Mission Trails to Lake Murray Pipeline Relining


Crane moves a pipe liner into a portal

Hot Off the Press

Construction is complete!

There is great news for those that live or work near Tierrasanta, San Carlos, and La Mesa – the project’s major construction activities are complete. The contractor finished the project two months ahead of schedule.

The last item that was completed was to restore water deliveries through the relined pipelines. This work occurred from May 5-11 near Lake Murray and the northwest portion of Mission Trails Regional Park. 

For more information, click this link to read the postcard that was mailed to residents and businesses along the construction route.

For more information, please see the "About This Project - Details" and "Map" sections below. 

Project in the News

Click "About This Project - Details" for links to media coverage of the project.

About This Project

The San Diego County Water Authority’s pipeline relining project rehabilitates and extends the life of its aging water delivery pipelines. The relining process involves inserting steel lining into the existing pipeline to reinforce it to help prevent water leaks and breaks. This helps ensure a safe and reliable water supply for our region’s future. 



In October 2008, Pipeline 4 failed in a fairly remote section of Mission Trails Regional Park, near the San Diego River. After the failure, the Water Authority performed forensic analysis on the pipe and determined that a short section of the pipe needed to be urgently relined with steel. Subsequently, from mid-February through mid-March 2009, the Water Authority relined approximately 1,200 feet of Pipeline 4 north and south of the San Diego River.


This relining project will reline the sections of Pipeline 4 that were not urgently relined. Generally, relining construction rehabilitates segments of pipelines based on their age and the need for improvements. The Mission Trails to Lake Murray Relining Project involves rehabilitating approximately 3 miles of Pipeline 4 beginning immediately south of State Route 52 in Mission Trails Regional Park east of the community of Tierrasanta and continues south to Lake Murray in the community of San Carlos. It also involves rehabilitating approximately a half-mile portion of Pipeline 3 along Lake Shore Drive, south of Jackson Drive, in the community of San Carlos and city of La Mesa.

The construction crews will conduct most of the work underground, inside the pipe, by establishing and entering the pipeline in 11 various sites or portals. Large wooden sound walls will be temporarily placed at portals, as needed, to adhere to environmental regulations and ease noise impacts to residents.



Project in the News

Click the links below to view news coverage of the project.

December 12, 2012 Media Event:
December 14, 2012 photo slideshow on utsandiego.com
December 13, 2012 article in Scoop San Diego
December 12, 2012 story on CBS 8
December 12, 2012 article on KPBS.com
December 12, 2012 story on NBC 7/39

July 25, 2012 Open House:
June 29, 2012 article in Mission Times Courier
July 25, 2012 article on KUSI.com
July 25, 2012 article on CBS8.com
July 25, 2012 article on 10NEWS.com
July 24, 2012 article on Fox 5 News

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Shutdown 3           May 5-11, 2013

*All dates, except shutdowns, are approximate and subject to change. Shutdowns may involve nighttime work.

Completed Milestones

Shutdown 2 January 13-19, 2013
Shutdown 1 October 21-30, 2012
Construction contract awarded June 28, 2012
Environmental documents (MND) and project approved                      January 27, 2011
Environmental documents (MND) released for public review/comment September 3, 2010  



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Project Portal Map (click to view larger image)

San Carlos Portal Map (click to view larger image)


Portal 5

Portal 6

Portal 7

Portal 8

Portal 9

Portal 11


Location of Construction Portals (Access Points)

Pipeline relining is conducted in several phases; using portals developed by removing 40-feet of existing pipe to gain access to the interior of the pipeline and to install relining materials. These 11 construction portals remain exposed but are gated and secured during construction. Not all portals are active at the same time, however. Work shifts from one portal to another depending on which phase is under way. The contractors usually work in a north to south pattern.


Portal 1

Inside Mission Trails Regional Park, south of state Route 52, east of Belsera condominiums (Tierrasanta)

Portals 2 - 4

Inside Mission Trails Regional Park

Portal 5

Within Jackson Dr., near Hemingway Dr.

Portal 6

Within Jackson Dr., near Tuxedo Rd.

Portal 7

Within Jackson Dr., near Park Ridge Blvd.

Portal 8

Within Jackson Dr., near Navajo Rd.

Portal 9

Within Jackson Dr., near Golfcrest Dr.

Portal 10

Within Lake Murray area, behind homes on Lake Shore Dr. and off Jackson Dr.

Portal 11

Within Lake Shore Dr., near Baltimore Dr.


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Pipe liner ready to be installed 

Inside the pipe - new liner is smaller in diameter than existing pipe

For general relining project photos, click here




To watch this pipeline relining overview video in YouTube, click here. To see news coverage of past relining projects, click here.



There are no additional Multimedia items for this project.


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Community Presentations

The Water Authority is committed to keeping all community groups and organizations in the project area informed about the project. Water Authority staff has made and will continue to make periodic project update presentations to the following organizations and groups:

• San Carlos Area Council 
• Tierrasanta Community Council
• Mission Trails Regional Park Citizens Advisory Committee
• Mission Trails Regional Park Task Force
• Navajo Community Planners, Inc.
• Belsera Homeowners Association
• Woodland Hills Condominium Association
• San Diego Mountain Biking Association

If your group or organization would like a project update presentation, please contact us at (877) 682-9283, Ext. 7004 or e-mail us at CIPinfo@sdcwa.org . Please include your organization’s name and contact information as well as date/time of presentation requested.

Information Updates:
August 1, 2012: San Carlos Area Council
July 25, 2012: Community Open House (5-7 p.m.)
May 21, 2012: Navajo Community Planners, Inc.
May 2, 2012: San Carlos Area Council

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Click here to view the report and other environmental documents for this project.


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For more information, please call the 24-hour toll-free project information line at (877) 682-9283, ext. 7005 or email CIPinfo@sdcwa.org. A representative from the project team will return your inquiry within one business day.


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