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 11 , 2007Head of
The HOR barrier is closed with three culverts closed and three open. For now, we’re keeping three open to allow some downstream flow into
Agricultural Barriers (Old River near Tracy [ORT], Middle River [MR], Grant Line Canal [GLC]):
Barrier installations began April 2, 2007. The ORT and MR barriers are closed and culverts operating tidally. The GLC barrier closed on Thursday, May 10.
Modeling was completed this week and the results attached. The HOR barrier has three culverts open and three closed. Flap gates are operating tidally at the ORT, MR, and GLC barriers. Modeling assumed the GLC barrier would be closed May 9; however it was actually closed on May 10.
Fishery agencies and DWR will be closely monitoring conditions for Delta smelt which might effect operations of the barriers during April-May. Changes in flap-gate operations on the culverts, removal of the barriers, and changes to SWP/CVP export operations are all possible actions that could be taken to protect smelt if necessary.
These weekly updates are also available for your information on our NEW!!! website:
Please delete your old “favorite” for the Temporary Barriers Project and add this new site!
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Mark A. Holderman, P.E.
Chief, Temporary Barriers Project and
California Department of Water Resources
Phone: (916) 653-7429 FAX: (916) 653-6077
Cell/Pager: (916) 601-6036 E-Mail: email@example.com