Current Work

• Construction to replace the existing two-lane Steveston Interchange with a new five-lane structure is underway.
• Current and upcoming work includes building the bridge deck and roadway approaches for the new Phase 1 structure.
• Construction activities, detours and large machinery are expected at the Steveston Interchange and Highway 99 intersection for the rest of 2024.

Highway 99 will be closed to traffic in both directions on the night of December 5 to pour a large section of the concrete deck on the north half of the new overpass.

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Construction of the new five-lane Steveston Interchange Project is progressing and will require paving and electrical work on Steveston Highway, west of the overpass.

Overnight work is scheduled to take place nightly between 10 p.m. and 5:30 a.m. beginning on December 1, 2024, until the morning of December 12.

Lane closures will be in place on Steveston Highway, and drivers can expect minor delays.

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Due to the ongoing construction of the new five-lane Steveston Interchange Project, changes to the bus stops on Steveston Highway will take place beginning November 25, 2024.

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On Wednesday, August 7, an overnight Highway 99 closure is required to move a heavy-lift crane across the highway. Vehicles travelling on Highway 99 will be detoured using the on- and off-ramps at Steveston Highway. The northbound loop ramp from Steveston Highway onto Highway 99 will be closed. Traffic will be rerouted to access the north side on-ramp.

The detour will be in place between 11 p.m. and 4:30 a.m. This overnight closure has been completed.

Following that, beginning August 8 and ending the morning of Saturday August 10, Highway 99 traffic will be reduced to a minimum of one lane in each direction overnight. The northbound loop ramp will also be closed with traffic rerouted on site to access the north side ramp. Lane reductions will resume beginning the evening of Monday August 12 and finish the morning of Saturday August 17.

Work will take place between 10 p.m. and 5 a.m.

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On Wednesday, August 7, an overnight Highway 99 closure is required to move a heavy-lift crane across the highway. Vehicles travelling on Highway 99 will be detoured using the on- and off-ramps at Steveston Highway. The northbound loop ramp from Steveston Highway onto Highway 99 will be closed. Traffic will be rerouted to access the north side on-ramp.

The detour will be in place between 11 p.m. and 4:30 a.m.

Following that, beginning August 8 and ending the morning of Sunday August 11, Highway 99 traffic will be reduced to a minimum of one lane in each direction overnight. The northbound loop ramp will also be closed with traffic rerouted on site to access the north side ramp.

Work will take place between 10 p.m. and 5 a.m.

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The work to complete the girder installation for stage one of the new Steveston Highway overpass will occur overnight, starting the evening of Tuesday, July 30, and concluding in the early morning of Friday, August 2.

As a result of this work, the eastbound to northbound loop ramp onto Highway 99 will be closed between 10 p.m. and 5 a.m. Traffic will be rerouted on site to access the northbound on-ramp.

In addition, a full Highway 99 closure is required to move heavy equipment across the highway overnight on Tuesday, July 30. Vehicles travelling on Highway 99 will be detoured using the on- and off-ramps at Steveston Highway.

To minimize traffic disruptions, the Highway 99 detour will only be in place between 11 p.m. and 4.30 a.m.

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