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Construction Update Oct. 10, 2023
Marin Water has completed repairs to an important access point on the Mount Tamalpais Watershed after historic winter rainfall caused a portion of Worn Spring Road to fail. The landslide took place on the south side of Worn Spring Road, about 400 feet from Phoenix Lake. Adjacent to the slide location, the District maintains an 18-inch welded steel water transmission main that supplies water to Ross Reservoir, a treated water reservoir that serves as the primary treated water storage facility for District customers in Ross Valley. Work to repair the rain-damaged roadway involved the installation of a 60-foot soldier pile retaining wall with concrete lagging, as well as a guardrail.
Road Closures and Other Impacts
Worn Spring Road will be closed three weeks before the start of construction, and throughout the duration of the 100-day construction window, which is scheduled to begin in August. Marin Water will notify residents in the immediate area of the planned work, which is expected to be complete in late October 2023.
Contact Information
Marin Water Construction Management team: 415-945-1560
| Project | Worn Spring Road Repairs |
| Program | A1E05 – Watershed – Road Repair and Improvements |
| Project Number | D23017 |
| Contact |
Zak Talbott |
Project Description
Installation of a new 60-foot soldier pile retaining wall with concrete lagging to stabilize Worn Spring Road which partially failed following storm events in January 2023. Worn Spring Road is the primary access route to Ross Reservoir and the existing 18-inch welded steel water transmission main that supplies water to Ross Reservoir is also located within this road. A guardrail will also be installed during the project.
Benefits
A winter storm on January 11th, 2023, caused a land slide on the outboard side of Worn Spring Road approximately 400 feet from Phoenix Lake. An 18-inch welded steel pipe transmission main is located on the inboard side of Worn Spring Road. This transmission main is critical for the conveyance of treated water from the District’s Bon Tempe Treatment Plant to Ross Reservoir and to the Ross Valley area. Ross Reservoir is the primary treated water storage facility for District customers in Ross Valley and maintaining the pipeline and equipment access to Ross Reservoir will ensure the District is able to provide a reliable source of water for customers within this region.
Schedule and Status
Planning: Winter 2023
Design: Spring 2023
Construction: Summer - Fall 2023
Expenditure Schedule
Actuals ThroughFY 23 |
FY 23Estimate |
Total |
$56,000 |
$234,000 |
$290,000 |
Funding Sources
Capital Maintenance Fund |
Other Funding Sources |
Total |
$339,000 |
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$339,000 |