Sierra Drive Stormwater Improvement Project

Last updated Dec. 19, 2018 - 4:06 pm
  • Planning
  • Design
  • Construction
  • Completed
  • Storm Drainage System
  • $1 million
  • Stormwater Management (Lead)
  • HDR, Inc.

Current Activity

Posted Wednesday, Dec. 19

Alternate analyses to determine and recommend solutions for the existing flooding and erosion issues at Sierra Drive are complete. Final design for Phase I of this project, conducted by HDR, Inc., is underway. The design is expected to be finished in the spring.


This project includes evaluating the existing storm drainage system capacity as well as investigating and choosing the best improvement alternatives to correct identified flooding and erosion issues.

The preliminary study was conducted in three phases:

  • Existing conditions analysis;
  • Alternatives evaluation/selection; and,
  • Conceptual (preliminary) plans.

The goal is to study, analyze, and implement project(s) to alleviate structure/public street flooding and erosion.


Project schedule with dates and descriptions
Fall 2012First public meeting held
Spring 2013Planning study complete and second public meeting held
Fall 2018Phase I design begins
Spring 2019Phase I design complete
Fall 2019Phase I construction begins
Fall 2020Phase I construction complete


The existing Sierra Drive stormwater drainage system includes a series of both open channel and drainage pipe conveyances. Various secondary drainage systems discharge to the primary piped storm sewer system located along Balboa Road toward Lawrence Drive. Outfall from the Balboa Road storm sewer drainage system is via an open channel until it discharges through a culvert underneath I-40.

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