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A1: Main Ave and Madrone Pipelines Restoration

This project will restore the Main Avenue and Madrone pipelines to full operating capacity of 37 cubic feet per second from Anderson Reservoir. The upgrade includes replacement of a 1-mile section of pipe on the Main Avenue line which has been out of service since 1994, and restoration of approximately 1.25 miles of Madrone pipeline which has restricted capacity due to root intrusion and deterioration.


  • Increases groundwater recharge by about 2,000 acre-feet per year in South County’s Llagas Groundwater Sub-basin, a sufficient water supply for 4,000 families of five
  • Improves operational flexibility
  • Maximizes the delivery of imported water to treatment plants supplying drinking water to North County
  • Saves energy, reduces operating costs, and cuts CO2 emissions by reducing dependence on Coyote Pumping Plant

Project Status, Main & Madrone Pipeline Restoration Project

(As of October 2016)

  • The project's planning phase is complete and its findings summarized in the Planning Study Report (PDF).
  • The project’s 90% design documents have been initiated and are scheduled to be complete in December 2016.

Key Performance Indicators

  1. Restore transmission pipelines to full operating capacity of 37 cubic feet per second from Anderson Reservoir
  2. Restore ability to deliver 20 cubic feet per second to Madrone Channel

Priority A 200


Project Information

Project Start FY 2015
Project Finish FY 2018
Safe Clean Water
Program funding

$16.1 M**

(2015 Dollars)

**More financial information: 5-Year Implementation Plan, pages: 19-27
Status Design

For information, contact: