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: October 2, 2015
Head of Old River (HOR) Barrier:
As a result of low flows in the San Joaquin River, the California Department of Fish and Wildlife has requested DWR install the Fall Head of Old River Barrier to maximize the effects of the attraction flows to support the returning adult salmonids into the tributaries and their respective spawning habitats. Construction of barrier started on Thursday September 3, 2015 with closure on September 14, 2015 and completion of the construction by placement of the chain-link fence around the barrier was achieved on September 17, 2015. DWR is currently working on the removal schedule for the fall head of Old River barrier and we will make it available upon finalization.
Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):
The Middle River and Old River near Tracy barriers were notched on Thursday September 08, 2015 to allow passage for migratory fish. The Grant Line Canal Barrier flash board structure is set in the wide open position. DWR is currently working on the removal schedule for the agricultural barriers and we will make it available upon finalization.
The Emergency Drought Barrier [EDB]:
Removal of the Emergency Drought Barrier started on September 8, 2015, breaching was achieved yesterday October 1, 2015 with the complete removal date set for November 15, 2015.
Environmental Permits Compliance Reporting:
Environmental staff has conducted pre-construction surveys as required by State and Federal permits and Biological Opinions. An Environmental Tailgate Session was held at the Head of Old River Barrier site to inform construction staff of the permit requirements, to give a general overview of sensitive species found at or near the construction site and to instruct personnel on proper procedures to follow when sensitive species are encountered on the construction site. Additionally, an Environmental Compliance Monitor was on-site for all construction work. A water quality monitoring and sampling for settleable solids and turbidity were conducted during the installation of the barrier and DWR will continue water quality monitoring during the operation of the barrier period.
Water Levels and Water Quality Notifications:
DWR will continue to monitor the water quality and water levels during the operation of the fall head of Old River barrier and at all agricultural barriers sites.
Thanks again to Reza of the Delta Compliance and Modeling Section for performing this week modeling run; the modeling period spanned from 10/01/2015 through 10/21/15. Forecasted water levels are well above the specified threshold in Middle River, Old River near Tracy and in Doughty Cut. Please note that the breaching of the drought barrier was taken into consideration and it was part of the modeling assumptions. A copy of the modeling results is attached.
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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