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 3, 2015


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

The installation of the Old River near Tracy barrier started on March 16, 2015. The culvert frames have been backfilled, the underwater boat ramps are completed and the boat docks are in-placed. Closure took place today April 3, 2015. All culverts' flap gates will be released to tidal operation when the HORB is closed. A DWR boat tender will be on-site.

The installation of the Middle River barrier was started Friday March 27, 2015 and the weir was closed on March 31, 2015 with all culvert flap-gates tied open. All culverts' flap gates will be released to tidal operation today when the HORB is closed.

The construction of the Grant Line Canal barrier started on March 30, 2015 with the partial closure anticipated by April 13, 2015. As in the past, full closure of the Grant Line Canal will occur in early June after the approval from the fishery agencies once Delta smelt concerns have passed.

Head of Old River Barrier [HORB]:

The construction on the Spring Head of Old River barrier started on March 16, 2015. The closure took place today, April 3, 2015. Construction crews will block the channel and continue building the barrier in height, place concrete mats for the weir section, and install the clay plug. All 8 culvert slide gates are in the open position.

Environmental Permits Compliance Reporting:

Environmental staff conducted preconstruction surveys as required by State and Federal permits and Biological Opinions. An Environmental Tailgate Session was held at the Old River Tracy Barrier site to inform construction staff of the permit requirements, to give a general overview of sensitive species found at or near the construction sites and to instruct personnel on proper procedures to follow when sensitive species are encountered on the construction site. Additionally, an Environmental Compliance Monitor is on-site for all construction work, an approved Swainson's Hawk and nesting raptor monitor is conducting regular observations of nesting and territory sites. A water quality monitor is sampling for settleable solids and turbidity. As of today no exceedance to the water quality threshold has been observed.

Water Levels and Water Quality Notifications:

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


Computer modeling for water level form the period from 3-31-15 through 04-20-15 was performed, a copy of the modeling results is attached.

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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