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:  Friday, July 21, 2006

Head of Old River Barrier (HORB):

The HORB was not installed this spring due to high flows.  The HORB will be installed in the fall if needed for dissolved oxygen improvements in the SJR and if requested by DFG. 

Agricultural Barriers (Old River near DMC, Middle River, Grant Line Canal):

The installation of the Middle River barrier began on July 5 and was completed on July 7.  The construction of the Old River near DMC and Grant Line Canal barriers started on July 7.  Closure of the DMC weir section was done on Monday (July 17) The GLC barrier closure occurred on Thursday (July 20).  Boat ramp work continues at both the DMC and GLC barrier sites although the boat tenders are able to portage boats across the ramp while finish and cleanup work is being done.


Modeling was completed late last week and today and the results attached.  Lower water levels have risen significantly since the DMC and GLC barriers were closed.  The forecasted water level plots show the increase beginning July 19 but this actually occurred on July 20. 

Modeling Outputs:

Middle River at Howard Road Bridge
Doughty Cut above GLC Barrier
Old River near Tracy Road Bridge


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!


Mark A. Holderman, 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) 653-7429  FAX: (916) 653-6077
Cell/Pager: (916) 601-6036 E-Mail: