​Lilly ​Mill Storm Drainage Improvement Project

Project is in the warranty phase.

​Latest ​News


​Construction is complete. We will continue to monitor the project during the next 12 months as part of the warranty phase. Please view the April mailer for more information. 


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 Lilly Mill Storm Drainage Improvement Project will reduce street and structure flooding throughout the neighborhood and address stream erosion to provide a more natural, stable stream system.  Located within a drainage area of approximately 100 acres, the project will replace and/or rehabilitate aging infrastructure and provide adequate drainage system capacity.

Estimated Cost: $11,800,000​*

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

The project team will manage the project through several phases. Specific work is conducted during each phase and public involvement is emphasized throughout the process. Learn more about project phases.


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PlanningCOMPLETEDJanuary 2013
DesignCOMPLETEDJuly 2018
PermittingCOMPLETEDJuly 2018
Property Easement/AcquisitionCOMPLETEDDecember 2016
ConstructionCOMPLETEDMarch 2021
WarrantyCOMPLETEDMarch 2022

​Proje​ct Team

Jimmy Knight

Construction Inspector

Edrina​ Maben-Collins

Senior Construction Inspector

Adam Clapp

Construction Supervisor

Jackie Deal, PE

Senior ​Project Manager



Lilly Mill April 2021 Mailer.pdfLilly Mill April 2021 Mailer
Lilly Mill May 2020 Mailer.pdfLilly Mill May 2020 Mailer
Lilly Mill March 2020 Mailer.pdfLilly Mill March 2020 Mailer
Lilly Mill July 2019 Mailer.pdfLilly Mill July 2019 Mailer
Lilly Mill November 2018 Mailer.pdfLilly Mill November 2018 Mailer
Lilly Mill May 2018 Mailer.pdfLilly Mill May 2018 Mailer
Lilly Mill March 2018 Mailer.pdfLilly Mill March 2018 Mailer
Lilly Mill January 2017 Mailer.pdfLilly Mill January 2017 Mailer
Lilly Mill June 2016 Mailer.pdfLilly Mill June 2016 Mailer
Lilly Mill November 2015 Mailer.pdfLilly Mill November 2015 Mailer
Lilly Mill July 2015 Mailer.pdfLilly Mill July 2015 Mailer
Lilly Mill March 2015 Mailer.pdfLilly Mill March 2015 Mailer
Lilly Mill November 2014 Mailer.pdfLilly Mill November 2014 Mailer
Lilly Mill July 2014 Mailer.pdfLilly Mill July 2014 Mailer
Lilly Mill June 12 2014 Public Meeting Presentation.pdfLilly Mill June 12 2014 Public Meeting Presentation
Lilly Mill June 12 2014 Public Meeting Minutes.pdfLilly Mill June 12 2014 Public Meeting Minutes
Lilly Mill May 2014 Mailer.pdfLilly Mill May 2014 Mailer
Lilly Mill March 2014 Mailer.pdfLilly Mill March 2014 Mailer
Lilly Mill November 2013 Mailer.pdfLilly Mill November 2013 Mailer