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Autostation Information

Autostation Information

DWR’s Division of Operations and Maintenance (O&M) currently maintains 16 automated water quality monitoring stations, or autostations, located throughout the State Water Project (SWP). These stations continuously monitor a variety of water quality constituents including electrical conductivity, water temperature, turbidity, pH, fluorometry, and dissolved organic carbon (calculated from UVA-254 absorption).

Our water quality monitoring stations collect data 24 hours a day, 7 days a week. Measurements of water quality parameters are taken every 5 seconds and then combined into hourly averages by onsite dataloggers. These dataloggers are then automatically polled every hour by our server in Sacramento. Once the data is downloaded to the server, each measurement is automatically compared with historical averages to gauge its accuracy, and then accurate data is transferred to the California Data Exchange Center (CDEC) website. This data is then subsequently verified by DWR scientists to ensure its validity and accuracy on a regular basis.

Sensors at these water quality stations are maintained by staff from DWR's field divisions. The staff checks each sensor on a regular basis to make sure it is properly calibrated and functioning normally. The staff also takes regular water quality "grab" samples which are analyzed at DWR's Bryte Laboratory in West Sacramento. The grab sample lab results are then used to verify the data from the automated sensors onsite at the water quality stations. More information about grab samples is available here.

Current and historic hourly and daily data can be viewed by selecting the appropriate station on our autostation map.

Information on the O&M autostation dataloggers upgrade process may be found under O&M Water Quality News & Updates.

Autostation Sensors

This table contains information on the location and water quality constituents for all autostations operated by O&M.

#

CDEC Station ID

Location
Lat
Long
County
Turb
EC
Temp
pH
UVA-254
Fluoro
1
Barker Slough Pumping Plant
38.2763
-121.7971
Solano
x
x
x
x
2
Check 13
37.0742
-121.0151
Merced
x
x
x
x
x
3
Check 21
36.0142
-119.9769
Kings
x
x
x
x
4
Check 41
34.8338
-118.7117
Kern
x
x
x
x
5
Check 66
34.336
-117.3036
San Bernardino
x
x
x
6
Clifton Court
37.8298
-121.5574
Contra Costa
x
x
x
x
x
7
Cordelia Pumping Plant
38.2276
-122.1347
Solano
x
x
x
8
Castaic Lake Outlet
34.527
-118.611
Los Angeles
x
x
x
x
9
Del Valle Conservation Outlet Works
37.6178
-121.7468
Alameda
x
x
x
x
10
Del Valle Check 7
37.6547
-121.7419
Alameda
x
x
x
x
x
11
Devil Canyon 2nd Afterbay
34.2016
-117.3375
San Bernardino
x
x
x
x
12
Dyer Reservoir
37.76184
-121.676111
Contra Costa
x
x
x
x
x
13
Banks Pumping Plant
37.8001
-121.621
Alameda
x
x
x
x
x
x
14
Pacheco Pumping Plant
37.0619
-121.1799
Merced
x
x
x
x
x
15
SBP
South Bay Pumping Plant*
37.77769
-121.624784
Contra Costa
x
x
x
x
16
Teerink Pumping Plant
35.032749
-119.008102
Kern
x
x
x
x
17
Vallecitos Turnout
37.6003
-121.8267
Alameda
x
x
x
x
    * Future station not yet operating                  


CDEC Tips for Downloading Data

Autostation data is stored in CDEC, so it is readily available to stakeholders.  The following information is designed to help navigate CDEC and retrieve desired data.  CDEC requires a station ID and a date range to retrieve hydrologic data. The three-character station IDs for O&M's autostations are provided as links in the table above.

Navigate to the station's homepage by clicking the CDEC Station ID link in the table. On the station's home page is a list of all data available from the station, including metadata and maps for the station itself.  Next, navigate to the appropriate dataset (hourly or daily) by clicking the link next to the sensor of interest.  The next page contains a data table of the relevant sensors and their readings for either the past several hours or days (depending on whether daily or hourly was selected in the previous step).  From here there are several options including: plotting the data graphically, navigating to earlier time periods of data, and clicking on an individual sensor to search for a specific date range of data.  At any point, click on the “Download Data Now” link at the bottom of the page to get an Excel readable data file of a data table (use the "Save as" option and name the file ####.xls).

Alternatively, you can use the CDEC Historical Data Selector to retrieve large blocks of data easily.  Simply enter the station ID and date range for the data you want (leave the sensor field blank to see all available data), then select the appropriate sensor from the list and download the data as stated above.

Additional CDEC guidance is available on the CDEC Support Help webpage.

Decommissioned Autostation Data

A few water quality monitoring stations have been discontinued for various reasons over the years.  The data these stations collected are still available on CDEC and can be reached using the links below.

C12: CA Aqueduct Check 12 (KA006633)

C18: CA Aqueduct Check 18 (KA014321)

C29: CA Aqueduct Check 29 (KA024454)

DVC: Devil Canyon Headworks (KA041288)

EDP: Edmontson Pumping Plant (KA029339)