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: June 20, 2014
Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):
Temporary agricultural barrier installation of the Middle River started on March 11, 2014 and the weir section was closed on March 17, 2014. The culvert flap gates have been operating tidally as of April 8, 2014 and the weir section is planned to be raised on June 27, 2014. The installation of the Old River near Tracy barrier started on March 11, 2014. The weir section was closed on Thursday April 3, 2014 and the barrier construction was completed on Tuesday April 8, 2014. The culvert flap gates have been tidally operated as of April 8, 2014. The boat tender is on duty. The partial closure of the Grant Line Canal barrier was achieved on Friday March 28, 2014. Full closure of the weir section occurred on June 3, 2014. The culvert flap-gates have been tied open since closure but are planned to be released to tidal operation on June 27, 2014. The boat tender is on duty.
Head of Old River Barrier [HORB]:
The construction on the spring Head of Old River barrier began on Tuesday March 25, 2014. Closure was achieved on April 08, 2014. The barrier construction was completed on Friday April 11, 2014. All 8 slide gates were open during its entire spring operation. Construction removal of the barrier started on May 28, 2014 and breach of the weir section occurred on Monday June 9, 2014. Completion of the construction removal process is anticipated to occur on Friday June 20, 2014.
Summary of 2014 Temporary Barriers Culvert Operations:
Environmental Permits Compliance Reporting:
Staff continues with the Environmental Compliance Monitoring as scheduled. No incidental cases of listed species were observed.
Water Levels and Water Quality Notifications:
All three agricultural barriers (Middle River, Grantline Canal, and Old River near Tracy) are fully closed and the Head of Old River Barrier is in the process of being removed. DWR will continue to monitor water levels.
-Middle River barrier closed March 17th, 2014, all 6 culvert flap-gates tidally operated. Raising the barrier one foot is planned for June 27, 2014.
-Grantline Canal barrier was fully closed on June 3, 2014 with all 6 culvert flap-gates tied open. Releasing the culvert flap-gates to tidal operation is planned for June 27, 2104.
-Old River near Tracy barrier was closed on April 3rd, all 9 culvert flap-gates are tidally operated.
-Spring Head of Old River barrier was breached on June 9, 2014, and completion of the construction removal process is planned for June 20 , 2014.
Modeling results are attached and actual minimum water levels are above target levels at all three Ag barriers (Middle River, Grantline Canal, and Old River near Tracy) and should remain that way through the end of the forecast period.
Real-time south Delta water level data is available on CDEC at the URL below:
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Jacob McQuirk, P.E.
Temporary Barriers and Lower San Joaquin
1416 9th St., Room 215-23
Sacramento, CA 95814
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