Build NCC | Highway Improvements

Build NCC highway improvements includes extending the carpool lanes on Interstate 5 (I-5) from Lomas Santa Fe Drive in Solana Beach to State Route 78 (SR 78). Additionally, the highway bridge over the San Elijo Lagoon is being replaced with a wider and longer bridge to accommodate the carpool lanes and improve lagoon tidal flow. Eleven sound walls will be constructed on private property in Encinitas and Carlsbad during the first phase of highway improvements.

Some I-5 ramp and nighttime lane closures are anticipated. For the latest information on closures, view the closure list

Questions? Call our construction hotline at (844) NCC-0050 or email us at

To receive construction alerts via text message, text BuildNCC to 313131. 

Learn more about Build NCC:

Project Features

I-5 Carpool Lanes Rendering
I-5 Carpool Lanes

Addition of one carpool lane in each direction from Lomas Santa Fe Drive to SR 78.

Status: Construction Completion: 2022

DevonshireStreet Devonshire Street Improvements

A neighborhood enhancement feature in Encinitas.

Status: Construction Completed: 2019

Highway Bridge Rendering
San Elijo Lagoon Highway Bridge

Replacement of San Elijo Lagoon highway bridge to improve lagoon tidal flow.

Status: Construction Completion: 2021

DevonshireStreet Sound Walls

Addition of sound walls to improve residents’ quality of life.

Status: Construction Begins: 2019

I5 Visual Sim Manchester Avenue Park & Ride/Multi-use Facility

A facility to provide parking, bike lockers, EV charging stations, and access to San Elijo Lagoon.

Status: Construction Begins: 2020

I-5Carpool DevonshireStreet SanElijoLagoon SoundWalls ManchesterAvenuePark BatiquitosLagoon
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Key Documents

Factsheet Factsheet