Abstract: An adjustable dockboard for bridging the gap between a loading dock and a carrier, the dockboard including a ramp member hingedly connected to the loading dock and biased to an elevated position, and a tread plate assembly positioned in the ramp member and movable to an extended position to engage the bed of a carrier when the ramp member is lowered, the tread plate assembly being locked into a set position on engagement with the bed of the carrier, the tread plate assembly being removeable from the carrier for repair and maintenance and the ramp member being seated in the dockboard by its own weight.