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:   September 28, 2012

 

Head of Old River (HOR) Barrier:

Construction of the Spring 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 were in the open position. Operation of the HOR barrier was concluded on May 31, 2012.  Removal of the barrier began on June 1, 2012, starting with the clay section and the concrete mats.  The barrier was breached on Monday, June 4, and removal of rock fill, culverts, and structures continue.  Full removal of the barrier occurred on June 21, and equipment was removed from the site on June 22, 2012.

The data collection period of the Head of Old River Fish Study is complete, the last juvenile Chinook Salmon release took place on May 27, 2012, and the HTI acoustic telemetry system was turned off on the morning of May 31, 2012.  All fish monitoring equipment was removed by May 31. The analysis of 2012 data, combined with the data collected over the past few years, will give insight into juvenile Chinook and predator behavior in the vicinity of the Head of Old River under differing hydrologic and barrier conditions.

DWR is currently consulting with the Department of Fish and Game to determine if the Fall Head of Old River Barrier will be installed this year to improve dissolved oxygen in the Stockton Deep Water Shipping Channel.  Based on dissolved oxygen as well as projected San Joaquin River Flow and the cooling weather trend DWR has recommended not installing the fall barrier.  DFG has tentatively agreed with DWR but is still reserved the right to request the fall barrier.  If the fall barrier is to be installed this year, a final decision needs to be made early next week.

 

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

Notching (flashboard removal at GLC) of the agricultural barriers was completed on September 14, 2012 to allow salmon passage.

Construction of the Middle River barrier began on March 12 and closure was obtained on March 16.  All flap gates are tidally operated. The center weir was raised by one foot on Tuesday July 3.

Construction of the Old River near Tracy barrier began on March 15, and closure and operation started on March 31. The boat ramp and portage is in full operation as of Wednesday, April 4. Demobilizing and site cleanup was completed on Friday April 6. As of July 11, all flap gates have been released to tidal operation. Six of nine culvert flap-gates were tied open on August 13 and released to tidal operation on August 17 at 1 PM.

The construction of the Grant Line Canal barrier is complete. Closure of the center weir portion of the barrier occurred on May 5, 2012.  DWR completed installation of the new flash board structure on June 14, 2012. Culvert flap gates were release to tidal operation on June 29. The boat ramp and portage is in full operation.

 

Environmental Permits Compliance Reporting:

Notching of the MR and ORT as well as flash board removal at GLC for adult salmon passage occurred on September 14, 2012. No concerns were observed.

Water Quality Monitoring:

Notching of the MR and ORT as well as flash board removal at GLC for adult salmon passage occurred on September 14, 2012. No concerns were observed.

Water Levels and Water Quality Notifications:

Staff continues to closely monitor South Delta water levels and quality. No problems were reported.

 

Modeling:

Modeling results are attached and forecasted minimum water levels are above target levels at all three stations, Middle River at Howard Road (MHR), Old River at Tracy Boulevard (OLD), and Grantline Canal at Doughty Cut (DGL).

Water levels for the forecast period are as follows:

MHR – Actual low water levels are approximating the modeled forecast.  Minimum model forecasted water levels will occur on October 10, 2012 at approximately 1.4 ft  (~ 1.1 ft above the target level of 0.3 ft.)
OLD – Actual low water levels are approximately 0.3 feet above the modeled forecast.  Minimum model forecasted water levels will occur on October 10, 2012 at approximately 1.3 ft  (~ 1.3 ft above the target level of 0.0 ft.)
DGL – Actual low water levels are approximating the modeled forecast.  Minimum model forecasted water levels will occur on October 10, 2012 at approximately 1.3 ft  (~ 1.3 ft above the target level of 0.0 ft.)

 

Real-time south Delta water level data is available on CDEC at the URL below:

http://cdec.water.ca.gov/river/southdeltaStages.html

 

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

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: jacobmc@water.ca.gov