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 2, 2012

As stipulated by court order, the Temporary Rock Barriers are being installed approximately two weeks early.  The early closure of the Head of Old River Rock barrier is intended to benefit out-migrating juvenile Chinook salmon and steelhead.

Head of Old River (HOR) Barrier:

Construction of the Head of Old River barrier began on March 15, 2012. Barrier closure and operation were achieved at noon on April 1, all eight slide-gate culverts are in open position. Crews will complete the barrier emergency breach section with clay backfill on Thursday and start demobilizing on Saturday. 

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

Construction of the Middle River barrier began on March 12 and closure was obtained on March 16.  All flap gates are tidally operated.

Construction of the Old River near Tracy barrier began on March 15 and boat ramp construction is underway.  Barrier closure and operation were achieved at 5:00 p.m. on March 31, all nine flap-gate culverts are tidally operated.  A 15 feet by 5 feet notch is provided for boat passage until the boat ramp is in full operation on Wednesday, April 4. Demobilizing and site cleanup will begin on Friday.

The site work preparation for the Grant Line Canal barrier continues this week, in-water work is anticipated to begin on April 9, 2012.


Water Levels/Water Quality/Sound Monitoring Problem Notifications:

No problems reported.



Modeling simulation will begin this week.

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

If you know of anyone else that should be receiving this update, please let me know by email, and I'll add them to the mailing list.  Thanks!

Jacob McQuirk, P.E.
Chief, Temporary Barriers Project and Lower San Joaquin
Bay-Delta Office
California Department of Water Resources
1416 9th St., P.O. Box 942836
Sacramento, CA 94236-0001
Phone: (916) 653-9883  FAX: (916) 653-6077
Cell: (916) 425-6857 E-Mail: