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:   March 25, 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 are tied open.
The installation of the Old River at Tracy barrier started on March 3, 2016.  Construction crew already installed the cat walk and the culverts,  all flap gates are tied in the open position, it is expected to close the ORT barrier by the end of the day today or by Monday of next week.
The construction crew will start working on the Grant Line Canal barrier as soon as they finish closing the ORT barrier scheduled for closure at the latest on Monday of next week.

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 is in the process of raising the barrier to the elevation specified in the improvement plans.  It is anticipated that the barrier will be closed by Tuesday or Wednesday of next week. 

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 were observed. DWR will continue to monitor the water quality and water levels before, during and after the installation of the temporary barriers.


Thanks to Reza of the Delta Compliance and Modeling Section, computer modeling for water level was performed. Modeling results are attached for the modeling period from 03-22-16 through 04-11-16.  Water level is above the concern elevation 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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