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: May 25, 2012
As stipulated by court order, the Head of Old River, Middle River, and Old River Tracy Temporary Rock Barriers were 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 the open position. Crews completed construction of the clay weir section of the barrier on April 11, 2012. Operation of the HOR barrier will conclude on May 31, 2012.
The removal of the barrier will begin on the morning of May 31 following the removal of the fish monitoring equipment. The clay section and the concrete mats will first be removed on June 1, breaching of the barrier is scheduled for Monday, June 4.
The Head of Old River Fish Study is nearing completion, the last juvenile Chinook Salmon release will take place on May 27, 2012, and the HTI acoustic telemetry system will be turned off on the morning of May 31, 2012. To date data collection has proceeded as planned with only very minor interruptions. 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.
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 closure and operation started on March 31. All nine flap-gate culverts are tidally operated. The boat ramp and portage is in full operation as of Wednesday, April 4. Demobilizing and site cleanup was completed on Friday April 6.
The construction of the Grant Line Canal barrier is complete. Closure of the center weir portion of the barrier occurred on May 5, 2012. Culvert flap gates are tied open. The boat ramp and portage is in full operation. DWR will begin the re-installation of the flash board structure that was washed away during high river flows last year on May 30, 2012 prior to breaching the Head of Old River.
Environmental Permits Compliance Reporting:
No construction activities occurred this week. During construction environmental reporting information will be included.
Water Levels and Water Quality Notifications:
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 Doughty Cut (DGL).
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Jacob McQuirk, P.E.
Chief, Temporary Barriers Project and Lower San Joaquin
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: firstname.lastname@example.org