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 24, 2014
Modeling of potential changes in barrier culvert flap gate operations is being conducted with the intent of improving water quality. If modeling shows potential water quality improvements, DWR will provide notification on the culvert flap gate operational changes prior to implementing. Close monitoring of changes in water level and quality conditions will be conducted if flap gates are tied open.
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 was raised on June 26, 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 were released to tidal operation on June 25, 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. The construction removal/demobilization process was completed on Thursday June 25, 2014.
Summary of 2014 Temporary Barriers Culvert Operations
Environmental Permits Compliance Reporting:
Staff completed the environmental compliance monitoring on June 26, 2014 when construction was completed on the Middle River barrier raise. The terms of all environmental permits have been met, and compliance monitoring will continue when barrier removal commences this fall.
Water Levels and Water Quality Notifications:
All three agricultural barriers (Middle River, Grantline Canal, and Old River near Tracy) are fully closed and the Spring Head of Old River Barrier has been removed. DWR continues to monitor water levels.
Modeling results for the July 15 to August 5, 2014 period 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:
These weekly updates are also available for your information on our website:
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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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