Phoenix Lake Pipeline Replacement Project

The Phoenix Lake Road Pipeline Seismic Reliability Project – one of the projects identified as part of the Fire Flow Master Plan Integrated System Reliability Study – starts in June and will involve the installation of a new water transmission line that serves central and southern Marin. The existing pipeline dates back to around 1880 (prior to MMWD’s formation in 1912). Some popular roads and trails in the vicinity of Phoenix Lake will be closed to the public for the duration of that project, which is approximately five months.

The project is on track to meet the scheduled completion date of November 12.

We appreciate your patience and understanding as we undertake this important infrastructure project.

Watershed visitors: Thank you for staying out of closed areas. The reason for the closures is safety, including yours. We will continue to review the closure plans as the project progresses and will make any adjustments accordingly. 

Click here for a map of the roads and trails that will be restricted to public access during construction.

During the weeks of August 23 and August 30:

• The contractor is cleaning up the site. The pipe has been installed and all connections mortared. Review of the video of the inside of the pipe and submittal is in process.
• Next week any final work to be performed inside the pipe will occur, and then the pipes will be flushed and disinfected.
• All trails remain closed for public safety.

During the week of August 16:

• The contractor will be working inside the pipe to apply mortar to the pipe joints and will be working on appurtenances.

During the week of August 2:

• Mainline pipe installation will be complete this week. Appurtenant work such as installation of pipe drains and air release valves will begin.

During the week of July 19:

• The contractor will continue to install pipe, trench ahead of pipe installation and cut weeds along the pipeline alignment.
• Trails remain closed.
• During the week of July 12, the contractor installed 1,836 feet of pipe out of the total 3,600 total feet to be installed.

During the week of July 12:

• The contractor will continue mainline pipe installation. During the week of July 5, the contractor installed 800 feet of pipe out of the total 3,600 feet to be installed.
• Trails remain closed.

During the week of July 5:

• The contractor will begin welding pipe sections together, excavating a pipe trench and installing pipe.

During the week of June 28:

• Demobilize tree removal equipment.
• Relocate power pole.
• Procure materials and deliver to the site.

During the week of June 21:

• Tree removal is scheduled to begin Monday, June 21 or Tuesday, June 22.

• Excavation work is on hold until fittings arrive and culvert issues settled.

During the week of June 14:

• The contractor will begin tree removal, moving equipment and pipe to the work site and installing work limit fencing. The contractor expects to move pipe and other materials to the project site until approximately June 28.
• District watershed staff will begin trail closures in the surrounding area. Trail closure maps are posted at trail heads and available for downloading above.