Calleguas Water District to Relocate Water Supply Pipeline in Thousand Oaks

Calleguas MWD to Relocate Vital Water Supply Pipeline in Thousand Oaks

On January 3, the Calleguas Municipal Water District (Calleguas) will begin construction activities to relocate a 48-inch diameter pipeline that provides water service to much of the Thousand Oaks area. Originally installed in 1965, the Conejo Valley Feeder delivers water to residents and businesses in the central and western portions of the valley.

Under the $1.4 million project, Calleguas will construct 500 feet of pipe within a new steel casing paralleling the existing pipeline along Olsen Road under the State Highway 23 bridge. In recent years, the California Department of Transportation made seismic related improvements to the highway bridge. The location of these improvements on top of Calleguas’ pipeline require that a segment of pipe be relocated to ensure continued water supply reliability and public safety.

During construction, vehicular traffic will be constrained in both directions to allow construction crews adequate space to install the new pipe and connect it with the existing pipeline beyond the bridge’s support columns. The left of the two eastbound lanes will be closed for the duration of the project, scheduled for completion by May 2011. The right eastbound lane will remain open and be modified to allow vehicles to either continue along Olsen Road to Simi Valley or access the northbound highway onramp. The left westbound lane on Olsen Road will also be closed between 9 a.m. and 7 p.m. daily. Project updates will be posted to Calleguas’ web site at

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“Maintaining flow through this regional supply pipeline is essential for reliable water service to literally tens of thousands of water users in the area,” said Susan Mulligan, Calleguas General Manager. “We are working closely with Caltrans and the City of Thousand Oaks to design a traffic control plan that minimizes impacts on local commuters while enabling our contractor adequate space to work. We apologize for any inconvenience for area residents and are committed to completing the project as
quickly as possible.”

Calleguas is one of twenty-six member agencies of the Metropolitan Water District of Southern California and the primary urban water supplier in Ventura County, providing water service to a population of over 600,000. Through a variety retail water agencies and companies, Calleguas provides water to the cities of Oxnard, Camarillo, Moorpark, Simi Valley, Thousand Oaks, and Port Hueneme as well as surrounding unincorporated areas.