sierra drive drainage


Sierra Drive Stormwater Improvement Project

Stormwater System Upgrade

We replaced a storm drainage pipe and culvert on Sierra Drive and Balboa Road to reduce flooding and erosion. The project was performed in two phases in order to minimize disruptions to the neighborhood traffic. Phase I focused on downstream improvements and Phase II focused on upstream improvements.

Project Details

$2 million
Project Lead:
Stormwater Management
HDR, Inc. (Design); Carolina Civilworks Inc. (Construction)



Gilles Bellot, PE
Senior Project Manager

Lead Department:
Engineering Services
Service Unit:




The Study

The preliminary study was done in three phases:

  • Looking at the condition;
  • Determining alternatives; and,
  • Working on the preliminary plan. 

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

Lead Department:
Engineering Services


This phase is complete. 


Lead Department:
Engineering Services

Right of Way Acquisition

We completed the pre-construction phase. We have: 

  • Routed and finalized the construction contract; and, 
  • Received required permits and easement acquisitions for the project.
Lead Department:
Engineering Services


Phase I and II of construction has been completed on Sierra Drive and Balboa Road. Both roads are open to thru traffic.

Lead Department:
Engineering Services


We completed improvements located on Sierra Drive, Balboa Road, and Lawerence Drive. We upsized the existing culvert, added a new box culvert, concrete pipes, and additional catch basins in order to help reduce street flooding.

Lead Department:
Engineering Services

Completed construction of Sierra Drive Stormwater Pipe

Completed construction of Sierra Drive Stormwater Pipe.


Date Activity
Fall 2012 First public meeting held
Spring 2013 Planning study complete and second public meeting held
Fall 2018 Design Phase Begins
Winter 2022 Design and Right of Way Acquisition complete
Winter 2023 Phase I Construction Begins
Summer 2023 Phase II Construction Begins
Summer 2023 Construction Completed