Steveston Interchange Project Overview
The Steveston Interchange Project is a key part of the Highway 99 Tunnel Program to improve travel along the Highway 99 corridor. As part of the broader program, the new five-lane Steveston Interchange improves connections for vehicles, transit users, pedestrians, and cyclists.
The modernized interchange provides more vehicle lanes, improved transit operations, and includes sidewalks and cycling lanes in both directions for the first time.
The project includes:
- Replacement of the existing two-lane interchange at Steveston Highway and Highway 99 with a five-lane structure. The new structure includes two eastbound lanes and three westbound lanes, including a left-turn lane onto Highway 99 southbound, to improve traffic flow.
- Improved ramp connections between Highway 99 and Steveston Highway to help with traffic flow and reduce queuing for vehicles.
- Transit-priority measures to allow buses to move through the interchange more efficiently, including signal priority at intersections, and a dedicated transit lane and in-lane bus stop in the northbound offramp.
- Sidewalks and separated bike lanes on both sides of the overpass to provide a safe path for pedestrians and cyclists travelling across Highway 99.
The new interchange is designed to improve travel time and reliability particularly at the northbound offramp from Highway 99 to Steveston Highway and for westbound through-traffic along Steveston Highway. Once the new tunnel is in place, travel time and reliability will be improved for traffic headed from Steveston Highway into the tunnel, further reducing traffic congestion at the Steveston Interchange.
Construction Photos
To see to full image library, please visit the Highway 99 Tunnel Program Flickr album.
Videos
- Project Cost: $87.5 million
- Schedule: Construction began in mid-2022. The Project opened to traffic in December 2025, with landscaping, final paving and site finishing activities scheduled through spring 2026.
If you have questions about construction, please email StevestonProject@flatironcorp.com or call the construction information phone line (24/7) at 1-888-270-1075.