Build NCC | Highway Improvements

Build NCC highway improvements includes extending the Carpool/High Occupancy Vehicle (HOV) 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/HOV 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 [email protected].

To receive construction alerts via text message, text BuildNCC to (760) 454-0077. 

Learn more about Build NCC:

Project Features

I-5 Carpool Lanes Rendering

I-5 Carpool/HOV Lanes

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

Status: Construction Completion: 2023

DevonshireStreet Devonshire Street Improvements

A neighborhood enhancement feature in Encinitas.

Status: Completed Completion: 2019

Highway Bridge Rendering

San Elijo Lagoon Highway Bridge

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

Status: Construction Completion: 2022

DevonshireStreet Sound Walls

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

Status: Construction Completion: 2023

I5 Visual Sim Manchester Avenue Multi-use Facility

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

Status: Construction Begins: late 2022

I-5Carpool DevonshireStreet SanElijoLagoon SoundWalls ManchesterAvenuePark BatiquitosLagoon
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Key Documents

Factsheet Factsheet