The following report on the Temporary Barriers Project is for your information and action, as appropriate.  This report will be transmitted whenever changes occur to the operation of the barriers, and as a result of modeling and/or field monitoring of water levels in the south Delta.

STATUS AS OF:  April 1, 2016

Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):

The installation of the Middle River barrier started on March 2, 2016 and the weir was closed on March 9, 2016 at 11:30 am.  Construction completed on March 10, 2016.  All flap gates will be tidally operating today April 1, 2016  immediately after the closing the head of Old River barrier.
The installation of the Old River at Tracy barrier started on March 3, 2016.  Construction crew closed the barrier on Friday March 25, 2016.  Today April 1, 2016 the flap gates will be untied to resume tidal operation immediately after the closing the head of Old River barrier.
The construction crew started working on the Grant Line Canal barrier last Monday March 28, 2016, crew is working on the installation barrier’s abutment at the north levee .

Head of Old River Barrier [HORB]:

The construction on the Spring Head of Old River barrier started on March 10, 2016 at 7am.  The construction crew will close the head of Old River barrier today April 1, 2016.  All slide gates will be left in the open position in compliance with the environmental permits.

Environmental Permits Compliance Reporting:

Environmental staff conducted pre-construction surveys as required by State and Federal permits and Biological Opinions. A water quality monitoring and sampling for settleable solids and turbidity was conducted during the installation of the barriers and it will continue for the reminder of the operation period of the barriers.

Water Levels and Water Quality Notifications:

No exceedance of the water quality turbidity measurements during the installation of the ORT and the HORB were observed. DWR will continue to monitor the water quality and water levels before, during, and after the installation of the temporary barriers.


Thanks again to Reza of the Delta Compliance and Modeling Section, computer modeling for water level was performed. A copy of the modeling results is attached for the modeling period from 03-29-16 through 04-18-16.  Water level is above the concern levels at all designated monitoring stations.

Real-time south Delta water level data is available on CDEC at the URL below: 

These weekly updates are also available for your information on our website:

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Thank you!
Jacob McQuirk, P.E.
DWR|Bay-Delta Office
Temporary Barriers and Lower San Joaquin
1416 9th St., Room 215-23
Sacramento, CA 95814
office:   916-653-9883
Fax:      916-653-6077


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