Project Background
As part of its Water Infrastructure Improvement Program, LADWP will replace over 6 miles of an aged pipeline with 4 miles of a new, seismically resilient pipeline and 2 miles of welded steel pipe. The extensive replacement project, referred to as City Trunk Line North (CTLN) Unit 1 and Unit 2, will provide additional capacity, greater system flexibility, and enhanced reliability to customers in the San Fernando Valley.
The original Los Angeles City Trunk Line is a 72-inch steel pipeline used to transport large volumes of water throughout the Northeast San Fernando Valley area of Los Angeles. The pipeline was installed in 1914 and has experienced several leaks in the last 16 years.
California Environmental Quality Act (CEQA)
LADWP prepared an Initial Study/ Mitigated Negative Declaration (IS/ MND) to analyze the potential for impacts associated with the CTLN project. The IS/MND is available at www.ladwp.com/envnotices.
Project Scope
CTLN Unit 1 will be 4-miles of 54-inch Earthquake Resistant Ductile Iron Pipe (ERDIP), stretching LADWP’s Van Norman Complex in Sylmar (at Rinaldi Street) to the intersection of Arleta Avenue and Terra Bella Street in Arleta. ERDIP increases resiliency during seismic events since the joints are designed to resist separation by allowing for expansion and deflection. Unit 1 is a 7-year project from spring 2023 to spring 2030.
CTLN Unit 2 will be constructed of 54-inch welded steel pipe. This 2-mile section follows Arleta Avenue towards the Tujunga Wash. Unit 2 construction is from fall 2021 through summer 2028.
Most of the CTLN project will be installed using open trench construction and LADWP crews, with the exception of areas where a form of tunneling is necessary.
Project Schedule
| Description of Work | Status |
| Design | Complete |
| Public Notice of IS/MND Availability | January 10, 2019 |
| IS/MND Public Comment Period | January 10, 2019 through February 11, 2019 |
| MND Approval | Summer 2019 |
| Design Phase | 2018 - 2028 |
| Construction, Unit 1 | Spring 2023 to Winter 2030 |
| Current Work Areas (WA) | WA16 through June 2026 WA23 through Jan 2027 |
| Upcoming Work Areas | WA3 May 2026 to September 2026 |
| Completed Work Areas | WA 12, WA 13, WA 14, WA 17 |
| Future Work Areas | WA 1, WA 2, WA 4, WA 5, WA 6, WA 7, WA 8, WA 9, WA 10, WA 11, WA 15, WA 18, WA 19, WA 20, WA 21, WA 22, WA 24, WA 25 |
| Construction, Unit 2 | Fall 2021 to Summer 2028 |
| Current Work Area | WA9 Through July 2026 |
| Upcoming Work Areas | WA4 December 2026 to February 2026 |
| Completed Work Areas | WA 6, WA 7, WA 8, WA 9, WA 10, WA 11 |
| Future Work Areas | WA 1, WA 2, WA 3, WA 5 |
Traffic and Access
Construction will require temporary lane reductions and restrictions to street parking near the work area.
For work areas involving underground tunneling, there will be access pits on both sides of the intersection to accommodate the crew and materials. This will allow keeping some busy intersections open to traffic while the installation process continues.
Construction Information
- Monday – Friday, 7:00 AM to 4:30 PM
- Some Saturday and extended hours may be necessary.
- LADWP will provide advance notice to residences and businesses of changes to traffic and parking related to construction activities.
Contact Us
Community Liaison
Sandra Robles
213-367-1309
[email protected]
Project Manager
Susan Avila
213-367-4750
[email protected]