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: April 9, 2012
As stipulated by court order, the Temporary Rock Barriers are being 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 open position. Crews will resume construction and completion of the clay weir section of the barrier this week.
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 was achieved at 5:00 p.m. 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 underway. Crew will complete about 2/3 of the barrier and leave the center weir portion open until early June. Operation of the barrier will begin with approval from USFWS after delta smelt concerns have passed.
Water Levels/Water Quality/Sound Monitoring Problem Notifications:
In compliance with the 401 Certification, staff performs daily surface water sampling at the Grant Line Canal site during construction. No violation of the conditions is reported.
Modeling results are attached and forecasted minimum water levels are above target levels at Middle River at Howard Road (MHR) and Old River at Tracy Boulevard (OLD) stations. Water levels are below target levels at Doughty Cut (DGL) station.
Water levels for the forecast period are as follows:
MHR – Actual water levels are slightly above the forecast. Minimum forecasted water levels will occur on April 15, 2012 at approximately 0.8 ft (~ 0.5ft above the target level of 0.3 ft.)
OLD – Actual water levels have ranged to as much as 0.5 ft below the model forecast water levels. Minimum forecasted water levels will occur on April 15, 2012 at approximately 0.5 ft (~ 0.5ft above the target level of 0.0 ft.)
DGL – Actual water levels have ranged to as much as 0.5 ft below the model forecast water levels. Minimum forecasted water levels will occur on April 15, 2012 at approximately -0.4 ft (~ 0.4ft below the target level of 0.0 ft.)
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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