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Sacramento-San Joaquin Delta
Surface Water

North Central Region Office
Department of Water Resources

(916) 376-9600

Street Address:

3500 Industrial Blvd.
West Sacramento, CA 95691

Mailing Address:

PO Box 942836
Sacramento, CA 94236




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 Sacramento-San Joaquin Delta

Tide Monitoring

The Surface Water Unit operates over 50 continuous recording stations in the Delta. The stations gather information utilized by the Department to assist decision makers and planners in demonstrating compliance with water quality requirements, flood monitoring, as well as design and water transporting needs. The Delta data is also used by many local agencies, communities, universities, private interest groups, and interested land owners.

The Delta is influenced by tidal action from the Pacific Ocean and as such the data is processed and generally presented in the format of four daily tides (two ebb and two flood), along with the corresponding times they occur. Since the normal tidal cycle is about 24 hours and 50 minutes, occasionally only three tides will be shown for a day. Data points are collected at 15-minute intervals. The data points are then reduced to a report format. Data information from twenty of the tide gages is transmitted to the California Data Exchange Center (CDEC) in Sacramento via GOES and can be viewed online. The following are the stations and the corresponding CDEC IDs and links telemeterd in the Delta.

Station Name

CDEC Link

Sacramento River at Rio Vista Bridge

RVB

San Joaquin River at Venice Island

VNI

Middle River at Howard Road Bridge

MHR

Doughty Cut above Grant Line Canal

DGL

Old River Barrier near DMC (above dam)

OAD

Old River Barrier near DMC (below dam)

OBD

Mokelumne River near Thornton

BEN

Yolo Bypass at Liberty Island

LIY

Yolo Bypass at Liberty Island (canal)

LIR

San Joaquin River at Antioch

ANH

Middle River at Tracy Road Bridge

MIB

Stockton Ship Channel at Burns Cut-off

RRI

Old River at Bacon Island

BAC

Old River at Tracy Road Bridge

OLD

San Joaquin River below Old River near Lathrop

SJL

Grant Line Canal at Tracy Road Bridge

GCT

Tom Paine Slough above Mouth

TPS

Tom Paine Slough above Intake Structure

TPI

Old River at Head

OHI

Old River at Coney Island

CIS

Tides in the Delta can also be affected by manmade structures or operations such as the pumping of the State Water Project and the Central Valley Project Pumping Plants, and the placement of temporary barriers in Old River, Middle River, and Grantline Canal. Tides are also affected on occasion by floodwaters from the Sacramento and San Joaquin Rivers. When the manmade and flood flow events influence the normal tidal patterns at nearby recorders, only the maximum and minimum daily gage heights are typically reported.

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