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:   July 16, 2010

Head of Old River (HOR) Barrier:

The spring Head of Old River rock barrier was not installed this season.  Instead, as in 2009, a Non-Physical Barrier (NPB) was installed.  Installation began April 5 and was completed on April 15.  The operation of the NPB supported the VAMP fish study and includes a determination of the NPB’s effectiveness.  The salmon smolt monitoring was concluded on May 26 at the end of the VAMP and the NPB stayed in operation to benefit non-VAMP smolts through June 15th in compliance with our NMFS biological opinion.  The removal of the NPB started on June 16, the complete removal was finished June 18.

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

Construction of the MR barrier began on May 19.  Due to equipment problems, closure of the MR barrier was delayed to May 24. All flap-gates were untied on June 16 and the barrier is now fully operating.

Construction of the ORT barrier began on May 10 and the boat ramp was completed on May 13.  Closure of ORT barrier was achieved on June 3. All flap-gates were untied on June 16 and the barrier is now fully operating.

Installation of the GLC barrier began on June 16 and the boat ramp was completed on July 2nd.  Barrier closure was completed on July 7.  The barrier is now fully operating.

Water Levels/Water Quality Problem Notifications:

Nothing to report this week.

Modeling: 

Modeling results are attached.  Actual water levels are above the trigger levels (1.0 feet MSL at Old River and Grant Line Canal barriers, 0.3 feet MSL at Middle River barrier), and should remain that way through the modeled period. On June 15, the levels on Middle River dropped more than expected, likely due to increased agricultural diversions resulting from the recent high air temperatures.  The upcoming spring tide should raise levels well above the trigger.

Notes:  This will be the last TBP update from me.  Jacob McQuirk is the new Chief of the Temporary Barriers and Lower San Joaquin Section in the Bay-Delta Office.  Jacob will be sending updates in the future.  Jacob reports to me, so if you don’t like what he writes, call me.  Kidding.

These weekly updates are also available for your information on our website:
http://baydeltaoffice.water.ca.gov/sdb/tbp/index_tbp.cfm


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: (916) 601-6036 E-Mail: markho@water.ca.gov