products
Select Water Year:	1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Formatted Daily Report:	Web Formatted Report (HTML)
Data Download: Select Format:	Web Formatted Table (HTML) Comma Separated File (CSV) JSON Data Format File XML Data Format File
For Daily Rainfall Plot:
Monthly Rainfall - Multiple Water Year Products
Select Water Year Range:	1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 to 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Formatted Monthly Report:	Web Formatted Report (HTML)
Data Download: Select Format:	Web Formatted Table (HTML) Comma Separated File (CSV) JSON Data Format File XML Data Format File

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Rainfall: Hourly Totals

Publish Type	Start Date		End Date
Published Data:	04/20/1959 14:00	-	09/30/2018 08:00
Preliminary Data:	09/30/2018 08:00	-	10/05/2020 12:00
Unverifed Telemetry Data:			11/22/2024 15:00

Monthly Products
Select Month / Year:	January February March April May June July August September October November December 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Formatted Hourly Report:	Web Formatted Report (HTML)
Data Download: Select Format:	Web Formatted Table (HTML) Comma Separated File (CSV) JSON Data Format File XML Data Format File
Entire Water Year Products
Select Water Year:	1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Data Download: Select Format:	Web Formatted Table (HTML) Comma Separated File (CSV) JSON Data Format File XML Data Format File

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Obsolete Reports and Data Files

Warning: These files are obsolete and should be used only if the data are not available from above choises.

Select a compiled dataset or summary from the list and click Download: Dataset:

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Data marked with 'P' are preliminary and subject to change until checked and evaluated. Data marked with 'U' are unverified and are subject to changed and evaluated. Unverified data may contain errors that have not been checked by Hydrology staff. Ventura County does not guarantee the accuracy of these data; please note that river flows may vary considerably during each day and from day to day.Oficial published data are marked with 'A '.