Chan​dworth Storm Drainage Improvement Project

  • Project typeStorm Water Services

The Sunnyvale/Chandworth Storm Drainage Improvement Project with a drainage area of 640 acres, was broken down into three smaller projects: Lilly Mill, Chandworth and Tattersall. 

The Chandworth Storm Drainage Improvement Project will replace failing infrastructure plus reduce street and structure flooding throughout the neighborhood. The project is located within a drainage area of approximately 200 acres. 

Project Updates

Storm drainage box culvert installation is underway working towards Rhodes Avenue. Rock breaking will continue as needed. Guardrail installation on Chandworth Road will begin late-January. View the January mailer(PDF, 364KB) for more information.


Estimated Cost: $11,100,000*

*includes all costs associated with this project such as planning and design, utility relocation, consultant fees, permits, construction, and landscaping.

Project Phase: Construction

Learn more about project phases.


End date
Planning Completed November 2013 
Design Completed June 2020
Permitting Completed September 2019
Property Easement/Acquisition Completed April 2019
Bid Completed December 2020
Construction In Progress Anticipated Mid 2023
Warranty TBD