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General Project Information:

The Fourth St Sewer project will improve the capacity of the City's sewage system by replacing 48-inch and 54-inch diameter sanitary sewer pipes with 4,500 feet of 84-inch diameter pipes along North street and approximately 300 feet of 72-inch diameter pipes along Commercial Street.

Fourth St is a busy San Jose roadway, with fronting residences and businesses, which will require extensive community outreach and complex traffic management. The project will cross under US 101, I-880, several large storm pipes and existing utilities, requiring permits to perform work within Caltrans' right of way.

The project will allow:

  • future shutdown and maintenance of City sewage systems

  • future decommissioning of deteriorated 60-inch brick sewer that runs parallel to Fourth Street, which was built in the 1890's

  • sewage flow from Commercial St to Old Bayshore Rd north of US 101

  • installation of a small diameter local collector sanitary sewer system

Project Map:




Construction Begins

Summer 2019

Tunneling Work (Under US 101)


Fourth St Pipe Replacement

Fall 2019 – Summer 2021

Pipe Laying Work (Under I-880)

Fall 2020 – Spring 2021

Commercial St Pipe Replacement

Winter 2021 – Fall 2021


Spring 2021 – Fall 2021

Project Completion

Fall 2021

Construction Hours:

Construction will take place Monday through Friday, 7:00am to 5:30pm. No work is anticipated on weekends, unless warranted. All construction dates and times are subject to change due to weather and unforeseen conditions.

Anticipated Project Impacts:

  • Shutdown of 1/4 City interceptors for maintenance/repair

  • Traffic will be temporarily impacted during construction along North Fourth Street

Construction Notice Archive:

Construction Update - October 2021

View file
nameFourth St Sewer_Construction Update_11.3.21.pdf

Construction Update - April 2021

View file
nameFourth St Sewer_Construction Update_4.28.21.pdf

Construction Update - August 2020

View file
nameFourth St Sewer_Construction Update_8.7.20.pdf

Construction Update - May 2020

View file
nameFourth St Sewer_Next Phase_Letter.pdf

Construction Update - November 25, 2019

View file
nameFourth St Sewer_Construction Update_11.25.19.pdf

Construction Update - November 8, 2019

View file
nameFourth St Sewer_Construction Update_11.8.19.pdf