ROHNERT PARK (KRON)—One person has been injured after a cement truck overturned Wednesday morning in Healdsburg.

It happened on Northbound 101 north of the Central Healdsburg on-ramp around 11:50 a.m.

The California Highway Patrol says it does not know at this time why the truck overturned blocking the number 1 lane.

The driver was trapped inside the truck.

The southbound #1 lane was closed while emergency crews tried to get him out.

The driver has been taken to the hospital. His condition is unknown at this time.

Lane number 1 on Northbound 101 is closed. Caltrans is estimating it will be closed until 6 p.m.

Stay with KRON 4 for updates on this developing story.